The brake disk is heated after replacing the shoes. When to change the brake discs

Now almost all cars are equipped with a disc brake system. It is an order of magnitude more effective than the drum. However, in operation, owners face the problem of overheating. The heat of the discs may call into question your traffic safety. After all, at some point this system will simply be inactive. In today's article, we will consider why the brake disk is heated after replacing the shoes, and how to eliminate this malfunction.

Liquid

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

At the same time, the efficiency of braking increases many times. So, the system uses brake fluid. Flowing through the mains through the working cylinders, it creates a clamping force. As a result, the pads are in contact with the disc. Many motorists do not know what kind of resource this fluid has. But the efficiency of the support cylinders depends on its condition. Experts recommend changing this fluid every 2 years or 50 thousand kilometers. Why is she given such a term? All because the liquid is very hygroscopic. Over time, it absorbs moisture. The latter acts destructively on all elements of the braking system, causing corrosion. As a result, the piston no longer effectively presses the shoe. Frequent cases when it simply jams in one position. The shoe, in turn, is in contact with the disc, causing heating. Experienced motorists advise regularly check the level of brake fluid in the tank. It must be between the minimum and maximum marks.

If necessary, add it to the desired level. Important point - do not mix different liquids. There are facilities of class DOT-3, 4, 5 and 5.1. All of them have their boiling point (about two hundred degrees) and properties. If you do not know which fluid was previously filled, replace it completely.

Human factor

Over the years, the curb weight of vehicles is increasing, and the engine power is increasing. The car owner, without even noticing it, squeezes on the trigger and does not think about the braking system. Suffice it to recall the simple laws of physics. With increasing resistance, the frictional force also increases. The same can be said about disks. To reduce the speed on a one-and-a-half-ton car, the pads require a large compression force.

The temperature of the working surface increases many times. And if we add to this an aggressive style of driving, it becomes clear why the front brake discs are heated. Do not intend to load this system, often by pressing the pedal. This negatively affects the resource of the pads and the disc itself. The latter can simply deform from overheating or burst.

Other reasons

If you are warming the brake disc after replacing the shoes, pay attention to the status of the support. If it wedges, the shoe will not fit snugly against the work surface. As a result, the coefficient of friction will increase. Also check the presence of grease on the guide rails of the vehicle. Under the cover (located in the back of the mechanism) there should be no dry lubrication, traces of dust and dirt. Still looking at the condition of rubber anthers. If they are cracked or punctured, they need to be replaced urgently.

Mixed braking system

Now we are not talking about pneumohydraulic or other system. The reason is banal - the manufacturer installs front discs, and rear drum brakes. Naturally, the latter system is not effective. It is not able to work out the load the way a disc caliper does. As a result, all energy is transferred to the front axle. Then the brake discs are heated.

The reason here is either in poorly regulated "drums", or in the manner of driving. Some motorists act in a cardinal way - they put on front of ventilated disks. This option is a little more complicated than usual. But thanks to a special design it cools down faster. The ventilated disc consists of two plates with a thickness of 5-7 millimeters, between which there are grooves for air. Some manufacturers supplement the work surface with perforations (small holes on the side).

Price

How much does the ventilated brake disc cost? Its price is from two thousand rubles per unit. Feedback from those who have established such elements are only positive. During operation, brake discs are no longer heated. The reason for the replacement is the low efficiency of the factory brake elements. Often such a procedure is done by owners of domestic cars.

Disk Status

It happens that even after changing the fluid and adjusting the rear drums, the brake discs are heated. The reason lies in the state of the working element itself. Pay attention to its thickness. It should not be less than 20 millimeters. If so, it is necessary 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. Also, the manufacturer specifies the resource, after which it is necessary to change these mechanisms. When do I change the brake discs? The replacement schedule is 150 thousand kilometers. At the pads, this time is much less - 15-20 thousand. However, in many respects the resource depends on the style of driving.

If the thickness of the element is more than 20 millimeters, and you still heat the brake disc after replacing the shoes, pay attention to the condition of the working surface itself. It should be perfectly flat. If the disc "swam", the area of contact with the pads will be much smaller. Accordingly, the frictional force will increase several times. We draw your attention to the hidden defects, since in case of cracks such a detail in any case must be replaced. If the braking element is complete, but there are inundations, the situation will be saved by a groove. There is this procedure in the area of one and a half thousand for a couple. Work can be performed, both with the removal of the disk, and on the spot.

To find out how much the element was heated, you can by the color of the working surface. So, if the disc has a yellow tinge, its maximum temperature was 280 degrees. The blue color indicates that the mechanism was heated to 400 degrees. There are times when the disc worked in the range of 500 degrees Celsius or more. In such a situation, the working surface will be black.

Conclusion

So, we have found out, for what reasons the brake disk is heated after replacement of blocks. For the future, when installing new friction elements, carefully remove dirt and deposits from the seats. Also, when the support is sour, change the lubricant in the guides and anthers. Perform maintenance on time, and then you will not be wondering when to change the brake discs.