What is the fault when the BMW 5 Series has hard brakes and no power assistance?

1 Answers
DiIsabela
07/29/25 7:47pm
The cause of the fault is air leakage or failure of the vacuum booster pump. The following is an introduction to the brake booster pump: 1. Principle: During the braking process, the vacuum entering the booster pump is controlled to move the diaphragm, and through the linkage device, the push rod on the diaphragm is used to assist human force in stepping on and pushing the brake pedal, thereby amplifying the force exerted by the driver on the pedal. 2. Function: Utilizing the principle of air intake during engine operation, a vacuum is created on one side of the booster pump, forming a pressure difference relative to the normal air pressure on the other side. This pressure difference is used to enhance the braking thrust.
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