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Home >> GMC >> 2001 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Repair Instructions >> Brake Pressure Modulator Valve Replacement >> Removal Procedure

Removal Procedure

    CAUTION:

    Refer to BATTERY DISCONNECT CAUTION in Cautions and Notices.

  1. Remove the negative battery cable.
    2. Fig 1: View Of EBCM/EHCU Assembly
    GM379478Courtesy of GENERAL MOTORS COMPANY
    IMPORTANT:

    The area around the electric hydraulic control unit (EHCU) MUST be free from loose dirt to prevent contamination of disassembled ABS components.

  2. Thoroughly wash all contaminants from around the EHCU.
  3. Disconnect the 3 electrical harness connectors from the electronic brake control module (EBCM).
    4. IMPORTANT:

    Make sure that brake lines are tagged and kept in order for proper reassembly.

  4. Disconnect the 5 brake lines from the brake pressure modulator valve (BPMV). When looking at the brake pipe port face of the BPMV, the ports are assigned as follows:
    • Upper Left-Left Front Output
    • Upper Middle-Right Front Output
    • Upper Right-Rear Output
    • Lower Left-Master Cylinder Secondary/Front Input
    • Lower Right-Master Cylinder Primary/Front Input
  5. Remove the bolts (4) securing the EHCU mounting bracket (3) to the frame rail (5).
  6. Remove the EHCU (1) from the vehicle.
    7. Fig 2: Exploded View Of EBCM & BPMV Components (w/o JL4)
    GM379484Courtesy of GENERAL MOTORS COMPANY
  7. Remove the bolts (4) securing the BPMV mounting bracket (3) to the BPMV (1).
  8. Disconnect the 2 way ABS pump motor connector.
  9. Remove the T-25 TORX® bolts from the EBCM (2).
    10. IMPORTANT:
    • Do not use a tool to pry the EBCM or the BPMV. Excessive force will damage the EBCM.
    • Do not reuse the EBCM mounting bolts. Always install new bolts.
  10. Remove the EBCM (2) from the BPMV (1). Removal may require a light amount of force.
  11. Clean the EBCM to BPMV mounting surfaces with a clean cloth.
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