GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Chevy P12 Chassis 🢒 Brakes 🢒 Park Brake 🢒 Parking Brake Actuator Replacement

Removal Procedure

    CAUTION:: Do not disassemble the actuator. Always service the actuator as a unit. The actuator contains a large spring under tension. Disassembling the actuator allows the spring to expand with great force, which can result in personal injury.

    Notice: When replacing any hydraulic components, the hydraulic system should be flushed with Dexron® III transmission fluid. This is to ensure that the hydraulic system is free of contaminants such as metal particles that may have been circulated through the system as a result of a component failure.

  1. Move the shift lever to the park (P) position and apply the parking brake if the actuator will not hold pressure.
  2. Position a drain pan to catch the fluid that leaks out. Do not reuse the old fluid.

    3. Object Number: 258752 Size: SH
  3. Remove the actuator pipe fitting.
  4. Remove the pipe from the clamps on the side member, if required.

    5. Object Number: 258751 Size: SH
  5. Remove the actuator switch assembly.
  6. Remove the parking brake cable nut and fitting from the actuator rod
  7. Pull the cable away from the bracket.
  8. Remove the actuator from the bracket.
  9. Remove the actuator connector from actuator.
  10. Inspect the actuator bracket for damage, and replace if necessary.

Installation Procedure

    Object Number: 258751 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the actuator bracket (if required) with the bolts.

    2. Tighten
    Tighten the actuator bracket bolts to 90 N·m (66 lb ft).

  2. Install the actuator connector to the actuator.

    3. Tighten
    Tighten the connector to 65 N·m (48 lb ft).

  3. Install the actuator using the mounting nuts and washers.

    4. Tighten
    Tighten the actuator mounting nuts to 108 N·m (80 lb ft).


    Object Number: 258752 Size: SH
  4. Install the hydraulic pipe and the actuator position switch assembly to the actuator.

    5. Tighten
    Tighten the actuator pipe fitting to 16 N·m (12 lb ft).

  5. Secure the pipe with the side member holding screws if the pipe was removed from the holding clamps.

    6. Tighten
    Tighten the clamp screws to 24 N·m (18 lb ft).

  6. Install the parking brake cable. Refer to Park Brake Cable Replacement .
  7. Cycle the system at least six times. Turn the ignition switch ON and move the shift lever from park (P) to neutral (N). Check the fluid level. Refer to Checking and Adding Park Brake Fluid .
  8. Check the hydraulic system for leaks.
  9. Release the manual parking brake. Refer to Park Brake Cable Service/Adjustment .