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Why Can't the Brake Pedal Be Depressed and the Vehicle Fails to Start?

1 Answers

HarmonyRose

07/30/25 2:19am

Brake pedal can't be depressed and the vehicle fails to start, the possible reasons may be the disappearance of vacuum in the brake booster pump or air leakage or component failure in the vehicle's brake booster pump. Below are the detailed explanations of the specific causes: Disappearance of vacuum in the brake booster pump: Because the owner stepped on the brake several times after parking, the vacuum in the brake booster pump disappeared, making it difficult to depress the brake pedal without assistance. The booster pump does not work when the engine is off, so the owner can try to start the engine again, press the brake pedal firmly, and it will return to normal after starting. Air leakage in the vehicle's brake booster pump: Due to air leakage or component failure in the vehicle's brake booster pump, the owner will feel very strenuous when stepping on the brake because the booster pump function is lost. If the owner still cannot restore normal operation after stepping on the brake several times, they should go to a nearby repair shop for inspection and continue driving only after the problem is resolved.

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