GM Chevy Mid-Size Cars 1964-1988 Repair Guide

Brake Drums and 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



For information concerning the wheel bearings, please refer to the wheel bearing procedures in Suspension & Steering of this information. Disassemble the brakes on only one side of the vehicle at a time so that you may use the assembled side for reference during reassembly. Remember that the opposite side is a mirror image of the side on which you are working.

  1. Raise and support the front of the vehicle safely using jackstands.
  2.  
  3. Remove the front wheel and drum as a unit by removing the spindle nut and cotter pin.
  4.  
  5. Free the brake shoe return springs, actuator pull-back spring, hold-down pins and springs, and the actuator assembly.
  6.  

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

  1. Disconnect the adjusting mechanism and spring, then 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. Remove the secondary shoe.
  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.  

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. Inspect the replacement shoes for nicks or burrs, lubricate the backing plate contact points, brake cable and levers, and adjusting screws and then install the components using the assembled side for reference.
  2.  
  3. Position the secondary shoe. The hold-down spring and pin may be used to retain the shoe in position during the procedure.
  4.  
  5. Position the primary shoe, then connect the adjusting mechanism and spring.
  6.  

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. Install the brake shoe return springs, actuator pull-back spring, hold-down pins and springs (if not done earlier), and the actuator assembly.
  2.  
  3. Install the front wheel and drum as a unit, then install the spindle nut and cotter pin. Properly adjust the wheel bearings. For details, refer to Suspension & Steering of this guide.
  4.  
  5. Properly adjust the drum brakes. Refer to the procedure earlier in this section.
  6.  
  7. Remove the jackstands and carefully lower the vehicle.
  8.  

DRUM INSPECTION



  1. Check the drums for any cracks, scores, grooves, or an out-of-round condition. Replace if cracked. Slight scores can be removed with fine emery cloth while extensive scoring requires turning the drum on a lathe.
  2.  
  3. Never have a drum turned more than 0.060 in. (1.524mm).
  4.  

 
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