Aspen 2007, Durango 2005-2007

Brake Shoes

Print

Adjustment



The rear drum brakes are equipped with a self-adjusting mechanism. Under normal circumstances, the only time adjustment is required is when the shoes are replaced, removed for access to other parts, or when one or both drums are replaced.

Adjustment can be made with a standard brake gauge or with adjusting tool. Adjustment is performed with the complete brake assembly installed on the backing plate.

With A Brake Gauge
  1. Be sure parking brakes are fully released.
  2.  
  3. Raise rear of vehicle and remove wheels and brake drums.
  4.  
  5. Verify that left and right automatic adjuster levers and cables are properly connected.
  6.  
  7. Insert brake gauge in drum. Expand gauge until gauge inner legs contact drum braking surface. Then lock gauge in position.

    Click image to see an enlarged view

    Fig. Brake gauge on drum

  8.  
  9. Reverse gauge and install it on brake shoes. Position gauge legs at shoe centers as shown. If gauge does not fit (too loose/too tight), adjust shoes.

    Click image to see an enlarged view

    Fig. Brake gauge on shoes

  10.  
  11. Pull shoe adjuster lever away from adjuster screw star wheel.
  12.  
  13. Turn adjuster screw star wheel (by hand) to expand or retract brake shoes. Continue adjustment until gauge outside legs are light drag-fit on shoes.
  14.  
  15. Install brake drums and wheels and lower vehicle.
  16.  
  17. Drive vehicle and make one forward stop followed by one reverse stop. Repeat procedure 8-10 times to operate automatic adjusters and equalize adjustment.
    NOTE
    Bring vehicle to complete standstill at each stop. Incomplete, rolling stops will not activate automatic adjusters.

  18.  

With An Adjusting Tool
  1. Be sure parking brake lever is fully released.
  2.  
  3. Raise vehicle so rear wheels can be rotated freely.
  4.  
  5. Remove plug from each access hole in brake support plates.
  6.  
  7. Loosen parking brake cable adjustment nut until there is slack in front cable.
  8.  
  9. Insert adjusting tool through support plate access hole and engage tool in teeth of adjusting screw star wheel.

    Click image to see an enlarged view

    Fig. Brake adjustment using tool. A thin screwdriver can be used to move adjusting lever away from star wheel.

  10.  
  11. Rotate adjuster screw star wheel (move tool handle upward) until slight drag can be felt when wheel is rotated.
  12.  
  13. Push and hold adjuster lever away from star wheel with thin screwdriver.
  14.  
  15. Back off adjuster screw star wheel until brake drag is eliminated.
  16.  
  17. Repeat adjustment at opposite wheel. Be sure adjustment is equal at both wheels.
  18.  
  19. Install access hole plugs.
  20.  
  21. Adjust parking brake cable and lower vehicle.
  22.  
  23. Drive vehicle and make one forward stop followed by one reverse stop. Repeat procedure 8-10 times to operate automatic adjusters and equalize adjustment.
    NOTE
    Bring vehicle to complete standstill at each stop. Incomplete, rolling stops will not activate automatic adjusters.

  24.  

Removal & Installation



Bendix® Duo-Servo


Click image to see an enlarged view

Fig. Exploded view of the rear brake components

  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2.  
  3. Unhook and remove the adjusting lever return spring.
  4.  
  5. Remove the lever from the lever pivot pin.
  6.  
  7. Unhook the adjuster lever from the adjuster cable.
  8.  
  9. Unhook the upper shoe-to-shoe spring.
  10.  
  11. Unhook and remove the shoe hold-down springs.
  12.  
  13. Disconnect the parking brake cable from the parking brake lever.
  14.  
  15. Remove the shoes with the lower shoe-to-shoe spring and star wheel as an assembly.
  16.  

To install:

  1. The pivot screw and adjusting nut on the left side have left-hand threads and right-hand threads on the right side.
  2.  
  3. Lubricate and assemble the star wheel assembly. Lubricate the guide pads on the support plates.
  4.  
  5. Assemble the star wheel, lower shoe-to-shoe spring, and the primary and secondary shoes. Position this assembly on the support plate.
  6.  
  7. Install and hook the hold-down springs.
  8.  
  9. Install the upper shoe-to-shoe spring.
  10.  
  11. Install the cable and retaining clip.
  12.  
  13. Position the adjuster lever return spring on the pivot (green springs on left brakes and red springs on right brakes).
  14.  
  15. Install the adjuster lever. Route the adjuster cable and connect it to the adjuster.
  16.  
  17. Install the brake drum and adjust the brakes.
  18.  

Servo Type With Single Anchor
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the rear wheel, drum retaining clips and the brake drum.
  6.  
  7. Remove the brake shoe return springs, noting how the secondary spring overlaps the primary spring.
  8.  
  9. Remove the brake shoe retainer, springs and nails.
  10.  
  11. Disconnect the automatic adjuster cable from the anchor and unhook it from the lever. Remove the cable, cable guide, and anchor plate.
  12.  
  13. Remove the spring and lever from the shoe web.
  14.  
  15. Spread the anchor ends of the primary and secondary shoes and remove the parking brake spring and strut.
  16.  
  17. Disconnect the parking brake cable and remove the brake assembly.
  18.  
  19. Remove the primary and secondary brake shoe assemblies and the star adjuster as an assembly. Block the wheel cylinders to retain the pistons.
  20.  

To install:

  1. Measure the drum as described in this section.
  2.  
  3. Apply a thin coat of lubricant to the support platforms.
  4.  
  5. Attach the parking brake lever to the rear of the secondary shoe.
  6.  
  7. Place the primary and secondary shoes in their relative positions on a workbench.
  8.  
  9. Lubricate the adjuster screw threads. Install it between the primary and secondary shoes with the star wheel next to the secondary shoe. The star wheels are stamped with an L (left) and R (right).
  10.  
  11. Overlap the ends of the primary and second brake shoes and install the adjusting spring and lever at the anchor end.
  12.  
  13. Hold the shoes in position and install the parking brake cable into the lever.
  14.  
  15. Install the parking brake strut and spring between the parking brake lever and primary shoe.
  16.  
  17. Place the brake shoes on the support and install the retainer nails and springs.
  18.  
  19. Install the anchor pin plate.
  20.  
  21. Install the eye of the adjusting cable over the anchor pin and install the return spring between the anchor pin and primary shoe.
  22.  
  23. Install the cable guide in the secondary shoe and install the secondary return spring. Be sure that the primary spring overlaps the secondary spring.
  24.  
  25. Position the adjusting cable in the groove of the cable guide and engage the hook of the cable in the adjusting lever.
  26.  
  27. Install the brake drum and retaining clips. Install the wheel and tire.
  28.  
  29. Adjust the brakes and road-test the truck.
  30.  

 
label.common.footer.alt.autozoneLogo