Brake discs get hot after replacing pads - what to do?

The brake disc gets hot after replacing the pads: possible causes and repair methods:

Keeping the brake system in good condition is a priority for any car owner. All consumables should be changed on time. These include pads. A common situation is that the brake disc heats up after replacing the pads. Let's try to find out why this happens and how to fix it.

Types of brake discs

There are several types of them. Discs differ in the material they are made of. The element can be made of cast iron, steel, cermet or carbon fiber. The last two types are highly expensive, and therefore are not used on most production cars. Should brake discs heat up during operation? Yes, they should warm up.

During braking, the pads clamp the disc on both sides. Due to the increase in friction force, the speed of the car decreases, and eventually the car stops. The kinetic energy arising at this moment is wasted to overcome friction and then turns into thermal energy. As a result, the disc and pads heat up.

You need to understand that this is a completely normal phenomenon. But the heating should not be excessive. It is not the process itself that is important, but the deformation of the disc after it. During prolonged braking (for example, on mountain serpentines), the system components can overheat greatly, which can cause warping and then beating when pressing the pedal.

If you drive into a puddle with an overheated disk, then due to sudden temperature changes the metal may completely crack.

Metal ceramics and carbon fiber can heat up to 1200-1400 degrees, and this is quite normal for these materials. The coefficient of friction is higher here, but these materials are not so susceptible to thermal deformation. For metal disks, the maximum heating temperature is 500-600 degrees. Overheating will lead to loss of geometric characteristics.

The main reasons for overheating of brake discs

Among the main reasons are jamming brake caliper guides. In this case, the pad cannot evenly clamp the working surface of the disc.

Also, the latter can heat up due to deformation - the block presses unevenly on the working plane. Another reason is natural wear of the pads.

Also, different brakes on the front and rear axles lead to overheating.

Problems with new pads

It often happens that a driver changes worn parts, but after replacing the pads the brake disc gets hot. At the same time, the car owner does not resort to frequent emergency braking. Let's look at typical reasons.

Brake fluid

On older cars, the system was mechanically driven. Over time, manufacturers began to equip cars with more advanced systems. Nowadays hydraulics are used to drive the brakes. The use of such a drive made it possible to reduce the efforts that must be made to reduce speed.

At the same time, the braking process itself has become more efficient due to the use of brake fluid. It moves along the lines and puts pressure on the working cylinders, creating the necessary force to press the pads. Like all technical fluids, brake fluids have their own lifespan. Few people know about this, but it is true.

And the operation of the cylinders in the caliper depends on the condition and characteristics of this fluid.

Automotive service experts recommend changing brake fluid once every two years. Why exactly this period? It's all about hygroscopicity.

The fluid absorbs moisture, and the latter destroys parts of the brake system. Due to corrosion, the brake system piston cannot effectively press the pads.

Situations often occur when the pistons jam in any one position.

The pad will constantly touch the disc. As a result, the latter will heat up. This is why brake discs get hot after replacing the pads. Old, erased elements did not reach the surface of the disk. And the new ones have a thicker friction lining. Hence the friction.

What is the repair method? The situation can be corrected by regularly replacing the brake fluid. This will avoid corrosion in the lines and system elements.

Electronics

This happens rarely, but it does happen. On many cars with ABS (in particular, on Toyota), the brake discs heat up after replacing the pads due to a “glitch” of the anti-lock braking system sensors. It is recommended to check the system for serviceability.

Human factor

Every year the weight of cars increases, and the power of the power unit also increases. Car owners put pressure on the accelerator and do not think about how the system functions. But all you need to do is remember the physics course at school. If the resistance increases, the friction force also increases. The same applies to brake discs.

To reduce speed on a car weighing 1.5 tons, it is necessary to apply a large compression force to the pads. The temperature of the disc increases, and if you add to this an aggressive driving style, the heating is easy to explain. Do not put too much stress on the brake system by frequently pressing the pedal. This will not have the best effect on the life of the pads and disc.

This is especially true for budget class cars with small calipers.

Stopping support

If the brake discs get very hot after replacing the pads, then you should carefully examine this element. The caliper may simply jam. In this case, the pad will not evenly adhere to the surface of the disc. Due to this, the friction coefficient increases.

You should also make sure that the caliper guides are well lubricated. If there is no lubricant, it is necessary to treat each guide and the entire caliper mechanism with it. When driving a car with worn brake pads, the system piston may come out of the cylinder higher than normal.

The mirror in the place where the piston should be will oxidize or become damaged. Once new pads are installed, the element will not return to its normal position. This problem can be solved by replacing the caliper repair kit. It is also recommended to check the condition of the anthers.

If cracks appear in them, they should be replaced. Dust and dirt are one of the reasons for a stuck caliper.

Poor quality pads or inappropriate materials

Very often the brake disc heats up after replacing the pads due to the fact that the car owner decided to save money. The cheap pads sold in most stores are not of high quality. Hence the heating.

Europe has abandoned asbestos in the production of friction linings. But in Russia such goods are still found. Asbestos negatively affects the operation of the system. There is only one way out - replacing the pads with original ones.

Disk Status

If the disc heats up after replacing the pads, the reasons for this phenomenon may be related to the disc itself. The latter has a shoulder on the working surface.

Where does it come from? It was wiped by the old pads, and after installing the new ones, they rub against this shoulder. This is the reason. Repair method: grooving the brake disc.

But it is done when the residual thickness of the element is not lower than normal and there are no cracks on the surface.

Vacuum booster

If the disc heats up after replacing the pads, you can also check the vacuum booster. It happens that when the engine is running, it itself slows down the wheels. This can be diagnosed by disconnecting the hose from the amplifier. It is recommended to replace a faulty vacuum seal.

Rear discs overheating

Here among the reasons everything is the same as for the front ones. These are problems in the caliper and brake cylinders.

But it also happens that the front brakes for some reason have lost their effectiveness, and the bulk of the effort goes to the rear. This can happen not only after replacing the pads. The rear brake discs also get hot on old parts.

What to do in this case? The brake force regulator needs to be replaced. In common parlance he is called a “sorcerer”.

Rules for rolling in new pads

After replacing them at car repair shops, mechanics often forget or simply do not tell clients about the rules for operating a car with new pads. For approximately 200-300 kilometers, it is recommended to avoid emergency and extreme reduction in speed.

During this period, the friction lining rubs against the surface of the disc. Immediately after replacement, braking efficiency decreases. The driver presses the pedal harder. This is the reason why the front brake discs heat up after replacing the pads.

But with “grinding in” the problem goes away by itself.

Conclusion

A properly functioning braking system is the key to your safety. If it is faulty, action must be taken immediately. The consequences of disk overheating can be disastrous.

After replacing the pads, they need to be rolled in. It is better to choose new consumables from trusted manufacturers. You also need to monitor the condition of the disks.

If sometimes the brake discs get very hot after replacement, this is a reason to contact a specialist.

Source: https://www.syl.ru/article/351032/greetsya-tormoznoy-disk-posle-zamenyi-kolodok-vozmojnyie-prichinyi-i-sposobyi-remonta

Why do the front brake discs get hot - we identify the reasons + video

Why do the front brake discs get hot even though they have recently been inspected or repaired? How to regulate the condition of these parts and what are the consequences of not paying attention to them? Most novice car enthusiasts ask these questions, and in this article we will give answers to them.

What system are we talking about?

Today, the braking system is quite effective thanks to the use of discs.

They are a fairly significant element in this system, which means they are responsible for your safety.

A disc brake operates using a clamping mechanism that includes pads. Brake pads are coated with a friction material, and when braking, they create friction with the disc.

With the help of this simple mechanism the car slows down. Brake discs are most often made of cast iron because it has low production costs and excellent friction properties. For sports cars, in order to reduce their weight and increase braking efficiency, discs made of ceramic and carbon fiber (carbon fiber) are used.

Why do the discs get hot after replacing brake pads?

You can determine that the discs are heating up by several indicators, for example, an unpleasant sound is heard from under the wheels, fuel consumption increases, and brake pads wear out much faster. A particularly common situation is when the discs become hot after replacing the brake pads.

To combat this, you need to check and lubricate the cylinders every time you replace the brake pads, and also look at the caliper guides.

After all, any intervention in the system with fine tuning leads to some imbalance of the mechanism, which means that after replacement everything should be adjusted again.

The most dangerous thing when heating cast iron brake discs is the fact that if water gets on a hot disc, it can become covered with a network of cracks, and in some cases even crumble.

At high temperatures, warping occurs (the surface ceases to be smooth, the gaps increase in various places where the disk comes into contact with other parts).

Even if everything is fine with heating, you still need to periodically monitor the braking system, because this mechanism is responsible for driving safety (like the steering).

Why do the front brake discs get hot - the human factor

Of course, the main reason for disk overheating is friction. The brake system instantly heats up and does not have time to cool down, especially in the city when driving during rush hour.

In such cases, you should take this problem seriously and try to make as little sudden starts and emergency braking as possible.

You need to brake more smoothly, especially in our time when cars have become much more powerful and heavier.

The weight of the car plays a big role when braking. For a car with a large mass, you need to use wheels with a large diameter, especially for crossovers and SUVs. Driving style also plays an important role.

The more aggressively you drive the car, the hotter the brakes become, and this is entirely up to the driver..

But these are all human factors that can cause temperature instability even in a working system, and there are also mechanical features.

Mechanical causes of disk heating

The malfunction of the brakes, or rather such an inconvenient defect as an increase in temperature, may also depend on individual parts of the brake system: the quality and quantity of the brake fluid (BF), the thickness of the brake pads and the condition of the surface of the disc itself. The amount of fuel fluid can be checked by the level in the barrel, which is usually located on the right under the hood. Its level must be between the minimum and maximum marks.

The thickness of the pads is regulated in the documentation for the car, in fact, as is the thickness of the discs.

It is believed that even a few millimeters below the norm puts you at risk, firstly, this makes it easier for the disc to change its shape when heated, and secondly, it can simply burst at the moment of sudden braking.

Overheating naturally becomes more significant and occurs faster when the thickness of the metal decreases. And the imperfection of the surface, i.e. various irregularities also increase the likelihood of overheating due to increased friction in places of defects.

You can avoid heating by replacing standard disks with ventilated ones. The ventilated version is a little more complicated than the usual one, but due to its design it cools faster.

A disc brake of this kind consists of two plates approximately 5 millimeters thick, between which there are special air channels.

Also, as mentioned earlier, a lot of heating can be avoided by driving quietly.

Source: https://carnovato.ru/peregrev-tormoznyh-diskov-posle-zameny-kolodok/

Brake discs get hot after replacing pads - what to do? – Automotoguru

Brake discs get hot after replacing pads

Good brakes are the key to your safety . This is not just a phrase from a driving school, but a rule that cannot be neglected. Every car owner should take care of their brakes. This means that he must change the brake fluid on time, check their serviceability and efficiency, and also monitor the wear of the brake pads and discs.

But there are situations when you regularly take care of the condition of the brakes, but unpleasant incidents still happen. For example, you may notice that your brake discs get very hot after replacing the pads .

Causes of disk heating and their diagnosis

You can determine whether the brake discs are heating up directly by touch. In a normal situation, after some time on the road, the discs may become warm, but you can touch them with your hand. If you feel that the temperature is too high or even smell a burning smell from the pads, then this is a deviation from the norm. Even if the disc overheats during braking, you will feel vibration.

But this is not always wrong. Sometimes new pads need to get used to the disc, so during braking immediately after replacement, primary wear of the material occurs. Because of this, overheating of the pads and disc occurs. On high-quality pads this process should disappear after 200-300 km. If this does not happen, then there may be several reasons.

The first reason is the caliper jamming. When driving on worn pads, the caliper piston may come out of the cylinder too much. In this case, the cylinder mirror in the place where the piston should initially be located may be damaged or oxidized. Therefore, after replacing the pads, the piston does not return to the desired position. In other words, the caliper does not release the brakes.

Checking the caliper for brake release after replacing the pads is the task of a car mechanic. If he didn’t do this, you can safely go to the service center and file a claim. This problem can be solved by replacing the caliper repair kit and lubricating all its components. If this does not help and the caliper does not release the brakes, then it needs to be replaced.

The second reason is a mismatch between the materials of the brake pads and discs.

For example, European manufacturers have stopped using asbestos in pads, so if you use their pads paired with Chinese, Russian or American-made discs, they may overheat. This problem can be prevented by careful selection of spare parts and the materials from which they are made.

Consequences of overheating brake discs and their prevention

If you drive a car for a long time with overheating discs, this can lead to dire consequences. Due to high temperature, the disc material may change its properties, and the disc will be covered with a thin film. Because of this, braking efficiency is reduced. The pads will simply slide over the disc.

Further overheating of the brake components will lead to caliper failure, destruction of the brake pads and deformation of the disc. This will cause the brakes to fail, which in most cases leads to an accident.

Ignoring brake system problems can lead to disastrous results. Timely detection and elimination of the cause of heating of the brake discs is the only correct solution in this case.

But an even better solution would be to prevent the problem. Buy high-quality spare parts from trusted manufacturers, and entrust their installation to professionals at trusted service stations .

Of course, this may cost a little more than buying a cheap analogue of pads and installing them in “Uncle Vasya’s” garage, but think about whether it’s worth saving on your safety and the safety of passengers or other road users.

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10 Jun 2009 45 Audi 80 1.8 SF carb. 88
10 Jun 2009 45 Audi 80 1.8 SF carb. 88
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Source: https://avtomotoguru.ru/greyutsya-tormoznye-diski-posle-zameny-kolodok-chto-delat/

Why do brake discs get hot?

Modern cars, including production models, are quite powerful and fast, so the uninterrupted operation of the braking system is a priority. When the brake discs heat up in the car, this is one of the signs of problems in the brake system.

In order to understand this problem, you need to understand the principle of operation of disc brakes, consider the types of discs, the basic requirements for them and the reasons that cause them to heat up, and also understand how to recognize overheating and what consequences it can lead to.

Brake operation

Front and rear brakes of this type are installed on many modern cars due to their reliability, efficiency and ease of maintenance.

The principle of their operation is simple - the caliper piston presses on one of the pads, while the second is automatically pressed by its body thanks to movable guides.

Both pads compress the brake disc on both sides, after which, due to friction, the movement slows down.

Since any friction contributes to the conversion of kinetic energy into thermal energy, when braking the discs and pads begin to heat up. Sometimes to such an extent that after sharp braking they emit smoke. To minimize this phenomenon, manufacturers began to produce various types of these spare parts.

Types

Standard discs for many car brands are made of cast iron.

This is explained by its good friction properties and inexpensive cost. But these parts made of cast iron have a number of disadvantages. With frequent braking, they begin to heat up greatly, up to several hundred degrees, which can cause smoke to appear when the friction layer of the pads melts and warping of the pads themselves.

And if water gets on their overheated surface to such an extent, then they can simply crack.

To reduce overheating, they began to produce ventilated discs with machined voids inside.

But this did not radically change their characteristics. Therefore, manufacturers became concerned about replacing them and began producing new perforated and slotted products made from steel alloys. In the first, additional ventilation is provided by many small holes along the entire diameter.

And the second ones have grooves machined on both sides.

After replacing standard ones with perforated or slotted disks, they begin to heat up significantly less. And everyone who replaced the standard cast-iron brake elements with slotted or perforated ones immediately felt the difference.

Basic disk requirements

For security purposes, disks must meet the basic requirements that apply to them:

Stability of characteristics when heated.
Not responding to heatstroke.
Resistance to adhesion (low adhesion threshold).
Quite high thermal conductivity of the material from which it is made.
High coefficient of friction and strength.

If the product does not meet these requirements, the possibility of the car getting into an accident increases significantly.

Reasons for heating

Many motorists wonder why brake discs get hot? It seems that when examined at a service station, the wheels rotate freely, without catching anything, but after driving, it is impossible to touch this part of the brakes. There are several reasons for this phenomenon:

Heavily worn discs and pads. This can happen when they were supposed to be changed, but they didn’t do it on time. After all, when the thickness of the metal decreases, when overheated, it is easier to warp.

The owner installed new low-quality pads.
After replacement, the brake system was filled with low-quality brake fluid.
The disk itself has become deformed. This happens when water gets on heated metal.
The disc also gets hotter during aggressive driving. In which the constant change of acceleration and braking does not allow the brake elements to cool down.
If the car is equipped with rear drum brakes, then the front brake discs heat up mainly when braking.

How to recognize and what causes overheating?

It is not always possible to understand that the discs are overheating greatly, except in cases where smoke comes out when braking. Although their heating of more than 200 degrees should already raise a question in every car owner - why do the brake discs heat up more than they should? Indirect signs will help you understand this:

After gently pressing the brake pedal, the pads strongly block the brakes and do not move away from the discs, even when braking is completed, although they should do so. The car may skid. This happens when the guides jam. When replacing pads, it is always necessary to lubricate the caliper guides.
Jerking, knocking, vibration, and light smoke in the wheel area after braking may also indicate problems caused by faulty brake discs.
Increased fuel consumption is another indicator that the brake system is faulty and blocked.
After replacing the pads, it was impossible to gain the required speed, and light smoke appeared when driving. This can happen when installing brake pads with a thicker friction layer than necessary.

When such signals appear, you must immediately inspect the condition of the pads and discs and replace defective parts.

Consequences of overheating

We found out why brake discs can heat up. Now let's figure out what can happen if you ignore the appearance of smoke and overheating. Inaction when such a problem is identified is more expensive for yourself.

If the friction material and the discs themselves overheat, it is difficult to hope for uninterrupted operation of the braking system. Initially, their structure will change, and they may become covered with a film or plaque.

In this case, the friction layer will begin to slide along the disc like skates on ice, and it will become impossible to hope for effective braking. This will lead to partial failure of the brakes, loss of the ability to fully control the car and, quite possibly, to an accident.

Timely detection of overheating and elimination of its causes can protect the car owner from many sad consequences. In order to initially prevent overheating of the brake components, you need to buy high-quality spare parts from trusted brands.

Watch the video on the topic:

The article first appeared on AutoRemont2.ru

Source: https://avtodoc24.ru/otchego-greiutsia-tormoznye-diski/

Why do brake discs get hot after replacing pads?

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Brake discs get hot after replacing pads

Good brakes are the key to your safety. This is not just a phrase from a driving school, but a rule that cannot be neglected. Every car owner should take care of their brakes. This means that he must change the brake fluid on time, check their serviceability and efficiency, and also monitor the wear of the brake pads and discs.

But there are situations when you regularly take care of the condition of the brakes, but unpleasant incidents still happen. For example, you may notice that your brake discs get very hot after replacing the pads.

Causes of disk heating and their diagnosis

But this is not always wrong. Sometimes new pads need to get used to the disc, so during braking immediately after replacement, primary wear of the material occurs. Because of this, overheating of the pads and disc occurs. On high-quality pads this process should disappear after 200-300 km. If this does not happen, then there may be several reasons.

The first reason is the caliper jamming. When driving on worn pads, the caliper piston may come out of the cylinder too much. In this case, the cylinder mirror in the place where the piston should initially be located may be damaged or oxidized. Therefore, after replacing the pads, the piston does not return to the desired position. In other words, the caliper does not release the brakes.

Checking the caliper for brake release after replacing the pads is the task of a car mechanic. If he didn’t do this, you can safely go to the service center and file a claim. This problem can be solved by replacing the caliper repair kit and lubricating all its components. If this does not help and the caliper does not release the brakes, then it needs to be replaced.

The second reason is a mismatch between the materials of the brake pads and discs.

Consequences of overheating brake discs and their prevention

Ignoring brake system problems can lead to disastrous results. Timely detection and elimination of the cause of heating of the brake discs is the only correct solution in this case.

But an even better solution is to prevent the problem. Buy high-quality spare parts from trusted manufacturers, and entrust their installation to professionals at trusted service stations.

Of course, this may cost a little more than buying a cheap analogue of pads and installing them in “Uncle Vasya’s” garage, but think about whether it’s worth saving on your safety and the safety of passengers or other road users.

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Nowadays, almost all cars are equipped with a disc brake system. It is an order of magnitude more effective than a drum one. However, during operation, owners are faced with the problem of overheating.

High disc temperatures can compromise your driving safety. After all, at some point this system will simply be ineffective.

In today's article we will look at why the brake disc gets hot after replacing the pads, and how to fix this problem.

Liquid

Previously, the braking system on cars was mechanically actuated. Over time, the machines began to be equipped with more modern components. They worked on a hydraulic drive. This made it possible to reduce the effort placed on the pedal.

At the same time, braking efficiency increases significantly. So, the system uses brake fluid. Flowing along the lines through the working cylinders, it creates a pressing force. As a result, the pads come into contact with the disc. Many motorists do not know what kind of life this fluid has.

But the efficiency of the caliper cylinders depends on its condition. Experts recommend changing this fluid every 2 years or after 50 thousand kilometers. Why was she given such a sentence? This is because the liquid is very hygroscopic. Over time, it absorbs moisture.

The latter has a destructive effect on all elements of the brake system, causing corrosion. As a result, the piston no longer presses the pad as effectively. There are frequent cases when it simply gets stuck in one position. The pad, in turn, comes into contact with the disc, causing heat.

Experienced motorists are advised to regularly check the brake fluid level in the reservoir. It should be between the minimum and maximum marks.

If necessary, add it to the required level. An important point - do not mix different liquids. There are means of class DOT-3, 4, 5 and 5.1. They all have their own boiling point (around two hundred degrees) and properties. If you do not know what kind of fluid was previously filled, replace it completely.

Human factor

Over the years, the curb weight of cars increases, and engine power increases. The car owner, without noticing it, presses the trigger and does not think about the operation of the brake system.

Just remember the simple laws of physics. As resistance increases, the friction force also increases. The same can be said about disks.

To reduce speed on a one and a half ton car, the pads require a lot of compression force.

The temperature of the working surface increases significantly. And if we add to this an aggressive driving style, it becomes clear why the front brake discs get hot. You should not intentionally load this system by frequently pressing the pedal. This negatively affects the life of the pads and the disc itself. The latter can simply become deformed from overheating or burst.

Other reasons

If your brake disc gets hot after replacing the pads, pay attention to the condition of the caliper. If it wedges, the block will not fit tightly to the working surface. As a result, the coefficient of friction will increase.

You should also check the presence of grease on the car's caliper guides. Under the cover (located on the back of the mechanism) there should be no dry lubricant, traces of dust and dirt. They also look at the condition of the rubber boots.

If they are cracked or broken, they need to be replaced immediately.

Mixed braking system

Now we will not talk about pneumohydraulic or other systems. The reason is simple - the manufacturer installs disc brakes in front and drum brakes in the rear. Naturally, the latter system is not effective. It is not able to handle the load the way a disc caliper can. As a result, all energy is transferred to the front axle. Then the brake discs heat up.

The reason here is either poorly adjusted “drums” or driving style. Some motorists do something drastic - they put ventilated discs on the front. This option is a little more complicated than usual.

But thanks to the special design it cools down faster. The ventilated disk consists of two plates 5-7 millimeters thick, between which there are grooves for air.

Some manufacturers supplement the work surface with perforations (small holes on the side).

Price

How much does a ventilated brake disc cost? Its price is from two thousand rubles per unit. Feedback from those who have installed such elements is only positive. The brake discs no longer get hot during operation. The reason for the replacement is the low efficiency of the factory brake elements. This procedure is often performed by owners of domestic cars.

Disk Status

It happens that even after changing the fluid and adjusting the rear drums, the brake discs get hot. The reason lies in the state of the work item itself. Pay attention to its thickness. It should not be less than 20 millimeters. If this is the case, you will need to purchase and install a new set of brake discs.

By the way, they change in pairs, regardless of the state of the neighboring element. The manufacturer also indicates the service life after which these mechanisms need to be changed. When to change brake discs? The replacement schedule is 150 thousand kilometers. For the pads themselves, this period is much shorter - 15-20 thousand.

However, the resource largely depends on the driving style.

If the thickness of the element is more than 20 millimeters, and your brake disc still gets hot after replacing the pads, pay attention to the condition of the working surface itself. It should be perfectly smooth. If the disc “floats”, the contact area with the pads will be much smaller.

Accordingly, the friction force will increase several times. We draw your attention specifically to hidden defects, since if there are cracks, such a part must be replaced in any case. If the brake element is intact, but there are sagging, a groove will save the situation. This procedure costs around one and a half thousand per pair.

The work can be done either by removing the disk or on site.

You can find out how hot the element was heated by the color of the working surface. So, if the disk has a yellow tint, its maximum temperature was 280 degrees. The blue color indicates that the mechanism was heated to 400 degrees. There are cases when the disk operated in the range of 500 degrees Celsius or more. In such a situation, the work surface will be black.

Conclusion

So, we found out why the brake disc heats up after replacing the pads. In the future, when installing new friction elements, carefully remove dirt and deposits from the seats. Also, when the calipers become sour, change the lubricant in the guides and anthers. Carry out maintenance on time, and then you will not wonder when to change your brake discs.

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Brake discs get hot after replacing pads - what to do?

Every car owner must keep the brake system in perfect condition. The safety of all road users depends on the quality of its work. Therefore, the question of why the front brake discs heat up is quite relevant for drivers with different experience.

Any vehicle must be obedient to its owner, especially the braking system. So, let's look at the possible causes of overheating and ways to eliminate them.

Types of brake discs

One of the popular braking systems is the disc design. The effectiveness of this model has been proven in practice and adopted by most popular car companies. There are several design options in which the disk material can be different:

cast iron;
forged steel;
metal ceramics;
carbon fiber.

The last two varieties are more expensive to use and therefore are used less frequently, although they are highly effective. Most often they can be found on sports models.

First, let's figure out whether the brake discs on a car should heat up or not. In short, yes, they should. When braking, the brake pads press on the disc from both sides, and a friction force arises between the materials, as the disc rotates and the pads are rigidly fixed in the caliper.

In this case, the kinetic energy (movement) of the car is spent on overcoming the friction of materials and goes into heating the brake discs and pads. It is important to understand that heating of the brake mechanisms is absolutely normal, but it should not be excessive. It is also not the heating itself that is important, but the degree of deformation after it.

During prolonged braking, for example, on a serpentine road during a descent, severe overheating of the brake discs can occur and, as a result, they warp, which will subsequently cause beating when the brake pedal is pressed.

And if you get into a puddle at the same time, a sharp change in temperature can lead to a crack in the brake disc.

Carbon brake discs

For metal-ceramic or carbon-fiber products, the heating temperature reaches 1200-1400C. At the same time, the friction coefficient is significantly higher, and they are also not subject to thermal deformation. Their main disadvantage is their price, which is why these materials are not used by the general public.

Source: http://po4emuchka.ru/pochemu-posle/pochemu-greyutsya-tormoznye-diski-posle-zameny-kolodok.html

Brake discs get hot: causes, solutions

Disc brakes were invented at the beginning of the twentieth century, but their widespread use began only several decades later.

https://www.youtube.com/watch?v=twulhr-54bk

It was then that this design was brought to perfection by correcting the vast majority of shortcomings. But even the most perfect system can sometimes fail.

The principle of operation of such brakes is similar to a bicycle shoe brake, except that the shoes are pressed not against the wheel, but against the surface of the brake disc.

The drive on them is carried out not through a cable, but through hydraulics. The friction that occurs between the pad and the brake disc (a separate article about them) leads to the vehicle stopping. Such close contact causes a lot of heat to be released, which must be removed to cool the system.

To cope with this as efficiently as possible, special ventilation was invented.

It should also be noted the benefits of perforated disks, . This design ensures more effective cleaning of the braking surface due to dirt mixed with water clogging into the holes.

Thus, disc brakes can be called one of the best choices for installation because they are effectively cooled by air circulation between the surface of the pad and the disc itself.

They are also capable of independently cleaning themselves from dirt and wear products, because metal dust and gases quickly fly away from the disk during its intensive rotation.

Running in a new car is the key to its longevity.

An incorrectly selected class of motor oil can lead to irreversible consequences. Read: classification of motor oils.

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Experts note that the main advantage of such brakes is their high stability, high response speed and wide adjustment possibilities.

If we consider the issue in general, the main reasons for overheating of brake discs are during the braking process. However, to identify a specific problem, qualified diagnostics of the vehicle's brake system will be required.

Heating of the disc due to the close contact of the brake pad with its functional surface occurs almost instantly, but it takes time for the temperature to drop. When driving in the city cycle, a situation often arises when the driver causes the disc to overheat, often accelerating and braking.

An aggressive driving style can also lead to this development of events, because sharp acceleration and instant braking ensure continuous heating of the brake discs.

The above-mentioned reasons relate to the manifestation of the human factor, but there are also various mechanical nuances and malfunctions of the brake system, up to the banal jamming of the boot between the caliper and the piston (see more), which leads to the fact that the piston stops moving.

When considering the question of why brake discs heat up, it is necessary to highlight the following factors leading to brake system failure :

Deformation of the surface of the notorious disk. As a rule, this problem is solved by grooving the disk, if its thickness allows this, or by completely replacing the part.

Installation of brake pads of unsatisfactory quality.

Using rear drum brakes. This is why the front brake discs heat up, since in this case they take on the vast majority of the load. Thus, when trying to answer the question of why the front brake discs get hot, it would be a good idea to check whether the drum brakes are installed backwards.

Recognizing existing problems with the brake system is quite simple. This may be indicated by intense vibration , and during braking, extraneous sounds , and the car jerks jerkily .

As for sounds, the characteristic noise is a metallic grinding noise heard when braking. This happens because the metal of the pad base clings to the shoulder, which is located on the front surface of the brake disc with an impressive degree of wear. The brakes may lock even with light pressure on the pedal.

A visual inspection can also be carried out. For example, if the rear brake disc is heating up, you should examine its surface through the holes in the wheel rims. There should be no suspicious cracks or chips on it.

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Consequences that can result from excessive heating of brake discs

Constant intense heating of discs and pads can cause the material from which they are made to change their properties. In this case, a film appears that is located between the pads and brake discs.

This malignant film has the ability to significantly reduce the coefficient of friction of the pads on the working surface of the brake disc. Thus, the efficiency of the braking system is significantly reduced, and even if you somehow adapt to the weakened braking, it is not possible to cope with the boiling of the brake fluid.

This can lead to complete breakdown of the entire braking system. Severe overheating in most cases also leads to brake pad or caliper failure. If the brake discs get hot after replacing the pads, then it is likely that corrosion around the brake cylinder rubber leads to jamming.

Since overheating of discs can occur due to damage to the working surface, thinning brake pads or poor quality, it is necessary to promptly change brake pads and discs, purchasing only high-quality products. Finding the best brake pads is very important.

It is necessary to carefully ensure that the thickness of the brake disc always corresponds to the approved parameters.

Many automakers insist that brake discs are not subject to qualified repairs. However, today there is equipment that can cope with the elimination of a number of defects that arise during operation of the braking system.

So, you can get rid of the shoulders and grooves on the disk by grooving , and you can do this without dismantling the product from the machine. This operation significantly reduces the grinding process of newly installed pads and has a positive effect on the efficiency of the functional component of the brake system.

The groove ensures high-quality removal of a certain layer of material from both sides of the brake disc. But you can also remove the bead with a file pressed against the untwisted disk.

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Grinding of brake discs is usually performed after three sets of pads have been replaced. There are several factors that increase the need for such a groove.

First of all, it is worth mentioning the aggressiveness of the pads in relation to the working surface of the disc, which is formed based on the presence of coarse abrasive particles contained in the friction lining. Friction mixtures may also contain hard reinforcing fibers made of metal.

A groove is also needed in case of violations of the operating rules, allowing sudden temperature changes that lead to warping of the disk. It must be remembered that excessively wear-resistant pads can lead to disc wear. Thus, pads must be purchased only from trusted suppliers.

But our experts explain why to change the brake fluid on another page of the site.

Source: http://tbf.su/sovety-avtolyubitelyam/greyutsya-tormoznye-diski-prichiny-sposoby-ustraneniya