Dust and gas industry explosion-proof brake YWZ5-200/30 Hengyang Heavy Industry coking plant with

Diagnosing Vacuum Booster Faults

　　First check its sealing. Start the engine, accelerate to a medium speed (1500r/min or so), the engine off, together with the agile lift the accelerator pedal, so that the engine intake pipe school high vacuum. Engine off about 90 seconds later, step on the brake pedal, at this moment, if you can hear the vacuum booster neighbourhood there is a clear "hoo" of the intake sound, lift the brake pedal and then step on it, and can hear the sound of an intake, that the vacuum booster sealing is outstanding. Otherwise, the vacuum check valve is not tight, vacuum piping blockage or leakage, should be dismantled to repair.

　　After checking the sealing of the vacuum booster, then check its operating efficiency. In the engine off state, step on the brake pedal several times, exempt the vacuum in the booster pump. Then step on the brake pedal with appropriate force, and make the brake pedal to adhere to the motionless. Start the engine at this moment, if you can clearly feel the brake pedal down a distance, it is clarified that the vacuum booster in the effect. If you do not feel the brake pedal sinking or feeling is not obvious in the engine start moment, it is clarified that the vacuum booster has lost the booster effect, and should be further disassembled and repaired.