Now almost all cars are equipped with a disc brake system. It is an order of magnitude more effective than drumming. However, during operation, owners are faced with the problem of overheating. Heat discs may compromise your driving safety. After all, at some point this system will simply be inactive. In today's article, we will look at why it heats up after replacing the pads, and how to fix this problem.
Behind the newly released screws are sliding bushings that need to be tested for feasibility. This simplifies the process of checking that the connectors move back and forth correctly. If this is not the case, we recommend new purchase. Otherwise, the bushes must be sanded and lubricated with cylindrical paste.
Now brake pads can be removed from the outside. Then, loosen the two brake caliper holder screws with a 14mm hex wrench and remove the holder. Now the two mounting screws are loosened with a 12 ring wrench to remove the old brake discs. If the brake discs do not come off easily, do not use force. It is better then to treat the brake discs with a rust remover and try to beat the discs gently.
Liquid
Previously, on cars, it was driven mechanically. Over time, machines began to be equipped with more modern units. They worked for hydraulic drive. This allowed to reduce the effort placed on the pedal.
At the same time, the braking efficiency increases significantly. So, the system uses brake fluid. Flowing along the highways through the working cylinders, it creates downforce. As a result, the pads are in contact with the disc. Many motorists do not know what resource this fluid has. But the efficiency of the caliper cylinders depends on its condition. Experts recommend changing this liquid once every 2 years or after 50 thousand kilometers. Why was she given such a time limit? This is because the liquid is very hygroscopic. Over time, it absorbs moisture. The latter has a destructive effect on all elements brake system causing corrosion. As a result, the piston no longer presses the block as effectively. There are frequent cases when it simply jams in one position. The pad, in turn, comes into contact with the disc, causing heat. Experienced motorists are advised to regularly check the level brake fluid in a jar. It must be between the minimum and maximum marks. 
Preparing to install new brake discs and brake pads
After loosening the fixing screws and removing brake discs the wheel hub is polished with a steel brush. There should be no rust residue on the hub. This is important because otherwise the new disc cannot rest on the entire surface and otherwise sit on the wheel hub.
Now we have to take care of the caliper holder. At the top and bottom of the saddle are the so-called ladder plates, which we can easily remove with a flat screwdriver. Often the sheets are bent, so we also recommend a full exchange here. After removal, the supporting surfaces of the partitions are thoroughly cleaned.
If necessary, top up to right level. Important point- do not mix different liquids. There are means of class DOT-3, 4, 5 and 5.1. All of them have their own boiling point (around two hundred degrees) and properties. If you do not know which fluid was filled earlier, 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. Enough to remember simple laws physics. As the resistance increases, the friction force also increases. The same can be said about discs. To slow down on a one and a half ton car, the pads require a lot of compression force. 
Installation of brake discs and brake pads
The support surface can be easily cleaned with a flat arrow. Now apply the ceramic paste to the wheel hub. Before the discs are finally installed, it is important to compare again that they are also right brake discs. You should then be able to easily clean the brake discs with a brake cleaner.
Then place the brake discs on the wheel hub. And with two machine screws and a 12-star ring wrench, hand-tighten the disc. To prevent premature rusting, ceramic paste should also be applied to the baffle bearing surfaces on the caliper bracket.
The temperature of the working surface increases significantly. And if you add to this an aggressive driving style, it becomes clear why you should not intentionally load this system by pressing the pedal frequently. This negatively affects the resource of the pads and the disc itself. The latter can simply deform from overheating or burst.
After that, new conductive sheets can be put on. You can also use an old ladder, but then they also need to be cleaned. This is not easy because the sheets are often bent or damaged. That's why we decided to create full set including new stair panels.
The brake caliper holder can now be screwed on again at the top and bottom. The old brake pads are checked, you can clearly see the side the pistons are pressed on. This page comes from new brake pads inside. If you are sure that the brake pads are in right direction, you can place them in the holder.
Other reasons
If your brake disc heats up after replacing the pads, pay attention to the condition of the caliper. If it wedges, the block will not fit snugly against the work surface. As a result, the coefficient of friction will increase. You should also check the presence of lubrication on the car. Under the cover (located at 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 anthers. If they are cracked or broken, they need to be replaced immediately.
Now we need to reset the caliper pistons. This is done with the so-called piston reset. Unfortunately this was not available so we did this as an alternative with two pliers. Please, be careful. If you need to reset with two pliers, it makes sense to use pliers as both pliers move parallel to each other when squeezing.
This minimizes the risk of accidental tipping of the pistons. After the pistons have been pushed back, the wear indicator is guided through the middle of the seat again and connected. The brake caliper can then be reinstalled and secured with two screws. Make sure the screws are always hand-tightened to prevent damage to the threads. The dust caps are then placed over the screws.
Mixed braking system
Now we will not talk about pneumohydraulic or other systems. The reason is banal - the manufacturer installs discs in front, and in the back. Naturally, latest system is not effective. She is not able to work the load the way she does. disc caliper. As a result, all energy is transferred to the front axle. Then the brake discs heat up. 
Grinding, rubbing or low level brake fluid - all signs of worn brakes. When it's time to change the brake discs and brake pads, as well as maintenance costs. If this symbol lights up in the instrument cluster, the brake pads are worn out. A change in a seminar usually costs between 80 and 300 euros.
No doubt, at some point the brake pads are worn out, the discs are worn out. That is why it tests its strength with every service and wheel change. When viewing the thumb, the brake pads should be replaced with two millimeters of residual padding, drum brake pads at least one millimeter. Almost all cars and wear indicators can be found on disc brake pads today. They can work electrically and light up the light on dashboard or mechanically, while the metal pin begins to scratch loudly on windshield when the wear limit is reached.
The reason here is either in poorly adjusted "drums", or in driving style. Some motorists act in a drastic way - they put ventilated discs on the front. This option is a little more complicated than usual. But thanks to the special design, it cools faster. The ventilated disk consists of two plates 5-7 mm thick, between which there are grooves for air. Some manufacturers supplement the work surface with perforations (small holes on the side).
Costs depend on the size and type of vehicle
The vibrating noise that is then heard when braking is the main challenge to visit the workshop. Find the right workshop. Compare prices View customer reviews. . Big components cost big money. The cost of brake maintenance primarily depends on the worn parts that need to be replaced. If only the front brake pads need to be replaced, it is certainly cheaper than replacing the brake discs. The size of the brake discs and plates also plays a role. Smaller ingredients are more economical than family pizza slices.
Price
How much does a ventilated type brake disc cost? Its price is from two thousand rubles per unit. Reviews of those who installed such elements are only positive. During operation, the brake discs no longer heat up. The reason for the replacement is the low efficiency of the factory brake elements. Often this procedure is done by owners of domestic cars.
During working hours, when changing the lining, it is necessary to calculate from 20 to 30 minutes per wheel. Many workshops offer brake pad replacement according to full price. Prices range from 80 to 300 euros, depending on the model. If the windows also need to be changed, the price can double or even triple. Since the cost of brake discs is much higher, the additional work time, however, is in the frame. Sometimes it happens that parts of the brake get stuck and cannot be resolved properly, which can greatly increase the working time.
There are clients here who can be refurbished at a pre-agreed price. Otherwise, the seminar will be compensated for a longer working day. In addition, the pistons brake calipers or brake cylinders drum brake may wear out. The cost is also significantly higher due to longer working hours. However, these repair work rare.
Disk Status
It happens that even after changing the fluid and adjusting rear drums 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 so, you need to purchase and install new kit brake discs. By the way, they change in pairs, regardless of the state of the neighboring element. The manufacturer also indicates the resource, 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 less - 15-20 thousand. However, in many respects the resource depends on the driving style. 
Large alloy wheels allow a good view of the brake disc. Therefore, in some cases it is possible to assess the state brake pads. Brake discs and drums contain information about acceptable minimum thicknesses, or generally two to three millimeters of wear is allowed before these parts must be replaced. Important: as brake wear increases, the capacity level of the container also decreases. However, you should not complete them unless they have reached the minimum. Otherwise the container overflows when the workshop collects new parts and puts everything brake pistons above.
If the thickness of the element is more than 20 millimeters, and your brake disc is still heated after replacing the pads, pay attention to the condition of the working surface itself. It must be perfectly flat. If the disc "floated", the contact area with the pads will be much smaller. Accordingly, the friction force will increase several times. We draw your attention to hidden defects, since in case of cracks such a part must be replaced in any case. If brake element whole, but there are influxes, the groove will save the situation. Costs this procedure in the region of one and a half thousand for a couple. Work can be performed both with the removal of the disk and on the spot. 
Tow the brake vigorously from time to time
Problem: Regardless of the degree of wear of the brake components, unpleasant side effects can occur when braking. This includes scratches, so if the brake is applied differently in one revolution of the wheel. Causes can vary from brake disc to rain retention to overheating due to overheating or as a side effect of a bent wheel hub. IN engine compartment There is a compensation tank for brake fluid. Do not fill until the level is below the minimum mark.
You can find out how much the element has been heated by the color of the working surface. So, if the disk has a yellow tint, its maximum temperature was 280 degrees. Blue color says that the mechanism heated up to 400 degrees. There are times when the disk worked in the range of 500 degrees Celsius or more. In such situation working surface will be black.
While the early stage of rust can still be slowed down by normal conditions use, the garage should check the run-out and run-out of all components with a dial indicator if closed parts are suspected. Some types Vehicle also tend to have extremely rusty brake discs on rear axle. The reason is too careful driving, subject to gentle braking, the catches are barely pressed against the discs, they cannot erase rust and dirt. Therefore: If the situation with road traffic allows, among other things, to calmly step on the pedal harder.
Conclusion
So, we found out for what reasons the brake disc heats up after replacing the pads. For the future, when installing new friction elements, carefully remove dirt and deposits from seats. Also, when the calipers become soured, change the lubricant in the guides and anthers. Perform maintenance on time, and then you will not wonder when to change the brake discs.
Vision is also needed with noises. Light scratches in the morning are normal because the humidity during the night coats the friction surfaces by touching the rust surface. On the other hand, constant noises, perhaps even without brake operation, are a workshop case. This also applies if the car is pulled to one side when braking. Because it doesn't have to be the brakes' fault, they are also common. On the other hand, if the car pulls from the side, even if it is not braked, the brake may get stuck.
Anyone who has this suspicion must feel that he is significantly warmer than the opposite. If, on the other hand, all brakes are working properly, they can be easily tested during very slow driving: decelerate to the point of stopping, disengaging and turning around. If the car stops with a slight jerk, something is hard somewhere. What, but it is best to know the workshop.
Before figuring out "why" and "how to fix", you need to immediately clarify. After replacing the brake pads, it is often not the wheels themselves that are heated, but the discs. And this is indeed a very common phenomenon.
There can be many reasons. We will talk about them below. In the meantime, about where it all leads. When the disks are heated, the metal becomes less durable. And if you instantly cool it, for example, drive through a puddle, then the material will begin to deteriorate. Noticeable cracks will appear, the geometry will change. What this will lead to in the end is not so difficult to guess. Hot discs are a safety hazard.
Before you know anything, brake pads and discs are important functions the safety of your vehicle. We are fortunate to have a mechanic friend who has tested every step we explain in this article to make sure we are doing it right. If you are unsure of yourself, change them in the garage, your life is at stake.
What are pads and brake discs used for?
Brake discs are attached to your wheels and are driven at the same time as the drive train. When you depress the brake pedal, the brake pads are tightened on both sides of the 4 discs, which causes friction and slows down your car. This means that friction means wear and tear, so discs and pads need to be changed regularly to keep them performing optimally.
It is clear that sitting in the car, you will not know whether your disks are heating up or not. But there is an opportunity to suspect this by secondary factors. For example, it is worth taking a closer look at whether the wear of the brake pads has accelerated. Also, a defect may be hinted at by an increase in fuel consumption and a characteristic knock under the wheels while driving.
When you change discs, you must change the brake pads at the same time. However, you are more likely to change only the brake pads. Piston piston piston or pipe wrench Wrench Large screwdriver Hammer Iron brush Gasket socket of solid front brake wedges braking device new brake pads new brake discs. To restore the growth of the pistons, we bought a portfolio on the Internet for thirty euros: a box piston with a return.
It's possible to get by, but it depends on the vehicles and it's quite difficult, so we preferred to buy piston sprouts. To get started, you must remove the wheel that you want to change pads and rims on. To disassemble the wheel, the truck must be mounted until the wheel is off the ground, using a jack to stop the van from falling on you if the jack is released. We place candles and large wooden wedges to support our van and work safely under it.
Don't pretend to be a racer
One of the main causes of hot discs is driving style. This is especially true for city driving. Especially for those who love to "break" from traffic lights. Driving on city streets is fundamentally different from traveling on the highway. There are many more stops here. And you need to try as little as possible to brake sharply and accelerate. Try to do it smoothly. And in general, the more aggressive the driving style, the faster the brakes heat up. This means that the probability of occurrence of defects increases many times over.
In this case, overheating of the disks is completely on the conscience of the drivers. Of course, no one forbids driving the way you want. But reckless drivers should remember that with such a driving style, however, like the front ones, it should become a frequent and mandatory procedure for them.
Mechanical causes of overheating
For the most part, the following points lead to overheating of disks:
- Raising the temperature of the discs can very often be due to bad brake fluid. Or her not enough. Experienced drivers know that the liquid level should be somewhere between the "minimum" and "maximum" marks, but not how not to go beyond both of these boundaries.
- The second reason for overheating can be related to the wrong thickness of the brake pads. In the passport for a car, this value is usually prescribed. And if the difference is at least one millimeter, then this immediately increases the risk of a defect. The experts of our car service recommend changing the brake pads after every 20 thousand kilometers.
- It happens that heating occurs due to defects in the disks themselves. Any deviation from the original geometry immediately causes a corresponding reaction. And it is not uncommon for such cases when the disk simply bursts during movement. And this can lead to the most disastrous consequences.
