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    Chrysler Full-Size Trucks 1989-1996 Repair Guide

    Brake Drum

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    CAUTION
    Brake shoes may 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 Figures 1 and 2

    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: Look for the maximum inside diameter specification stamped on the drum



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    Fig. Fig. 2: A common rear drum assembly

    REMOVAL & INSTALLATION



    Chrysler Servo Type with Single Anchor

    See Figures 3, 4, 5, 6, 7 and 8



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    Fig. Fig. 3: Remove the shoe return springs from the Chrysler rear brake assembly

    1. Raise and safely support the truck.
    2.  



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    Fig. Fig. 4: Remove the shoe hold-down springs with a special tool

    1. Remove the plug from the brake adjustment access hole.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 5: Shoe contact points on the backing plate

    1. Insert a thin bladed screwdriver through the adjusting hole and hold the adjusting lever away from the starwheel.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 6: Remove the parking brake strut and spring from the Chrysler rear brake assembly

    1. Release the brake by prying down against the starwheel with a brake spoon.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 7: Exploded view of the brake adjusting screw or "starwheel'' assembly

    1. Remove the rear wheel and clips from the wheel studs. Remove the brake drum.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 8: When the shoe tension is released, remove the drum from the brake assembly

    1. Installation is the reverse of removal. Adjust the brakes.
    2.  

    Bendix Duo-Servo Type

    See Figures 9, 10, 11 and 12

    1. Raise and safely support the vehicle.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 9: Bendix coil spring/hold-down spring combination

    1. Remove the rear wheel and tire.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 10: Use a lever releasing tool to depress the adjuster lever while turning the starwheel with a prytool-Bendix brakes

    1. Remove the axle shaft nuts, washers and cones. If the cones do not readily release, rap the axle shaft sharply in the center.
    2.  



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    Fig. Fig. 11: View of the axle shaft attached to the Bendix backing plate

    1. Remove the axle shaft.
    2.  



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    Fig. Fig. 12: View of the Bendix rear brake assembly

    1. Remove the outer hub nut.
    2.  
    3. Straighten the lockwasher tab and remove it along with the inner nut and bearing.
    4.  
    5. Carefully remove the drum.
    6.  

    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 vehicle.
    12.  

     
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