Disc Brake System: By Symptom
Brakes - Front/Rear Brakes Squeal
Date: September 20, 2007
Order No.: P-B-42.10/79
Supercedes:
Group: 42
SUBJECT:
Model 171.454/456
All Model 203 Vehicles
Model 209.356/365/372/375/376/456/465/472/475/476/477
All Model 211 Vehicles
Model 215.374/375/376/379
All Model 219 Vehicles
Model 220.067/170/174/175/176/178/179/183/184
Model 230.471/474/475/476/477/479
Front / Rear Brakes Squeal When Braking
If you receive customer reports in the above model vehicles where either the front and/or rear brakes squeal, perform the following to resolve.
Note:
^ Bed in the brake pads in the course of a normal road test if new brake pads are installed. Do not perform any special "bedding-in"
operations.
^ Brake squeal does not usually necessitate the replacement of the brake disks. The only time the brake disks can potentially be the cause
of the brake squeal is when it is seriously warped or heavily scored.
^ A damping plate is adhered to the backing plate of the brake pads. This adhered joint must fix the damping plate to the backing plate over its entire surface area in order to guarantee effective noise damping. If the adhered joint has become partially or entirely detached and the damping plate can be lifted off as a result, the brake pads must be replaced.
^ If the brake pads exhibit signs of excessive heat (white or red discoloration at the edges), this is due to excessively high thermal stress on the brakes (perhaps as a result of a misuse). In this case, the brake pads must be replaced because satisfactory noise damping can no longer be guaranteed.
Front Brakes
1. Reproduce squealing noises when braking and ensure that the squealing noise is coming from the front wheel brake.
Note:
For vehicles with 4-piston fixed caliper brake on the front axle, continue and perform steps 2 through 4. For all other brake variants, resume with step 5.
2. Check the version of the brake pads by comparing the designation number engraved on the backing plate (Figure 1) with the parts information
table. Replace brake pads and install the latest version if necessary.
3. Check the version of the removable damping plate (silver colored) and replace if necessary. The current version of the damping plate has
semicircular cutouts.
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4. Check the version of the pressure spring. The current version of the pressure spring has retaining tabs (Figure 2). Replace the pressure spring
if necessary (corresponding to damage code 42116 36).
5. Check and see if the brake pads can be easily moved. Clean the brake pad guides if necessary.
6. Apply brake paste to the pads/caliper based on the information shown for the particular application.
7. If new pads were not installed and the problem still persists, replace the brake pads. Refer to EPC for the latest part number. Ensure to follow
the above instructions (step 6) for proper greasing location per application.
8. For Model 211/215/219/220/230 vehicles, install dampers in pistons of front brake calipers. Ensure that the rounded part of the piston
damper(s) is inserted first for 4-piston fixed caliper brakes (corresponding to damage code 42186 36).
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2007 Mercedes Benz SL 65 AMG (230.479) V12-6.0L Turbo (275.981)
Note:
Refer to the WIS documents shown above for instructions on replacing the brake pads.
Rear Brakes
1. Reproduce squealing noises when braking and ensure that the squealing noise is coming from the rear wheel brake.
2. Check and see if the brake pads can be easily moved. Clean the brake pad guides if necessary.
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Figure 3 and 4
3. Apply brake paste to the pads/caliper based on the table shown above for the particular application.
4. If the problem persists replace the brake pads, refer to EPC for the latest part number. Ensure to follow the above instructions (step 3) for
proper greasing location per application.
Note:
Refer to the WIS documents shown for instructions on replacing the brake pads.
Parts Information
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on September 20, 2007. Please refer to Netstar ?? Star TekInfo ?? Star Time for the most current labor time allowance.
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Warranty Information
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In Case of Warranty, use the table.
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