Brake Shoe: Service and Repair

GM replacement rear brake shoe material is recommended for all vehicles to maintain the balance between front and rear brake performance. GM replacement brake parts have been carefully selected to provide the proper brake balance for the purposes of stopping distance and control over the full range of operating conditions. Installation of front or rear brake material with performance different from that of GM replacement parts recommended for this vehicle can change the intended brake balance of the vehicle.

REMOVAL PROCEDURE

CAUTION: Avoid taking the following actions when you service wheel brake parts:

^ Do not grind brake linings.
^ Do not sand brake linings.
^ Do not clean wheel brake parts with a dry brush or with compressed air.

Some models or aftermarket brake parts may contain asbestos fibers which can become airborne in dust. Breathing dust with asbestos fibers may cause serious bodily harm. Use a water-dampened cloth in order to remove any dust on brake parts. Equipment is available commercially in order to perform this washing function. These wet methods prevent fibers from becoming airborne.

1. Raise the vehicle and support the vehicle with safety stands.
2. Remove the tire and the wheel.
3. Install the pin into the park brake lever.
4. Remove the rear brake drum.





5. Remove the rear brake shoe return springs (7 and 8).
6. Remove the hold-down springs (9).
7. Remove the hold-down pins (15).
8. Remove the shoe guide (3).
9. Remove the rear brake shoe actuator (11), and the spring (10).
10. Remove the rear brake shoe actuator link (6).
11. Remove the rear parking brake lever strut (4) and spring (2).
12. Remove the rear brake shoe adjuster spring (13).
13. Remove the rear brake shoe adjuster (12).
14. Remove the rear brake shoes (1 and 14).
15. Inspect all of the parts for discoloration due to heat or stress. Replace as needed.
16. Check for signs of wear. Replace as needed.
17. Inspect the rear brake cylinder for signs of leakage. If any is found, refer to Wheel Cylinder Overhaul.
18. Inspect the rear brake drum for scoring and machining tolerance.

INSTALLATION PROCEDURE
1. Lubricate the rear brake backing plate and the adjusting screw threads with a thin coat of white lithium grease.





2. Install the rear brake shoes (1 and 14).
3. Install the rear brake shoe adjuster (12).

IMPORTANT: Do not interchange the right and left brake shoe adjusting screws.

4. Install the rear brake shoe adjuster spring (13). The coils of the adjusting screw spring must not touch the adjusting screw.
5. Install the rear parking brake lever strut (4) and spring (2).
6. Install the rear brake shoe actuator link (6).
7. Install the rear brake shoe actuator (11) and spring (10).
8. Install the shoe guide (3).
9. Install the hold-down pins (15).
10. Install the hold-down springs (9).
11. Install the rear brake shoe return springs (7 and 8).
12. Install the rear brake drum to the vehicle.
13. Remove the pin to the park brake lever.
14. Install the tire and the wheel.
15. Adjust the rear brakes.
16. Adjust the parking brake.
17. Remove the safety stands. Lower the vehicle.