Why does the electronic brake vacuum pump make noise when braking?

1 Answers
LaKhloe
07/30/25 7:32am
Electronic brake vacuum pump makes noise when braking because electric vehicles lack an engine, reducing the vacuum source originally provided by the engine intake manifold, necessitating the addition of an electric vacuum pump. Here are some extended details: 1. Function: It mainly extracts air from the vacuum booster in the braking system to enable the booster to provide actual assistance. Therefore, braking consumes the vacuum source inside the vacuum booster. 2. Reduced vacuum level: When the vacuum pressure sensor detects a decrease in the vacuum level inside the booster, it activates the vacuum pump, causing it to work and produce noise. Each brake application consumes vacuum, so every time the brake is pressed, the vacuum pump operates.
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