GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 Engine 🢒 Engine Controls - 1.6L (L91) 🢒 Brake Pressure Modulator Valve Assembly Replacement

Removal Procedure

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


    Object Number: 1290102 Size: SH
  1. Disconnect the negative battery cable.
  2. Drain the engine coolant and remove the engine coolant reservoir tank.
  3. Disconnect the wiring harness connector at the 31-pin antilock brake system (ABS) from the socket on the electronic brake control module (EBCM).
  4. Cover the connector and the socket with shop cloths to protect the components from brake fluid.

    5. Object Number: 1290103 Size: SH
  5. Remove the brake pipes from the hydraulic unit. You may have to loosen the brake pipe nuts on the master cylinder to allow for moving those pipes out of the way.
  6. Loosen the mounting nuts on the hydraulic unit.
  7. Move the brake pipes aside far enough to allow for lifting the ABS 5.3 unit out of the mounting bracket.
  8. Tighten the brake pipe nuts on the master cylinder to avoid leaking brake fluid.
  9. Cap the brake pipes.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1290105 Size: SH
  1. Insert the ABS 5.3 hydraulic unit into the mounting bracket and install the nuts.

    2. Tighten
    Tighten the nuts to 15 N·m (11 lb ft).

  2. Remove the screw plugs and install all of the hydraulic brake pipes.

    3. Tighten
    Tighten the brake pipe nuts to 22 N·m (16 lb ft).

  3. Connect the 31-pin wiring harness connector J1.
  4. Connect the negative battery cable.
  5. Bleed the hydraulic system. Refer to Hydraulic Brake System Bleeding in Hydraulic Brakes.
  6. Install the engine coolant reservoir tank and fill the tank with engine coolant.