GM Chevy Mid-Size Cars 1964-1988 Repair Guide

Brake Shoes

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CAUTION
Brake shoes contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.

REMOVAL & INSTALLATION



See Figures 1 through 15

Maintenance procedures for the metallic lining option are the same as those for standard linings. Do not substitute these linings in standard drums, unless they have been honed to a 20 micro-inch finish and equipped with special heat resistant springs.

  1. Raise the rear of the vehicle and support safely using jackstands.
  2.  
  3. Slacken the parking brake cable by backing off the adjuster.
  4.  
  5. Remove the rear tire and wheel assemblies, then remove the and brake drums.
  6.  

Disassemble only one side at a time so that you may use the assembled side for reference during reassembly. Remember that the assembled side opposite the one you are working on will be a mirror image.

  1. Clean the brake components with a commercially available spray cleaner designed for brake systems.
  2.  

The primary (leading) shoe has a shorter lining than the secondary (trailing) shoe and is mounted at the front of the wheel.

  1. Free the brake shoe return springs, adjusting screw spring, trailing shoe hold-down pin and spring, the adjusting screw, then finally the actuator assembly, consisting of the actuating link, adjuster levers and lever return spring.
  2.  

Special tools available from auto supply stores will ease removal of the spring and anchor pin.

  1. Pull back on the secondary shoe, then remove the parking brake strut and strut spring.
  2.  
  3. Remove the secondary shoe and disengage the parking brake cable. If sufficient tension was not released from the parking brake cable, an assistant will be needed to pull back on the cable spring while you disengage the cable end from the shoe. Three pairs of hands and 2 pairs of pliers will make this job much easier.
  4.  
  5. Remove the hold-down pin and spring, then remove the primary shoe from the backing plate.
  6.  
  7. Check the wheel cylinders for seal condition and leaking.
  8.  

To install:
  1. Inspect the replacement shoes for nicks or burrs, lubricate the backing plate contact points, brake cable and levers, and adjusting screws. Begin assembly using the assembled side as a reference.
  2.  

Make sure that the right and left hand adjusting screws are not mixed. You can prevent this by working on one side at a time. This will also provide you with a reference for reassembly. The star wheel should be nearest to the secondary shoe when correctly installed.

  1. Position the primary shoe to the backing plate, then secure using the hold-down pin and spring.
  2.  
  3. Engage the parking brake cable to the bottom of the secondary shoe.
  4.  
  5. Position the parking brake strut and strut spring to the primary shoe, then place the secondary shoe in position and engage the strut.
  6.  
  7. Install the actuator assembly (actuating link, adjuster lever and lever return spring), then secure the assembly and secondary shoe using the hold-down pin and spring assembly.
  8.  
  9. Engage the actuating link, then install and secure the brake shoe return springs, adjuster screw assembly and the adjusting screw spring.
  10.  
  11. Install the brake drums, then install the rear tire and wheel assemblies.
  12.  
  13. Properly adjust the rear drum brakes, followed by the parking brake cable.
  14.  
  15. Remove the supports and carefully lower the vehicle.
  16.  



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Fig. Fig. 1: Exploded view of the drum brake components



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Fig. Fig. 2: Use a commercially available spray cleaner to remove brake dust from the components



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Fig. Fig. 3: Remove the return spring from the secondary shoe



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Fig. Fig. 4: Pivot and remove the return spring from the primary shoe



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Fig. Fig. 5: Remove the adjusting screw spring



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Fig. Fig. 6: Removing the hold-down pin and spring is easiest using a brake tool



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Fig. Fig. 7: If no brake tool is available, the hold-down assembly may be removed using pliers



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Fig. Fig. 8: One the spring and cap are pivoted, the hold-down pin may be withdrawn from behind the backing plate



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Fig. Fig. 9: Pull outward on the secondary shoe and remove the adjuster screw



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Fig. Fig. 10: Disengage the actuating link



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Fig. Fig. 11: Remove the adjuster lever and lever return spring



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Fig. Fig. 12: Remove the parking brake strut



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Fig. Fig. 13: An assistant is helpful in removing the parking brake cable end from the secondary shoe



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Fig. Fig. 14: If necessary, the shoe guide may be removed from the backing plate



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Fig. Fig. 15: Exploded view of the brake components once they are removed from the backing plate

 
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