Why is the brake hard when starting the car overnight?

1 Answers
DanielFitz
07/30/25 4:32am
The reasons for the hard brake when starting the car overnight include a lack of vacuum in the vacuum booster pump or air leakage/damage in the vacuum booster pump. Lack of vacuum: When there is no vacuum in the vacuum booster pump of the brake system, the vacuum booster pump cannot function properly, resulting in the brake pedal being hard to press. Air leakage or damage in the vacuum booster pump: If the sealing ring of the vacuum booster pump is worn or lacks elasticity, it should be replaced promptly. If there is air leakage in the pipeline of the vacuum booster pump, the leaking pipeline must be replaced. If the interface of the vacuum booster pump is loose or damaged, it needs to be addressed accordingly.
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