With Duo-Servo Drum Brakes

REMOVAL PROCEDURE
GM replacement brake lining 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 lining material with performance different from that of GM replacement parts recommended for this vehicle can change the intended brake balance of this vehicle.

1. Raise the vehicle and support the vehicle with safety stands.





2. Mark the relationship of the wheel to the hub.
3. Remove the tire.
4. Remove the wheel.
5. Mark the relationship of the drum to the axle.
6. Remove the drum.





7. Remove the return springs.





8. Remove the shoe guide.





9. Remove the hold down springs.





10. Remove the hold down pins.
11. Disconnect the actuator lever and the lever pivot.
12. Remove the lever return spring.
13. Remove the actuator link.





14. Disconnect the parking brake strut and the strut spring.
15. Remove the parking brake lever.





16. Remove the adjusting screw assembly.
17. Remove the screw spring.
18. Inspect all parts for discoloration due to heat or stress. Replace as needed.
19. Inspect all parts for signs of wear. Replace as needed.
20. Inspect the wheel cylinder for signs of leakage.
21. Inspect the brake drum for scoring and machining tolerance.

INSTALLATION PROCEDURE

Important: Do not interchange the right and the left adjusting screws.





1. Lubricate the shoe pads and adjusting screw threads with a thin coat of white lithium grease or equivalent.





2. Install the adjusting screw assembly and the adjusting screw spring to both shoes. The coils of the adjusting screw spring must not touch the adjusting screw.
3. Connect the shoe assembly to the backing plate.





4. Install the parking brake lever.





5. Install the strut spring onto the parking brake strut.
6. Install the parking brake strut.





7. Connect the actuator lever and the lever pivot.





8. Install the actuator link.





9. Install the lever return spring.
10. Install the hold down pins.
11. Install the hold down springs.





12. Install the shoe guide.





13. Install the return springs.
14. Install the drum. Align the marks made during disassembly.
15. Install the tire and the wheel. Align the marks made during disassembly.
16. Adjust the rear brakes.