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What are the symptoms of a leaking brake vacuum pump?

1 Answers

HavenLee

07/30/25 2:45am

The symptoms of a leaking brake vacuum pump include poor braking performance or no braking effect at all; visible oil leakage at the external connections of the vacuum pump; and slow or non-returning brake pedal. Excessively hard brake feel: When applying the brakes, if the brake feel is noticeably too hard, with each pedal stroke being very short, or even pushing the foot back, it is likely due to a leak in the brake vacuum pump, causing the vacuum pump's assist function to fail. Abnormal noises from the vacuum pump: Poor-quality vacuum pumps may produce noticeable abnormal noises, sometimes a "click" sound, and other times a "popping" sound, but these noises do not affect the car's braking performance. Brake pedal not returning or returning slowly: If after pressing the brake pedal, the pedal neither rises nor offers resistance, this is a sign of the brake not returning. In this case, it is necessary to check whether the brake vacuum pump, master cylinder, or wheel cylinder components are damaged. Additionally, this phenomenon could also be caused by a lack of brake fluid or oil leakage.

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