GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Brake Shoes

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INSPECTION



To inspect the brake shoes, first remove the drum as described above. Then, measure the thickness of the lining. To do this, you can lay a ruler next to the shoe, perpendicular to the surface, and measure the thickness of the lining alone. If the thickness does not meet or exceed the dimension shown in the specifications chart or state inspection standards in your state whichever is thicker , replace the lining. Remember, also, that there must be enough lining left so that the minimum thickness will still exist when you plan to perform your next inspection.

REMOVAL & INSTALLATION

See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15


CAUTION
Some 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.

  1. Raise the vehicle and support it on jackstands.
  2.  
  3. Slacken the parking brake cable.
  4.  
  5. Remove the rear wheel and brake drum.
  6.  
  7. Free the brake shoe return springs, actuator pull-back spring, holddown 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. Rear wheel shoes may be removed together.
  4.  

To install:
  1. Clean and inspect all brake parts.
  2.  
  3. Check the wheel cylinders for seal condition and leaking.
  4.  
  5. Repack wheel bearings and replace the seals.
  6.  
  7. Inspect the replacement shoes for nicks or burrs, lubricate the backing plate contact points, brake cable and levers, and adjusting screws and then assemble.
  8.  
  9. 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.
  10.  
  11. When completed, make an initial adjustment as previously described.
  12.  

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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Fig. Fig. 1: Using specialized brake tools can save time and make the job easier



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Fig. Fig. 2: Removing the brake drum



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Fig. Fig. 3: This tool simplifies return spring removal



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Fig. Fig. 4: Note the return spring position before removing it from the brake assembly



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Fig. Fig. 5: Removing the actuating link



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Fig. Fig. 6: After the return springs have been removed, the shoe guide can be removed from the anchor pin



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Fig. Fig. 7: Push and twist the hold down spring to disengage it from the hold down pin



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Fig. Fig. 8: Removing the hold down spring and pin



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Fig. Fig. 9: The rear wheel shoes can be removed together



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Fig. Fig. 10: A view of rear drum brake components



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Fig. Fig. 11: Measuring brake drum diameter for shoe adjustment



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Fig. Fig. 12: Adjusting rear drum brakes using a brake adjusting spoon



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Fig. Fig. 13: Wheel cylinder secured by a retainer



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Fig. Fig. 14: Wheel cylinder secured by bolts



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Fig. Fig. 15: Exploded view of a rear drum brake assembly

 
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