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What are the symptoms of a bad brake pump?

2 Answers

LaMartin

07/28/25 11:54pm

Here are the symptoms of a faulty brake vacuum pump: 1. No braking effect: Poor braking performance or no braking effect at all; 2. Oil leakage: Visible oil leakage at the external connections of the vacuum pump; 3. Brake pedal not returning: The brake pedal returns slowly or does not return at all; 4. Abnormal noise: A noticeable abnormal noise can be heard when the brake pedal is pressed; 5. Braking direction deviation: The vehicle pulls to one side or vibrates when braking. Additional information: The brake vacuum pump, also known as the brake booster pump, controls the vacuum entering the booster pump during braking. It moves the diaphragm and uses the pushrod on the diaphragm through a linkage device to assist the driver in pressing and pushing the brake pedal, thereby amplifying the force applied by the driver.

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CoreyLee

08/12/25 4:12am

I've experienced issues with the brake master cylinder, and that feeling was truly nerve-wracking. The first time I noticed it, the brake pedal felt spongy, like stepping on cotton—it sank deeply but the car wouldn't stop. The speed dropped slowly, and I almost rear-ended another car at a red light. Later, during inspection, I found traces of oil leakage in the engine bay—it was brake fluid seeping out, and the reservoir was nearly empty. This kind of problem can't be delayed because the braking effect almost fails, making it extremely dangerous at higher speeds. After that incident, I developed a habit of checking the brake system monthly, replacing old components promptly to prevent similar situations.

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Is It Harmful to Rev the Engine in Neutral for a Manual Transmission Car?

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