What Causes the Brake Pedal to Be Hard to Press When Starting the Car?

1 Answers
LaCharlotte
07/30/25 7:47am
Introduction to the reasons why the brake pedal is hard to press when starting the car: Vacuum booster pump leaks or malfunctions: It is important to know that the force applied to the brake pedal is amplified by the brake booster pump. If it fails, the brake loses its main force, making it difficult to press down. Brake booster pump: The brake booster pump continuously generates vacuum only when the engine is running. When the engine is not running, it relies on the residual vacuum assistance, which usually depletes after a few presses. However, this condition will recover after starting and is not a malfunction. Lack of necessary maintenance for the brake system: Excessive impurities in the brake master cylinder, poor sealing, failure of the vacuum booster pump, dirty brake fluid or mixing different types of brake fluid causing vapor lock when heated, leakage in the brake master cylinder or wheel cylinders, or leaks in the air reservoir or pipeline connections.
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