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Home >> Chevrolet >> 2007 >> Optra LS, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Antilock Brake System >> Repair Instructions >> Brake Modulator Assembly Replacement >> Removal Procedure
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Removal Procedure

    Fig 1: View Of ABS Wiring Harness On EBCM
    GM1290102Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Battery Disconnect Caution .
  1. Disconnect the negative battery cable.
  2. Disconnect the 31-pin antilock brake system (ABS) wiring harness connector from its socket on the electronic brake control module (EBCM).
  3. Cover the connector and the socket with shop cloths to protect the components from brake fluid.
    4. Fig 2: View Of Brake Pipe Mounting Nuts
    GM1290103Courtesy of GENERAL MOTORS CORP.
    NOTE: Take care not to allow air into the brake pressure modulator valve or into the brake pipes from the master cylinder. If air gets into the brake pressure modulator valve, it will require a bleeding procedure using a scan tool programmed for the ABS 5.3 system. As long as no air enters the brake pressure modulator valve, a simple bleeding procedure is all the system will require.
  4. Remove the brake pipes from the brake pressure modulator valve. You may have to loosen the brake pipe nuts on the master cylinder to allow for moving those pipes out of the way.
  5. Loosen the mounting nuts on the brake pressure modulator valve.
  6. Move the brake pipes aside far enough to allow for lifting the ABS unit out of the mounting bracket.
  7. Tighten the brake pipe nuts on the master cylinder to avoid leaking brake fluid.
  8. Cap the brake pipes.
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