What's the reason when the brake pedal can't be pressed down and the car won't start?

1 Answers
SanKennedy
07/28/25 9:22pm
There are mainly the following reasons why the brake pedal can't be pressed down: 1. The car's vacuum booster pump is leaking or malfunctioning: The force to press the brake pedal needs to be amplified by the brake booster pump. If it fails, the brake loses its power assistance, making it very hard to press; 2. Difficulty pressing the brake after the engine is off, which is also related to the brake booster pump: The brake booster pump continuously generates vacuum only when the engine is running. When the engine is off, it relies on the residual vacuum assistance, which usually disappears after a few presses. However, this condition will recover after starting the engine and is not a malfunction.
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