GM Firebird 1967-1981 Repair Guide

Brake Shoes

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ADJUSTMENT



Rotate the star wheel adjuster until a slight drag is felt between the shoes and drum, then back off 1 1 / 4 turns on the adjusting wheel. Put the car in reverse and, while backing up, firmly apply the brakes. This will allow the self-adjusters to complete the adjustment.

REMOVAL & INSTALLATION



See Figures 1 through 14

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Fig. Fig. 1: Exploded view of the rear drum brake assembly, and identification of the individual components used in this assembly



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Fig. Fig. 2: Clean the brake parts only with a solvent specifically designed for that purpose



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Fig. Fig. 3: A special brake tool can be helpful for removing the upper return springs from the stud



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Fig. Fig. 4: Remove the front return spring ...



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Fig. Fig. 5: ... then remove the rear spring



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Fig. Fig. 6: Remove the adjuster lever spring ...



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Fig. Fig. 7: ... then pivot the adjuster lever up and remove the actuating link



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Fig. Fig. 8: Remove both brake shoe hold-down springs ...



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Fig. Fig. 9: ... then pull the adjuster lever (A) and spring (B) off the rear brake shoe



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Fig. Fig. 10: Remove the front shoe from the adjusting screw and spring



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Fig. Fig. 11: Remove the adjusting screw ...



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Fig. Fig. 12: ... and spring from the rear brake shoe



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Fig. Fig. 13: Pull the rear shoe down and out to remove the parking brake strut ...



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Fig. Fig. 14: ... and detach the rear shoe from the parking brake lever

  1. Raise the car and support it on jackstands.
  2.  
  3. Slacken the parking brake cable.
  4.  
  5. Remove the rear wheel and brake drum. The front wheel and drum may be removed as a unit by removing the spindle nut and cotter pin.
  6.  
  7. Free the brake shoe return springs, actuator pull-back spring, hold-down pins and springs, and actuator assembly.
  8.  

Special tools available from auto supply stores will ease removal of the spring and anchor pin, but the job may still be done with common hand tools.

  1. On the rear wheels, disconnect the adjusting mechanism and spring, and remove the primary shoe. The primary shoe has a shorter lining than the secondary and is mounted at the front of the wheel.
  2.  
  3. Disconnect the parking brake lever from the secondary shoe and remove the shoe. Front wheel shoes may be removed together.
  4.  
  5. Clean and inspect all brake parts.
  6.  
  7. Check the wheel cylinders for seal condition and leaking.
  8.  
  9. Repack the wheel bearings and replace the seals.
  10.  
  11. Inspect the replacement shoes for nicks or burrs, lubricate the backing plate contact points, brake cable and levers, and adjusting screws, then assemble.
  12.  
  13. 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.
  14.  
  15. To install, reverse the removal procedure. When completed, adjust the brake shoes, as described earlier in this section.
  16.  

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.

 
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