Front Brakes - Squeal

SECTION
5

GROUP
51

NO
909

DATE
July 1995

RE.:
Squeal from front brakes
700/900 with ABS 1991-
940/960 1992-

REFERENCE: TP 3083812, SECTION 5 (50, 51, 52, 55, 59), BRAKES (INCL. ABS); 700/900 1982-19..

Front brakes squeal

If a customer complains about front brakes squeal, anti-noise shims can be installed in the caliper as follows.

The shims will be introduced into production on new 960 models from 1996.

Materials: Shim kit P/N 272187-6

METHOD:

Raise the car and remove wheels Mark the position of the wheels if there is no locating stud.

Place stands under jacking points

Remove guide pin screw.

Raise the caliper and hook up with a wire





Remove brake pads.

Note
Do not depress the brake pedal with the brake pads removed!

Clean brake pad contact surfaces in the caliper.





Press back piston completely

Use water pump pliers. Take care not to damage its protective covering. Be sure to release the air trapped under the boot.

Piston stiffness may be due to oxidation. This is characterized by the piston not springing back when pressed in. In this case the caliper must be replaced.

Note
When pressing back the piston, the level in the brake fluid reservoir may rise causing brake fluid to spill out. Clean up spillages.

Check the piston dust seal

If dirt has penetrated the cylinder because of a damaged dust seal, the caliper must be reconditioned.

Check:

- that there is no rust between the guide plate and caliper retainer. Clean if required.




- the boot for sliding bolts. Replace if damaged. See reconditioning, page 43 in Service Manual

Section 5 (50, 51, 52, 55, 59)
Brakes
700/900 1982-19.. TP 30838/2.

INSTALL:




- Shims to upper section of brake pad back plate which contacts the piston in the caliper.

(A) = left wheel
(B) = right wheel

Install brake pads.




Note
The brake pad and shim should be in contact with the piston.

Fold back caliper.

Tighten lower guide pin bolt to 27 Nm (20 ft lbs). Use new screws.

Check the fluid level in the reservoir. Depress the brake pedal repeatedly.




Install wheels as marked.

Install wheel studs but do not tighten. Tighten in diagonal order to 85 Nm (63 ft lbs).

WARRANTY STATEMENT: Claims may be submitted under the New Car Limited Warranty once per vehicle when there is a documented complaint only using claim type: 01

OPERATION NO. LABOR DESCRIPTION TIME ALLOWANCE
51104-0 Front brake pad, replacement, 2 wheels 0.7 hrs