GM Full-Size Trucks 1970-1979 Repair Guide

Cables

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REMOVAL & INSTALLATION



See Figure 1



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Fig. Fig. 1: Common parking brake cable routing

Front Cable
  1. Raise vehicle on hoist.
  2.  
  3. Remove adjusting nut from equalizer.
  4.  
  5. Remove retainer clip from rear portion of front cable at frame and from lever arm.
  6.  
  7. Disconnect front brake cable from parking brake pedal or lever assemblies. Remove front brake cable. On some models, it may assist installation of new cable if a heavy cord is tied to other end of cable in order to guide new cable through proper routing.
  8.  
  9. Install cable by reversing removal procedure.
  10.  
  11. Adjust parking brake.
  12.  

Center Cable
  1. Raise vehicle on hoist.
  2.  
  3. Remove adjusting nut from equalizer.
  4.  
  5. Unhook connector at each end and disengage hooks and guides.
  6.  
  7. Install new cable by reversing removal procedure.
  8.  
  9. Adjust parking brake.
  10.  
  11. Apply parking brake 3 times with heavy pressure and repeat adjustment.
  12.  

Rear Cable
  1. Raise vehicle on hoist.
  2.  
  3. Remove rear wheel and brake drum.
  4.  
  5. Loosen adjusting nut at equalizer.
  6.  
  7. Disengage rear cable at connector.
  8.  
  9. Bend retainer fingers.
  10.  
  11. Disengage cable at brake shoe operating lever.
  12.  
  13. Install new cable by reversing removal procedure.
  14.  
  15. Adjust parking brake.
  16.  

ADJUSTMENT



The rear brakes serve a dual purpose. They are used as service brakes and as parking brakes. To obtain proper adjustment of the parking brake, the service brakes must first be properly adjusted.

  1. Apply the parking brake 1 notch from the fully released position, 4 notches for 1976 and later models.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Loosen the jam nut at the equalizer.
  6.  
  7. Tighten or loosen the adjusting nut until a light drag is felt when the rear wheels are rotated forward.
  8.  
  9. Tighten the check nut.
  10.  
  11. Release the parking brake and rotate the rear wheels. No drag should be felt. If even a light drag is felt, readjust the parking brake.
  12.  
  13. Lower the vehicle.
  14.  

If a new parking brake cable is being installed, pre-stretch it by applying the parking brake hard about three times before making adjustments.

 
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