Roadmaster 1992

Hydraulic Control Module

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Removal & Installation




NOTE
GM refers to this component as an Electronic Brake Pressure Modulator Valve (EBPMV). This component is not serviceable and is to be replaced as complete assembly. No screws on the component may be loosened.

  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. Remove the air intake duct and resonator assembly.
  6.  
  7. On 1991-1993 vehicles, move the upper radiator hose out of the way. Move the canister purge hose assembly at the canister.
  8.  
  9. Disconnect the electrical connectors.
  10.  
  11. Disconnect the ground cable connector at the motor.
  12.  
  13. Matchmark the brake lines to their respective ports to aid in reassembly. Disconnect and plug the brake lines.
    NOTE
    Reposition the brake lines only enough to remove the component. Do not kink or bend the lines.

  14.  
  15. Remove the component from the vehicle.

    Click image to see an enlarged view

    Fig. ABS hydraulic control module (EBCM) and related components-1991-1993



    Click image to see an enlarged view

    Fig. ABS hydraulic control module (EBCMBPMV) and related components-1994-1996

  16.  

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
    Be sure the brake lines are correctly connected. If the lines are not correctly connected, as removed wheel lock up could occur and personal injury may result.



    Click image to see an enlarged view

    Fig. ABS hydraulic control module (EBCMBPMV) brake line routing-1994-1996

  2.  
  3. Fill the brake system with the proper grade and type brake fluid.
  4.  
  5. Bleed the brake system.
  6.  
  7. 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.
  8.  

 
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