GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2005 🢒 Wave 🢒 Body 🢒 Data Link Communications 🢒 Brake Pressure Modulator Valve Assembly Replacement

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.


    Object Number: 1523854 Size: SH

    Caution: For safety reasons, the Brake Pressure Modulator Valve (BPMV) must not be repaired; the complete unit must be replaced. With the exception of the EBCM/EBTCM, no screws may be loosened. If screws are loosened, it will not be possible to get the brake circuits leak-tight and personal injury may result.

    Caution: Brake fluid may irritate eyes and skin. In case of contact, take the following actions:

       • Eye contact - rinse thoroughly with water.
       • Skin contact - rinse with soap and water.
       • If ingested - consult a physician immediately.

    Notice: Avoid spilling brake fluid on any of the vehicle's painted surfaces, wiring, cables or electrical connectors. Brake fluid will damage paint and electrical connections. If any fluid is spilled on the vehicle, immediately flush the area with water to minimize the potential for damage.

    Notice: To prevent equipment damage, never connect or disconnect the wiring harness connection from the EBCM with the ignition switch in the ON position.

  1. Disconnect the negative battery cable.
  2. Remove the cooling surge tank. Refer to Radiator Surge Tank Replacement .
  3. Disconnect the ABS wiring harness connector from its socket on the electronic brake control module (EBCM).
  4. Cover the connector and the socket with shop cloths to protect them from brake fluid.

    5. Object Number: 1523852 Size: SH

    Important: Do not allow air into the hydraulic unit or into the brake pipes from the master cylinder. If air gets into the hydraulic unit, it will require a bleeding procedure using a scan tool programmed for the brake modulator system. As long as no air enters the hydraulic unit, a simple bleeding procedure is all the system will require.

  5. Remove the brake pipes fitting nuts from the hydraulic unit.
  6. Remove the mounting bracket bolts on the hydraulic unit.
  7. Remove the brake modulator assembly.

Installation Procedure

    Object Number: 1523852 Size: SH
  1. Install the brake modulator assembly.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Install the mounting bracket bolts on the hydraulic unit.

    3. Tighten
    Tighten the torque ABS mounting bracket bolts to 22 N·m (16 lb ft).


    Object Number: 1523854 Size: SH
  3. Install the brake pipes fitting nuts from the hydraulic unit.

    4. Tighten
    Tighten the torque brake pipe fitting nuts to 16 N·m (12 lb ft).

  4. Connect the ABS wiring harness connector to its socket on the EBCM.
  5. Connect the negative battery cable.

    6. Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.

  6. Add new brake fluid and bleed the brake system. Refer to Hydraulic Brake System Bleeding .
  7. Inspect the brake system for leaks.