Brake discs are an essential part of any car’s system. The safety of the driver, passengers and other road users depends on the condition in which this part is located. If one of the drives is worn out, this is a direct threat to road safety. Often, higher loads are experienced by the front discs, but this does not mean that the rear brake disc is not a critical part. This item 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 makes and models of cars, as well as digital data for each model within the same brand. Various indicators are associated with engine power, car weight, as well as with the consequences of all the physical forces acting on the car during braking.
Materials
First of all, the materials of which the rear brake disc is made affect the wear rate. The latter is usually made of cast iron, but today these elements are made of high-tech carbon fiber and ceramic materials.
Mechanical factor
The resource is significantly affected by the mileage of the car, as well as the brake pads. If poor quality pads are installed, wear will be uneven. Also on the surface of the part subsequently galling will form. In this case, replacing the rear brake discs will help . Sometimes parts can be repaired with a groove. It is recommended that you replace the pads.
Car operation
This is a factor that for the most part depends on the driver. For example, in winter, in the process of using the machine, it is very simple to deform the rear brake disc. In the process of movement, it heats up, and since it is quite cold outside, the metal is deformed due to serious temperature changes. If this happens often enough, repair or replacement is inevitable.
Riding style
Manufacturers present specific figures. So, the rear brake disc of an average driver should work out for 100-150 thousand km. However, some drive in such a way that after 15 thousand they need to perform restoration - the disk is more than half worn out due to aggressive driving style. If emergency braking is performed, this is a direct road to early wear.
How to diagnose
There are some rules of behavior that may indicate whether rear brake discs need to be replaced or not. Particular attention should be paid to these symptoms, because safety depends on them.
The first thing to say about wear is locking the rear brakes when you press the brake pedal. You can also find out about the failure of the brake disc by the characteristic rattle when you press the pedal. In addition, during braking, vibrations, jerks and other sounds that previously were not present can occur. You can also see the degree of wear visually - chips, cracks, sides are visible on worn brake discs. It is quite possible to carry out diagnostics with your own hands using a measuring tool. For example, the rear brake discs (Megan 2nd generation including) have a nominal thickness of 8 mm. As for the minimum figure, the manufacturer claims that it is 7 mm.
Diagnostics can be done right in the garage, but you must first remove the wheels. Next, replacement, repair or a trip to the service station. If the rear brake disc has a defect such as uneven thickness, then a groove can be made to thereby restore it. If surface destruction is observed, only the replacement of the component under consideration will save.
Restore or change?
When it is possible to find out the degree of wear (or if you noticed that the brake pedal twitches when braking), the car owner faces the following question: replace a damaged part or try to repair it? Many are trying to implement the second option. It must be remembered that you can grind a disk, but only if the residual thickness is four or more millimeters.
Service center experts recommend replacing the rear brake discs (Ford is no exception). However, if the price of a new part seems too high, you can try to repair it yourself.
It is important not to forget that the larger the metal layer will be removed during the repair, the less will be the life of the described part. Also, experts do not recommend installing contract disks. In this case, you will not have accurate data on where they were installed, how they were used, and the like. They may also have to be repaired soon.
How to restore brake discs
There are no difficulties with the repair of the front elements - they are pumped without removing from the car (if it is with front-wheel drive). Start the engine and with a special tool process the working surface of the part. If you have special equipment, you can also grind the Kia-Sorento rear brake disc. The rear wheel is removed, then the car rises on the jack. Further, the device through the device is fixed to the wheel bolt and sets the disk to rotate. Using another device that is attached to the caliper, the groove itself is performed.
You can also perform this procedure on a lathe. But then you have to remove the disk and carry it to the turner. As a result, we get the most even and smooth surface. However, after mounting the disc on a car, runout 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, purchase original products. It is important that when replacing on the rear axle two discs change at once. It is also recommended to install new pads. Ideally, if the discs and pads will be from the same brand. Some car owners with a desire to save money do not change the pads for new ones, performing a replacement disk. This will subsequently lead to rapid wear of the element and the appearance of grooves on it.
Replacement tool
To work, you need several tools. This is a standard set of keys and heads, a jack, a balloon key. A pit or overpass, a tripod for fixing the car, wheel chocks, and wire will not be superfluous.
Best if this operation will be performed with an assistant. This will greatly accelerate the process of replacing the rear disc in a garage environment. Before you begin the dismantling, you should find out whether you need self-locking bolts, or you can do the usual ones.
How to replace the brake disc with your own hands
If you exclude some design features of various makes and models of cars, the technology for dismantling and replacing the rear wheels is the same for all cars.
Let's see how you can independently replace the rear brake discs of the Renault Megane. The front and rear of the vehicle must be secured with wheel chocks. Then jack up the back of the machine. Before removing the disc, dismantle the operating point and press the piston on the working cylinder. The hub must be thoroughly cleaned of dirt. This action will allow not to change the wheel bearing in the future (but if it was already humming, 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 brake disc mounting bolts.
Then the brake caliper is removed and fixed with a wire. This is done so that the hose on the brake system is not damaged. Then the caliper assembly is disassembled - the pads, springs and the bracket are removed. They fix the hub, completely unscrew the bolts and, finally, remove the disk. To install a new one, you need to do all these operations in reverse order. The main thing is not to forget to install new pads. After replacing, be sure to bleed the brakes. There should not be airiness in the system. Otherwise, using such a car is simply dangerous.
Conclusion
We examined how to repair or replace the rear brake disc with our own hands. This is not the most difficult operation performed when servicing a car. Care must be taken to any parts of the brake system, because road safety depends on it.