2010 Mercedes
Benz C 63 AMG Sedan (204.077) V8-6.3L (156.985)
Vehicle: Customer Interest
Brakes - Squeak, Scrape, Or Rattle From Rear Brakes
Squeaking, scraping or rattling noises from area of rear wheel brake without
brake actuation
Topic number LI42.20-P-052990
Version 1
Design group 42.20 Parking brake
Date 01-17-2012
Validity Model 204/207
Reason for change
Complaint:
Squeaking, scraping or rattling noises from area of rear wheel brake without
brake actuation.
Attachments
Cause:
1. Brake shoes of the parking brake touch the inside of the brake disk bowl
in the axial direction.
The brake shoes of the parking brake are fastened to the cover panel with
retaining springs. These retaining springs must be centered on the elongated
holes in the brake shoes. If this is not the case, the affected brake shoe may
touch the lip of the brake disk bowl in the axial direction and cause noises
(see attachment 1).
2. Stator clip has slipped and touches the inside of the brake disk bowl in
the axial direction.
A stator clip is pushed onto the support for the brake shoes of the parking
brake (brake stator). This prevents the brake shoes from working into the
aluminum wheel carrier. If this clip is pushed too far on during assembly, it
may be widened in the radius area of the brake stator (see attachment 2, item
3). This widening means that permanent secure fastening of the stator clip is no
longer guaranteed and it may wander from the brake stator in the axial direction
until it touches the lip of the brake disk bowl.
3. Expansion lock has play.
The expansion lock is designed to have sufficient component tolerance to
guarantee proper functioning of the parking brake even when covered with brake
dust deposits in the course of operation. This play can cause rattling noises on
rough roads.
Remedy:
Re. 1. Brake shoes:
Replacement of the silver-colored brake shoe retaining springs installed as
standard for black retaining springs (see parts ordering note).
When installing the retaining springs, the following points must be
observed:
^Use of installation tool W 112 589 09 61 00 (see attachment 3).
^ Insert the retaining springs through the cutouts in the rear axle shaft
flange so that they can be mounted vertically on the brake shoes (see
attachment 4).
^ Center the retaining springs on the elongated holes in the brake shoes (see
attachment 5).
^ To hook up the retaining springs in the cover panel, turn them
counterclockwise (to the left) to prevent tilting and to avoid stresses.
Re. 2. Stator clip:
Check the stator clip for abrasion marks and correct seating on the brake
stator (see attachment 2, item 1: The sides of the stator clip must be flush
with the brake stator). If abrasion marks are visible on the stator clip, or if
it is installed incorrectly, the stator clip must be replaced.
Re. 3. Expansion lock:
Install an additional snap clip between the extension spring and the
expansion lock as per the installation note (see attachment 6, Figure 1).
When installing, please not:
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2010 Mercedes
Benz C 63 AMG Sedan (204.077) V8-6.3L (156.985)
^ Position the snap clip in the center of the extension spring and make sure
that it engages properly in the extension spring (see attachment 6,
Figure 2).
Attachments
Symptoms
Parts
Attachment 1
Attachment 2
Attachment 3
Attachment 4
Attachment 5
Attachment 6
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