Roadmaster 1992

Wheel Speed Sensors

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Removal & Installation



Front Wheel
  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. Disconnect the body harness connector from the sensor.
  6.  
  7. Disconnect the sensor from the brake line connector.
  8.  
  9. Raise and safely support the vehicle.
  10.  
  11. Remove the bolt/screw and bracket from the frame.
  12.  
  13. Remove the sensor harness grommets from the brackets.
  14.  
  15. Remove the bolts/screws securing the brackets to the frame and splash shield, if necessary.
  16.  
  17. Remove the brackets, if necessary.
  18.  
  19. Remove the sensor mounting bolt.
  20.  
  21. Remove the sensor from the steering knuckle.

    Click image to see an enlarged view

    Fig. ABS front sensor and related components (left side)-1991-1993



    Click image to see an enlarged view

    Fig. ABS front sensor and related components (right side)-1991-1993



    Click image to see an enlarged view

    Fig. ABS front sensor and related components-1994-1996

  22.  

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.
    NOTE
    On 1994-1996 vehicles, each replacement wheel speed sensor is identified with a white tag, located near the neck of the sensor and labeled FL (front left) and FR (front right).

  2.  
  3. Tighten the retaining bolt to 71 inch lbs.
    NOTE
    Proper installation of the sensor cables is critical for system operation. Be sure that the cables are installed in retainers. Failure to install the cables in the retainers may result in contact with moving parts and/or over extension of cables, resulting in an open circuit.


    NOTE
    If the sensor is removed or replaced the sensor body must be coated with GM anti-corrosion compound (part number 12345489, or equivalent where the sensor comes in contact with the steering knuckle.

  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.  

Rear Wheel
  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. Raise and safely support the vehicle.
  6.  
  7. Disconnect the sensor connector.
  8.  
  9. Remove the sensor mounting bolt.
  10.  
  11. Remove the sensor.

    Click image to see an enlarged view

    Fig. ABS rear sensor and related components-1991-1993



    Click image to see an enlarged view

    Fig. ABS rear sensor and related components-1994-1996

  12.  

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.
    NOTE
    Proper installation of the sensor cables is critical for system operation. Be sure that the cables are installed in retainers. Failure to install the cables in the retainers may result in contact with moving parts and/or over extension of cables, resulting in an open circuit.


    NOTE
    Each replacement wheel speed sensor is identified with a white tag, located near the neck of the sensor and labeled LR (left rear) and RR (right rear).


    NOTE
    If the sensor is removed or replaced the sensor body must be coated with GM anti-corrosion compound (part number 12345489, or equivalent where the sensor comes in contact with its mounting.

  2.  
  3. Tighten the sensor retaining bolt to 71 inch lbs.
  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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