What are the symptoms of a faulty brake booster?

1 Answers
LaCamille
07/30/25 8:27am
It will trigger the warning light, and the brake pedal will feel very soft when pressed. In severe cases, the braking function may be completely lost. The brake booster, also known as the vacuum booster pump, is detailed below: 1. Function: The vacuum booster pump utilizes the vacuum generated by the engine during operation to provide assistance to the driver when braking, making the pedal feel lighter. If the vacuum booster pump is damaged, there will be no assistance, making the brake pedal feel heavy. Generally, the vacuum pump cannot be repaired and must be replaced. Its internal structure consists of a piston (with an O-ring seal) and a cylinder. It works by using the engine's intake vacuum to assist in braking. No special lubrication is required. 2. Booster Pump: The brake booster pump is a large-diameter vacuum chamber with a diaphragm in the middle that contains a push rod, dividing the chamber into two parts. One part is connected to the atmosphere, and the other is connected to the engine's intake manifold via a pipe. Therefore, when the engine is turned off, there is no intake vacuum, and thus no assistance, requiring significantly more human effort for braking.
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