What are the detection methods of vacuum booster?

Inspection method of vacuum booster: When checking the check valve of vacuum booster, blow compressed air in the direction of arrow on the valve body. Do not pass in the opposite direction. One-way passability can also be tested by suction method. When the check valve is poorly sealed, the vacuum tube assembly should be replaced.

Check whether the vacuum booster is in good condition can be judged by the following quick methods:

1, engine running 1-2min, then turn off the engine, and press the brake pedal several times according to normal force, so that the vacuum inside the vacuum booster is consumed. The vacuum booster can be completely depressed at first, and then the height of the brake pedal gradually increases, indicating that the vacuum booster works normally.

2. Start the engine, and if the brake pedal feels obvious automatic sinking (afterburner effect), it means that the vacuum booster functions normally; If the brake pedal doesn't respond and has no boosting effect, it means that the vacuum booster has failed and should be replaced. Replace the gasket when replacing the booster assembly. The tightening torque of the fixing nuts of booster assembly and brake master cylinder is 20N? m .

3. When the engine is running, press the brake pedal, and then turn off the engine. The height of the brake pedal does not change within 30 seconds, indicating that the vacuum booster works normally. If any of the above tests do not meet the requirements, check the damage of vacuum tubes, valves and boosters. The results of three tests all meet the requirements, indicating that the vacuum booster has good performance. (Photo/Text/Photo: Li Linwei) @20 19