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      11-30-2012, 01:25 AM   #7
XavVD
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Drives: 125i M Sport (soon)
Join Date: May 2012
Location: Europe

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Quote:
Originally Posted by ovekvam
Quote:
Originally Posted by XavVD View Post
For the brake squeal noise, that is due to parking brake. My dealer finds it normal but I do not agree. If you park without parking brake, e.g. With 1st gear engaged, the noise will disappear. In any case the noise lasts only few brakes and then it is gone, at least in my case...
How can the parking brake be involved in making any noise when you are stopping? You don't apply the parking brake until you are stationary.
From my understanding, parking brakes generally use the rear caliper but activate them mechanically and not hydraulically. Then how the noise potentially occurs, no clear idea but I would suspect that caliper can get a bit of free play that generates some squeal noise (under low force braking) and after a few braking actions caliper has absorbed this free play (centering of shim in a pin/piston, shim getting perfectly perpendicular to pin/piston ???). Perhaps as parking brake is applied mechanically (in parallel to normal hydraulic brake system) force to caliper is applied at different location and not perfectly in uniform way that generates some shim slanting that is corrected after a few brake actions. Any brake specialist to confirm???
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