GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1997 🢒 GMC P62 Commercial Chassis 🢒 Brakes 🢒 Park Brake 🢒 Hydraulic Auto Apply Pump Assembly

Removal Procedure

    Object Number: 29075 Size: SH
  1. Move the column shift lever to the P (Park) position.

    2. Important: Do not reuse the old fluid.

  2. Position a drain pan to catch the fluid that leaks out.
  3. Remove the access panel.
  4. Disconnect the parking brake pump assembly electrical connector.

    5. Object Number: 29076 Size: SH
  5. Disconnect the pressure switch electrical connector.
  6. Disconnect the hydraulic pipes.

    7. Object Number: 29077 Size: SH
  7. Remove the parking brake pump mounting bolts.
  8. Remove the parking brake pump assembly.

    9. Object Number: 29092 Size: SH
  9. Remove the pressure maintenance switch from the parking brake pump assembly.

Installation Procedure

    Important: When replacing any hydraulic components, the hydraulic system should be flushed with Dexron® IIE 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.


    Object Number: 29092 Size: SH
  1. Install the pressure switch to the parking brake pump assembly.

    2. Tighten
    Tighten the pressure switch to 12 N·m (106 lb in).

    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.


    Object Number: 29077 Size: SH
  2. Install the parking brake pump assembly.
  3. Install the parking brake pump assembly mounting bolts.

    4. Tighten
    Tighten the parking brake pump assembly mounting bolts to 37 N·m (27 lb ft).


    Object Number: 29078 Size: SH
  4. Connect the hydraulic pipes.

    5. Tighten
    Tighten the hydraulic pipe fittings to 16 N·m (12 lb ft).

  5. Connect the pressure switch electrical connector.
  6. Connect the parking brake pump assembly electrical connector.
  7. Install the access panel.

    8. Tighten
    Tighten the access panel fasteners to 13 N·m (10 lb ft).

  8. Fill the reservoir with Dexron® IIE transmission fluid.
  9. Cycle the system at least six times.
    10. 9.1. With the ignition switch ON, move the shift lever from P (Park) to N (Neutral).
    9.2. Check the fluid level. Refer to Checking and Adding Fluid .