Why is the brake pedal so hard?

1 Answers
LeLeonardo
07/30/25 12:33am
It is mostly caused by a faulty vacuum booster pump, or there may be air leakage in the booster pump pipe. Below is an introduction to the issue of a hard brake pedal: 1. After turning off the engine, press the brake pedal several times with your foot, and it will become very hard and immovable. Then, after starting the engine, the brake pedal will soften and lower. If this happens, it indicates that the booster pump is working. If there is no issue, check the pipes for air leaks and also see if the brake fluid is low. 2. If the problem occurs occasionally and intermittently, it means the booster pump is damaged and needs to be replaced. If the pipe is broken, the brake pedal will remain hard regardless of whether the engine is off or running.
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