Roadmaster 1992

Brake Shoes

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Adjustment



  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    Disconnecting the negative battery cable on some vehicles may interfere with the functions of the on-board computer systems and may require the computer to undergo a relearning process, once the negative battery cable is reconnected.


    NOTE
    If working near and/or around the SRS system and components, be sure to properly disable the SRS system. See disarming/arming the SRS system.


    NOTE
    For vehicles equipped with OnStar (RPO UE1), with battery backup, the backup battery is a redundant power supply to allow limited ONStar functionality in the event of a main battery power disruption to the OnStar module (VCIM). Do not disconnect the main vehicle battery or remove the OnStar fuse with the ignition key in any position other than OFF. Retained accessory power should be allowed to time out or be disabled by opening the driver-s side door before disconnecting power. Disconnecting power to the module in any way while the ignition is ON or with the retained accessory power activated may cause activation of the OnStar backup battery system and will discharge and permanently damage the backup battery. Once the backup battery is activated it will stay on until it has completely discharged. The backup battery is not rechargeable and once it is activated, it must be replaced.

  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Remove the tire and wheel assembly.
  8.  
  9. Remove the brake drum.
  10.  
  11. Measure the inside diameter of the brake drum using tool J21177-A or equivalent.
  12.  
  13. Turning the star wheel, adjust the shoe and lining diameter to 0.050 inch less than the inside drum diameter for each wheel.

    Click image to see an enlarged view

    Fig. Rear brake shoe adjuster and related components



    Click image to see an enlarged view

    Fig. Rear brake shoe adjustment measurements location points (1 of 2)



    Click image to see an enlarged view

    Fig. Rear brake shoe adjustment measurements location points (2 of 2)

  14.  
  15. Using the GM diagnostic scan tool or aftermarket equivalent reprogram the necessary systems and components. Be sure to follow the scan tool manufacturer-s directions.
  16.  

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    Disconnecting the negative battery cable on some vehicles may interfere with the functions of the on-board computer systems and may require the computer to undergo a relearning process, once the negative battery cable is reconnected.

  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove 2/3 brake fluid from the master cylinder.
  6.  
  7. Raise and safely support the vehicle.
  8.  
  9. Remove the tire and wheel assembly.
  10.  
  11. Remove the brake drum.
  12.  
  13. Remove the return springs using tool J8049, or equivalent.
  14.  
  15. Remove the holddown springs and pins.
  16.  
  17. Remove the lever pivot.
  18.  
  19. Remove the actuator link while lifting up on the actuator lever.
  20.  
  21. Remove the actuator lever, pawl and lever return spring.
  22.  
  23. Remove the shoe guide, parking brake strut and strut spring.
  24.  
  25. Remove the shoe and lining assemblies after disconnecting the parking brake cable.
  26.  
  27. Remove the adjusting screw assembly and spring.
  28.  
  29. Remove the parking brake lever by unlocking the lever tab from the shoe.
    NOTE
    If any parts are of doubtful strength, they should be replaced.



    Click image to see an enlarged view

    Fig. Rear brake shoes and related components-1991-1993



    Click image to see an enlarged view

    Fig. Rear brake shoes and related components-1994-1996

  30.  

To install:


NOTE
Be sure to use new fasteners, as required.


NOTE
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread sealer are identified. Do not use paints, lubricants or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners.

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

    Click image to see an enlarged view

    Fig. Rear brake shoe adjuster and related components

  4.  
  5. Using the GM diagnostic scan tool or aftermarket equivalent reprogram the necessary systems and components. Be sure to follow the scan tool manufacturer-s directions.
  6.  

 
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