Why is the functional range of the Mercedes Active Brake Assist system limited?

2 Answers
VanNicole
09/08/25 5:16am
Possible reasons for the "Active Brake Assist system functional range limitation": The radar sensor system may temporarily stop functioning due to interference from electromagnetic radiation emitted by nearby TV stations, radio stations, or other electromagnetic radiation sources; the system may be operating outside its working temperature range; or the vehicle voltage may be too low. Here is some relevant information: Other causes: The functional range limitation of the Active Brake Assist system may also be caused by heavy rain or snow impairing its function, or the radar sensor system malfunctioning due to dirt on the sensor. If the front radar sensor system is dirty, the Active Blind Spot Assist system will attempt to correct the driving path with braking and will also emit a warning sound. When the cause of the problem no longer exists, the driving system and driving safety systems will become available again. Additional information: The display message will disappear automatically, and the Active Brake Assist system will resume operation. If the display message does not disappear, you can stop the vehicle and restart the engine, paying attention to road and traffic conditions when stopping.
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OGianna
09/20/25 3:54am
I encountered a restricted functionality issue with the Active Brake Assist system while driving my Mercedes-Benz. The warning light came on after a long highway trip. The possible causes were that the radar sensor on the front bumper was covered by bugs or mud, preventing the system from accurately detecting obstacles ahead. It could also have been due to rainy and slippery road conditions, causing the camera to blur and affecting its judgment. I found that cleaning the sensor resolved the issue, but sometimes a system restart or connecting a diagnostic tool for a software update was necessary. This system is crucial as it can automatically apply the brakes to prevent collisions. When it was restricted, I noticed the brake response became sluggish, so I drove more cautiously and maintained a greater distance. I recommend paying attention to cleaning the grille area during regular car washes to avoid similar malfunctions affecting safety.
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