Why Can't the Brake Be Depressed and the Car Won't Start?

1 Answers
DeElliott
07/30/25 9:44am
Here are the reasons why the brake can't be depressed and the car won't start: 1. Vacuum booster pump leakage: If the car's vacuum booster pump leaks or malfunctions, the force required to depress the brake pedal increases. If it fails, the brake loses its power assistance, making it very hard to depress. 2. Normal phenomenon: The inability to depress the brake after the engine is turned off is 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 will be restored after starting, and this is not a fault. Extension: In car driving, to prevent unexpected situations like sudden movement or rolling when starting the vehicle, automatic transmission models are designed to require the brake to be depressed for ignition. If the brake is not depressed, the car cannot successfully start. Additionally, the gear must be in P (Park) or N (Neutral) when starting an automatic transmission car. Starting in N without the handbrake engaged can cause the car to roll, so the 'depress brake to start' design is entirely for safety considerations.
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