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What are the symptoms of a faulty car vacuum pump?

1 Answers

KaydenAnn

07/30/25 9:48am

When a car's vacuum pump fails, the symptoms include poor or no braking performance; visible oil leakage at the external connections of the vacuum pump; and slow or non-returning brake pedal. Detailed explanations are as follows: 1. Function: The vacuum booster pump utilizes the vacuum generated during engine operation to provide assistance when the driver presses the brake pedal, making braking easier. If the vacuum booster pump is damaged, there will be no assistance, making the brake pedal harder to press. Generally, the vacuum pump cannot be repaired and must be replaced. Its internal structure consists of a piston (with an O-ring seal) and a cylinder. It works by utilizing the engine's intake vacuum to assist braking. No additional lubrication is required. 2. Booster Pump: The brake booster pump is a large-diameter vacuum chamber with a diaphragm in the middle that has a push rod, dividing the chamber into two parts—one connected to the atmosphere and the other linked to the engine intake manifold via a pipe. Therefore, when the engine is off, there is no intake vacuum, resulting in no assistance, and the effort required for braking will be significantly higher.

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