Also known as "brake master cylinder" and "brake master cylinder", it is the main part of the vehicle braking system. According to different vehicles, it is divided into two types: air brake master cylinder and oil brake master cylinder. In general, the brake master cylinder of passenger cars uses an oil brake master cylinder, while commercial vehicles (such as trucks, buses, tractors) Etc.) The brake master cylinder generally uses an air brake master cylinder.
The function of the brake master cylinder
The main function of the brake master cylinder is to provide a brake boost. The brake boost effect is only available after the vehicle engine is started. The main oil brake master cylinder is a vacuum booster pump. When the master cylinder is boosted, the driver can step on the brake pedal. Easily, if the car does not start the engine, the driver usually has a hard time stepping on it after a few feet. It can be seen that once the brake master cylinder is broken, the normal braking function will be affected.
The performance of the brake master cylinder broken
1. There is oil leakage at the joint or limit screw of the brake master cylinder and the vacuum booster;
2. After the brake pedal is stepped on to the end, the brake is still bad or invalid;
3. It feels soft when stepping on the brake pedal;
4. Runoff after braking;
5. The brake suddenly fails;
6. The brake pedal does not return or returns slowly;
The fault performance and solution of the air leakage of the brake master cylinder
We can use a simple method to determine whether the brake master cylinder is leaking, let the car go idle for a few minutes, turn off the engine, and step on the brake pedal several times. Each time you step on it, there will be a change. The first time the stroke is the longest, and then gradually becomes Short, if there is no change, there is a problem.
The maintenance method for the leakage of the brake master cylinder is generally to disassemble and clean, check whether the air closing valve is damaged, and install it with a little butter. In addition, installing air filter elements on the two air pipes of the master cylinder can solve the problem of the master cylinder. For air leaks, buy a repair kit for the master cylinder of the same model. If the leather cup of the master cylinder is leaking, just replace it directly.