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What's Wrong with the Vacuum Booster Brake System?

2 Answers

NathanMarie

08/26/25 2:46am

Possible causes of failure in the automotive vacuum booster brake system: vacuum pressure sensor failure, SB06 fuse failure, vacuum line leakage, vacuum pump circuit failure, vacuum pump failure, or failure of the vacuum booster brake system control unit (VBU) itself or its circuit. Below are specific diagnostic methods: 1. When the vacuum booster brake system fails, it usually triggers a fault code and illuminates the warning light. Therefore, the first step is to observe the fault information displayed on the dashboard and connect a diagnostic tool to read the fault code and data stream. 2. With the vehicle stationary, turn on the ignition switch and press the brake pedal 1–3 times. Observe the status of the vacuum pump to determine whether the brake system is functioning normally. 3. While the brake vacuum pump is operating, check the connecting hoses for air leaks and inspect all air tube connections for damage or leakage. The brake hoses must not be twisted, and at maximum steering angles, they must not come into contact with any vehicle components.

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MacBlakely

09/08/25 2:49am

I've encountered vacuum-assisted brake system failures many times in the workshop. Most cases are caused by vacuum line leaks or booster pump issues. Simply put, vacuum assistance uses engine-generated negative pressure to help us brake easily. If there are cracks in the lines, loose connections, or a damaged booster pump, it can make the brake pedal stiff, requiring more force to brake. Once during a repair, a customer complained that braking felt like stepping on a rock. Upon inspection, we found a clogged check valve - when this gets dirty or leaks, the negative pressure becomes insufficient. Additionally, unstable engine operation or aged vacuum lines can also affect performance, as rubber components may crack over time. My advice is to first check the vacuum pump and lines for obvious cracks or looseness. However, it's best to have a professional shop test with a vacuum gauge. Don't tamper with it yourself, as this involves driving safety. Address any issues immediately if found.

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