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Why can't I engage the automatic parking brake on my Mercedes-Benz?

2 Answers

Darren

07/28/25 6:10pm

Mercedes-Benz automatic parking brake cannot be engaged due to improper foot technique and lack of adaptation, which can be resolved with more practice. Below is relevant information about automatic parking brakes: 1. Definition: Traditional handbrakes require the driver to manually release the brake or skillfully coordinate the clutch and throttle for smooth starts on slopes. The automatic parking brake function uses a slope sensor to provide precise braking force via the controller. During startup, the parking control unit calculates data from the clutch distance sensor, clutch engagement speed sensor, throttle pedal sensor, etc. When the driving force exceeds the running resistance, the parking brake is automatically released, allowing the car to start smoothly. However, it is best to turn off this function during low-speed parking to avoid frequent activation. 2. Function: It simplifies operations by eliminating the need for manual or electronic handbrakes, and automatic transmission models do not need to frequently switch between D to N or D to P.

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AniyahDella

08/11/25 11:59pm

I recently encountered a situation where the automatic parking brake on my Mercedes couldn't be pressed, and I spent quite some time figuring out the reason. It might be because the system wasn't properly activated, so check if the Auto Hold button on the dashboard is turned on or go into the vehicle settings to confirm it's enabled. Also, check whether the seatbelt is fastened and the doors are properly closed—these are safety conditions, and if they're not met, the system won't allow the pedal to be pressed. If all conditions are met and it still doesn't work, try pressing the brake pedal firmly a few times or turn off the engine and wait for a minute before restarting. Sometimes, it's just a minor software glitch, and a reset will fix it. However, if the problem occurs frequently, be wary of potential issues with the brake sensor or aging wiring, and it's advisable to visit a professional shop for diagnosis immediately to avoid accidents like rolling back on slopes. Safe driving is not something to be careless about.

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