The rear brake disc has obviously worn grooves, is it affected? Do you need to deal with it?
There is an impact and it needs to be dealt with.
Scratches on the brake disc is a normal phenomenon, if there is a brake disc in the car scratches more serious than the other three, then there are hard metal particles in the brake disc matching with the brake disc, resulting in serious scratches on the disc.
Sometimes the brake contains hard metal particles, and any disc brake has scratches, which is a normal phenomenon. Because there is an uneven distribution of metal components in the brake pads there will be scratches, and then driving between the brake pads and the brake disc into the sand will cause the brake disc scratches, go to the repair shop to ask them to help you put the brake pads with 800 sandpaper sand.
Because there are hard metal particles in the brake pads under the sand, in fact, the brake pads are hard, or there are larger metal particles in the brake pads, and it is unnecessary to replace them from the point of view of use. If there is a sound when braking, you can go to the repair shop and sand it with 400 sandpaper. This is a normal phenomenon, either there is a foreign body between the brake pad and the brake disc, or there is a hard object in the brake pad material.
Extended data
The principle of the braking system is to create a large amount of friction, which converts the kinetic energy of the vehicle into heat. As we all know, energy can neither be created nor disappeared, it can only be transformed from one form to another, or transferred from one object to another, in the process of transformation or transfer, the total amount of energy does not change.
The car converts chemical energy into heat and kinetic energy during acceleration, and the braking system converts the kinetic energy of the car into heat energy and emits it into the air. The brake system consists of a control system, a hydraulic system and a power system.
The hydraulic system is composed of hydraulic oil, brake pump and hydraulic tubing. Hydraulic oil is the hydraulic medium used in the hydraulic system using liquid pressure energy, which plays the role of energy transfer, system lubrication, corrosion prevention, rust prevention and cooling in the hydraulic system.
For hydraulic oil, first of all, the hydraulic device should meet the requirements of liquid viscosity at the operating temperature and starting temperature, because the viscosity of the oil is directly related to the hydraulic action, transfer efficiency and transfer accuracy, but also requires the viscosity of the oil temperature performance and shear stability should meet the various needs of different uses.
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