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What are the reasons for a car's brake pedal being hard to press down and how to solve it?

1 Answers

StJasper

07/29/25 8:25pm

Brake pedal being hard to press down is due to a vacuum booster pump air leak or malfunction, or pressing the brake after the engine has stalled. Explanation of reasons: If the car's vacuum booster pump has an air leak or malfunctions, the force applied to the brake pedal is normally amplified by the brake booster pump. If it fails, the brake loses its power assistance, making the pedal hard to press down. Alternatively, pressing the brake after the engine has stalled is not a malfunction. Solutions: If the vacuum booster pump has an air leak or malfunctions, it can cause brake drag, and in severe cases, brake failure, significantly impacting driving safety. It is necessary to promptly repair or replace the vacuum booster pump. Additionally, a vacuum booster pump air leak or malfunction can lead to heavy steering and steering noise, with louder sounds at lower speeds and larger steering angles. If the brake is pressed after the engine has stalled, since the engine is not running, only the remaining vacuum assistance is available. Pressing the brake again will deplete the stored vacuum, making the pedal hard to press down. However, this situation will resolve itself after the vehicle is restarted, requiring no further action.

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