What Causes the Brake Pedal to Be Too Hard to Press Down?

1 Answers
SanIsla
07/29/25 4:53pm
Here are the specific reasons why the brake pedal may become too hard to press down while driving: 1. Loss of vacuum in the booster pump: The sudden hardening of the brake pedal could be due to the driver pressing the brake after turning off the engine, causing the vacuum in the brake booster pump to disappear. When the engine is off, the booster pump does not function. Try restarting the engine and firmly pressing the brake pedal; normal function should resume after startup. 2. Brake booster pump air leak: If there is an air leak in the vehicle's brake booster pump or a component failure, the driver will feel that the brake pedal is very hard to press due to the loss of assist, making it extremely strenuous.
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