GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Master Cylinder Replacement

Removal Procedure

    Object Number: 1289919 Size: SH
  1. Disconnect the electrical connector from the reservoir.

    2. Object Number: 1289922 Size: SH
  2. For vehicles with the antilock brake system (ABS) braking system, disconnect the brake lines from the master cylinder body.
  3. For vehicles with the non-ABS braking system, disconnect the brake lines from the proportioning valves.
  4. For vehicles with the manual transaxle, disconnect the clip to the clutch hose connection to the master cylinder and move the clip out of the way.
  5. Remove the clutch hose from the master cylinder, if equipped.
  6. Plug the opening to the brake lines to prevent fluid loss and contamination.

    7. Object Number: 1289933 Size: SH
  7. Remove the attaching nuts from the power booster.
  8. Remove the master cylinder assembly.
  9. Drain the brake fluid.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1289933 Size: SH
  1. Install the master cylinder assembly with the new attaching nuts.

    2. Tighten
    Tighten the master cylinder attaching nuts to 18 N·m (13 lb ft).


    Object Number: 1289922 Size: SH
  2. For vehicles with the ABS braking system, as shown, connect the brake lines to the cylinder body.
  3. For vehicles with the non-ABS braking system, connect the brake lines to the proportioning valves.

    4. Tighten
    Tighten the brake lines to 16 N·m (12 lb ft).

  4. For vehicles with the manual transaxle, connect the clip to the clutch hose connection to the master cylinder reservoir, if equipped.

    5. Object Number: 1289919 Size: SH
  5. Connect the electrical connector.
  6. Add brake fluid.
  7. Inspect for leaks and recheck the fluid level.
  8. Bleed the brake system. Refer to Hydraulic Brake System Bleeding .