Rear brake disc: Replacement and repair

Brake discs are the most important part in the system of any car. On the condition of this component, the safety of the driver, passengers and other road users depends. If one of the discs is worn out, this is a direct threat to safety on the road. Often higher loads are experienced by front discs, but this does not mean that the rear brake disc is not a responsible part. This element requires maintenance, replacement and repair, as well as the front.

What affects wear?

On the issue of wear, there are no clear parameters. Each manufacturer gives its characteristics and digital parameters regarding this. There are tables for various brands and models of cars, as well as digital data for each model within the same brand. Various indicators are associated with the engine power, the weight of the car, and also with the consequences of all the physical forces acting on the machine during braking.

Materials

First of all, the speed of wear is affected by the materials from which the disc brake rear is made. The latter is usually made of cast iron, but today these elements are made from high-tech carbon and ceramic materials.

Mechanical factor

The resource is significantly affected by the mileage of the car, as well as the brake pads. If the pads are of poor quality, the wear will be uneven. Also on the surface of the part later, scuffs will be formed. In this case, the replacement of the rear brake discs will help . Sometimes it is possible to repair the parts by means of a groove. It is recommended that you replace the shoe.

Vehicle operation

This is a factor that mostly depends on the driver. For example, in winter, during the use of the machine, it is very easy to deform the brake rear disk. In the process of motion, it heats up, and since it's cold enough outside, the metal deforms from serious temperature changes. If this happens often enough, repair or replacement is inevitable.

Style of riding

Manufacturers represent specific figures. So, the rear brake disc of an average driver should work for 100-150 thousand km. However, some people travel in such a way that already after 15 thousand it is necessary to carry out the restoration - the disk is worn out more than half because of the aggressive driving style. If emergency braking is performed, this is a direct road to early wear.

How to diagnose

There are some standards of behavior of the machine, which can indicate whether replacement of the rear brake discs is required or not. You should pay special attention to these symptoms, because they depend on safety.

On wear, the first thing to say is locking the rear brakes when the brake pedal is depressed. Also on the failure of the brake disc can be recognized by the characteristic scraping when the pedal is pressed. In addition, during the braking process, vibrations, jerks, and other sounds can occur, which were not previously present. You can see the degree of wear and visually - on the worn brake discs, you can see chips, cracks, edges. It is quite possible to carry out the diagnosis with your own hands using a measuring instrument. For example, the rear brake discs ("Megan" 2nd generation including) have a nominal thickness of 8 mm. As for the minimum indicator, the manufacturer claims that it is 7 mm.

You can carry out the diagnostics right in the garage, but first you need to dismantle the wheels. Further, a replacement, repair or a trip to the service station. If the rear brake disc has such a defect as an uneven thickness, then you can perform a groove to thereby restore it. If the destruction of the surface is observed, only the replacement of the considered component will save.

To restore or change?

When it will be possible to determine the degree of wear (or if you notice that the brake pedal jerks when braking), the owner of the car faces the following question: replace the damaged part or try to repair it? Many are trying to implement the second option. It must be remembered that it is possible to punch the disc, but only if the residual thickness is four or more millimeters.

Specialists of service centers recommend changing the rear brake discs (Ford is no exception). However, if the prices for the new part seem too high, you can try to repair yourself.

It is important not to forget that the larger the metal layer will be removed during the repair, the less will the service life of the described part. Also, experts do not recommend installing contract discs. In this case, you will not have the exact data, where they were installed, how they were exploited and the like. Perhaps soon they will have to be repaired.

How to restore brake discs

With the repair of the front elements, there are no complications - they are crushed without removing it from the car (if it is with a front-wheel drive). The engine is turned on and the working surface of the workpiece is processed with a special tool. If you have special equipment, you can also pierce the rear brake disc "Kia-Sorento". The rear wheel is removed, then the machine rises on the jack. Then the device through the device is fixed for the wheel bolt and sets the disk rotation. With the help of another device, which is attached to the caliper, the groove itself is carried out.

You can also perform this procedure on the lathe. But then you have to remove the disc and carry it to the turner. As a result we get the most smooth and smooth surface. However, after mounting the disc on the car, beats may occur.

What is needed to replace the rear brake elements

So, if repair is not possible or the wear is too great, a replacement is made. To do this, you must purchase original products. It is important that when replacing the rear axle, two discs change at once. It is also recommended to install new shoes. Ideally, if the discs and pads are from one brand. Some car owners, with a desire to save money, do not change the pads to new ones by replacing disks. This will subsequently lead to a rapid wear of the element and the appearance of grooves on it.

Tool for replacement

To work, you need a few tools. This is a standard set of keys and heads, a jack, a balloon key. It is not superfluous to have a pit or flyover, a tripod for fixing the car, wheel chocks, and also a wire.

It is best if this operation is performed with an assistant. This will greatly accelerate the process of replacing the rear disc in the garage conditions. Before dismantling, you need to find out if you need self-locking bolts, or you can get by with conventional ones.

How to replace the brake disc with your own hands

If you exclude some features of the design of different brands and models of cars, the technology of dismantling and replacing the rear wheels for all cars is the same.

Let's see how you can replace the rear brake discs "Renault Megan" yourself. The vehicle in front and in the rear must be secured with wheel chocks. Next, the jack lifts the rear of the car. Before removing the disc, remove the operating point and press the piston on the working cylinder. The hub must be thoroughly cleaned of dirt. This action will not change the stubborn bearing in the future (but if it already buzzed, then an urgent replacement is needed). Next, you should invite an assistant - he must press the brake pedal, but you can also tighten the handbrake. Then unscrew the bolts securing the brake disc.

Then the brake clip is removed and fixed with a wire. This is done so that the hose on the brake system is not damaged. Then, the support assembly is dismantled - remove the pads, springs and clamp. Fix the hub, unscrew the bolts completely and, finally, remove the disc. To install a new one, you need to do all these operations in the reverse order. The main thing is not to forget to install new pads. After the replacement, it is necessary to pump the brakes. There must be no air pollution in the system. Otherwise, using such a car is simply dangerous.

Conclusion

We examined how to repair or replace the rear brake disc with your own hands. This is not the most complicated operation performed while servicing the car. You need to carefully treat any parts of the brake system, because it depends on safety on the road.