Chrysler Full-Size Trucks 1967-1988 Repair Guide

Brake Drum

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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.

INSPECTION



See Figure 1

Check that there are no cracks or chips in the braking surface. Excessive bluing indicates overheating and a replacement drum is needed. The drum can be machined to remove minor damage and to establish a rounded braking surface on a warped drum. Never exceed the maximum oversize of the drum when machining the braking surface. The maximum inside diameter is stamped on the rim of the drum.



Click image to see an enlarged view

Fig. Fig. 1: Diameter is usually stamped on the outer edge of the drum

REMOVAL & INSTALLATION



Servo With Single Anchor
  1. Jack and support the truck.
  2.  
  3. Remove the plug from the brake adjustment access hole.
  4.  
  5. Insert a thin bladed prytool through the adjusting hole and hold the adjusting lever away from the star wheel.
  6.  
  7. Release the brake by prying down against the star wheel with a brake spoon.
  8.  
  9. Remove the rear wheel and clips from the wheel studs. Remove the brake drum.
  10.  
  11. If there is a little trouble releasing the drum from the axle, you may tap around on the drum in an even manner to loosen it.
  12.  

To install:
  1. Install the drum and retaining clips.
  2.  
  3. Install the wheel and tire assembly.
  4.  
  5. Adjust the brakes.
  6.  

Bendix Duo-Servo
  1. Raise and support the vehicle.
  2.  
  3. Remove the rear wheel and tire.
  4.  
  5. Remove the axle shaft nuts, washers and cones. If the cones do not readily release, tap the axle shaft sharply in the center.
  6.  
  7. Remove the axle shaft.
  8.  
  9. Remove the outer hub nut.
  10.  
  11. Straighten the lockwasher tab and remove it along with the inner nut and bearing.
  12.  
  13. Carefully remove the drum.
  14.  

To install:
  1. Position the drum on the axle housing.
  2.  
  3. Install the bearing and inner nut. While rotating the wheel and tire, tighten the adjusting nut until a slight drag is felt.
  4.  
  5. Back off the adjusting nut 1 / 6 turn so that the wheel rotates freely without excessive end-play.
  6.  
  7. Install the lockrings and nut. Place a new gasket on the hub and install the axle shaft, cones, lockwashers and nuts.
  8.  
  9. Install the wheel and tire.
  10.  
  11. Road test the truck.
  12.  

 
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