My automatic W203 has developed a funny noise when the brake pedal is released, it sounds like a high pitched whine rather that a squeak, it feels like it could be an audible warning alarm. It goes off after a while or if I tap the brake pedal again. Any ideas anyone?
W203 - brake pedal - whine/alarm noise
miro
MB Enthusiast
Parking brake return spring sounds plausible.
miro
MB Enthusiast
How do you know it is unrelated ? Is the noise coming from the front ?
It sounds like it's coming from above the brake pedal, it starts when I release the brake pedal, it stops if I dab the brake pedal again. It does actual sound like a low volume high pitched alarm... but it does seem to be centered around the brake pedal.
Dieselman
Banned
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Servo vacuum valve.
miro
MB Enthusiast
How do you intend to fix it yourself ?
I came across this article as I was browsing (as you do)
Complaint
When the depressed brake pedal is released, a squeaking or whistling noise can occasionally be heard.
Cause
The whistling noise is produced in the brake booster. It is caused when the brake pedal is released when the working and vacuum chambers in the brake booster are connected together. Pressure equalization occurs between the two chambers, with air flowing from the working chamber into the vacuum chamber.
In the process, the air flows around an edge, which produces vortices. These vortices can be heard as a whistling noise if tolerances are unfavorable.
Remedy
Replace brake booster.
The brake booster has been modified to prevent this whistling noise from occurring.
Perhaps it may help
Joe
Complaint
When the depressed brake pedal is released, a squeaking or whistling noise can occasionally be heard.
Cause
The whistling noise is produced in the brake booster. It is caused when the brake pedal is released when the working and vacuum chambers in the brake booster are connected together. Pressure equalization occurs between the two chambers, with air flowing from the working chamber into the vacuum chamber.
In the process, the air flows around an edge, which produces vortices. These vortices can be heard as a whistling noise if tolerances are unfavorable.
Remedy
Replace brake booster.
The brake booster has been modified to prevent this whistling noise from occurring.
Perhaps it may help
Joe
miro
MB Enthusiast
Brakes, airbags and horns are a no go zone for DIY. It is much too dangerous if you make a mistake. Make sure you take it to a garage.
I have a new W203 booster in hand. Let me know if you need it.
Olympuss
New Member
Have the replacing of the brake booster resolve your problem?
I have the same problem.
I have the same problem.
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Have the replacing of the brake booster resolve your problem?
I have the same problem.
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Welcome Olympuss.
Did you get the fault codes read with STAR (or iCarsoft)?
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