oliver_eis5

ML Diesel brake booster problem

Brake booster issue on my ML Diesel from 2003. It's done 174432 km. I'm getting a dash error about the brakes, and the braking feels weak. It needs a good stomp to stop. It's showing a fault about the brake booster pressure sensor. Could a dodgy brake bleed cause this? Any thoughts?

4 comment(s)

Weak brakes are scary. I had something similar on my ML, though I can't remember the code. Was the brake system recently bled? Trapped air can mess with the pressure and cause issues with hydraulic brakes. A bad bleed affects pedal feel, makes it spongy. Is the pedal soft? Did you check the brake lines? Is the brake fluid level normal?

The brake system was bled recently. The brake pedal feels softer than usual. Do you reckon it's likely just a bleeding issue and not the pressure sensor itself?

While it could still be the pressure sensor, a bad bleed is a prime suspect given the soft pedal and recent work. I'm not saying it's definitely the bleed, but it's the most likely cause. I'd recommend getting it checked by a professional. Vehicle safety is not something to gamble with.

Thanks for the advice. I took it to a workshop and you were spot on. They re-bled the brake system properly and that sorted it. Apparently, there was air trapped in the lines. The bill came to 90€, which I'm happy with considering the alternative. All working now, thanks again.

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