StephOtt

Mercedes GLE Hybrid Brake Booster Issue

My 2020 Mercedes GLE hybrid is showing a brake booster pressure sensor failure around 252270 km. The speedometer shows an error, and braking is diminished. Diagnostics confirm an error is stored. Could an incorrectly bled brake system cause this? Vehicle safety is a concern

A 2020 Mercedes GLE hybrid exhibited a brake booster pressure sensor failure, resulting in diminished braking and a speedometer error. The issue was suspected to be caused by an incorrectly bled brake system. Diagnostics confirmed the error, and it was advised to consult a workshop for repair. The workshop confirmed the incorrect bleeding as the cause, and the issue was resolved.

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4 comment(s)

I had a similar issue on my GLE. Your symptoms mirror my experience. The error message and diminished braking are unnerving. I am not a mechanic, but I read that improper brake bleeding can affect the brake booster pressure sensor. The sensor could also have failed. Review your brake system maintenance history, specifically when it was last bled. This might provide a clue

Thanks for your response. How soon after the last bleed did you notice the problem on your vehicle? I am trying to establish a timeline to help figure out what happened

If I recall, the issue surfaced about a week after the brake bleed. Given the potential impact on vehicle safety, and the diagnostic tools already showing an error, I advise consulting with a qualified workshop to diagnose and fix the brake booster pressure sensor fault. Driving with a compromised brake system is inadvisable. This issue could lead to bigger brake system problems

I appreciate the advice. I took the vehicle to a workshop, and the diagnostic proved your theory correct: the brake system was bled incorrectly, leading to the pressure sensor failure. The repair cost was 90€ Thanks for your help

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MERCEDES

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GLE