Brake Pads - Resonance Vibrations

SECTION
5

GROUP
51

NO.
803

DATE
Aug. 1996

New shims to minimize resonance vibrations, rear

850

REFERENCE:

TP 5001201, SECTION 5, BRAKES (INCL. ABS AND TRACS); 850 1992-
TP 5002202, SECTION 5 (50, 52, 55, 59) BRAKES (INCL. ABS AND TRACS); 850 1996

New shims to minimize resonance vibrations, rear

If a customer complains of resonant vibrations from the rear of the car when braking at low speed (frequently when the brake discs are hot after repeated braking), the problem can be fixed by replacing the shims. A kit with a new type of shim has been produced for the rear brake calipers. The kit has P/N 272272-6 (kit contains 4 shims).

(Resonant vibrations are experienced usually when the car has new rear brake discs/pads).

The service manual referred to in this service bulletin is the Service Manual Section 5
Brakes (incl. ABS and TRACS) 850 1992- TP 5001201 or
Brakes (incl. ABS and TRACS) 850 1996- TP 5002202





Method

Before replacing the shims the brake pads must be removed.

Remove rear wheels.





Removing brake pads
- Push out split pins with a 3 mm (0.12") punch.
- Remove retaining spring.
- Remove brake pads and shims.

Use puller 9992917-6 if brake pads will not come out easily.

Cleaning and checking
- Clean brake pad contact surfaces in brake caliper.
- Check piston boot.
- If piston boot looks worn, replace it as a precautionary measure.
- If the piston boot is damaged, recondition the brake caliper according to Service Manual section KD, (or PPP) "Disc brake caliper rear, recondition".





- Press pistons back with a adjustable pliers (A) (water pump pliers) or press tool 9992809-5. Take care to avoid damaging piston boot.
- Check that piston boot is in the proper position.





Installing the shims
- Grease the shims on both sides with a thin layer of silicon grease, P/N 1161325-4.
- The new type of shims has a cut-out. The shims must be installed with the cut-out facing down in the disc brake caliper as shown.





Installing brake pads
- Install brake pads.
- Install one split pin and retaining spring first, then the other split pin.

WARRANTY STATEMENT: Claims may be submitted under the New Car Limited Warranty when there is a documented customer complaint for brake resonance using claim type: 01

Operation No. Labor description Time allowance

51913-2 Shims rear brakes installation 0.5 hr