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What are the reasons for the Golf's brake assist system being restricted and unable to start?

2 Answers

Connie

09/07/25 6:41am

Golf's brake assist system being restricted and unable to start, the reasons and solutions are as follows: Complex road conditions: For example, when encountering deep pits ahead, long steep downhill slopes, or obstacles such as pedestrians blocking the way, this prompt may also appear. Dirty radar: It may be caused by dirt on the surface of the radar probe in front of the interior rearview mirror or on the front windshield probe position of the vehicle. Cleaning it yourself can solve the problem. Damaged radar: The radar sensor is damaged. Check if the shape of the radar sensor is normal to ensure it is not damaged. Some models may have been involved in accidents. Braking failure: There may be a loophole in the active brake assist system or an actual fault in the braking system. Additionally, some owners experience this active brake assist system fault as a false trouble code. Going to the after-sales service for a reset and system upgrade can resolve the issue.

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Shannon

09/19/25 5:49am

The Golf may fail to start due to an issue with the brake booster system. If this system is restricted, it's normal for the entire vehicle to be unable to start. The most common causes are a leaking vacuum booster or a blocked pipeline. The car relies on engine vacuum to assist the brakes. If there's insufficient vacuum, the control module may misinterpret it as a system failure and directly lock the startup procedure. Another possibility is sensor failure, such as a faulty booster pressure sensor, which makes the computer think the brake system is unsafe and prevents ignition. Also, don't forget to check the battery and fuses, as low voltage or a blown fuse can trigger this warning. This issue is quite common in Golf models, especially those that have been driven for several years, as the rubber hoses tend to age and crack easily. I must remind you not to force-start the car, as it could be dangerous if the brakes truly fail. It's best to take it to a professional repair shop immediately. Usually, replacing the vacuum hose will solve the problem—don't skimp on such a small expense.

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