What causes the brake booster system to be restricted in a Golf?

2 Answers
DelMaggie
07/24/25 8:46am
For the Golf 7, if the brake booster system is restricted, check the vacuum pump or whether there are any air leaks in the piping. Another possible cause is the vacuum pressure sensor. The brake booster system is also known as the vacuum booster, although some models use an electric booster. If the brake booster system fails, you will feel that the brake pedal is harder to press when braking. The maintenance methods for the braking system are: 1. High-temperature resistance protection to prevent corrosion of the braking system, avoid brake pads seizing due to high temperatures, and eliminate brake pad squealing. 2. Clean the brake discs, brake drums, and any parts from oil stains, dirt, and friction dust to ensure good heat dissipation of the brake discs. 3. Regularly replace the brake fluid. 4. Regularly check the thickness of the brake pads or brake shoes.
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StSerenity
08/11/25 4:18am
Last time I drove my Golf, I experienced the brake assist becoming stiff. The repair shop said it was a problem with the vacuum pump. This car's vacuum system mainly relies on the vacuum pump to extract air. If it fails or the belt is loose, insufficient air extraction will make the brakes feel heavier. Another possibility is a leak in the vacuum hose—rubber hoses often crack and deteriorate over time. Additionally, the one-way valve might be stuck and fail to open, preventing the vacuum chamber from maintaining negative pressure. These faults will trigger the brake warning light on the dashboard. I recommend checking the vacuum pump for unusual noises and inspecting the hoses for cracks. Don’t wait until the problem becomes severe to fix it, as it’s a critical safety issue.
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