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

Adjustment Procedure

    CAUTION:: If the actuator will not hold pressure, do not unthread the parking brake cable from the actuator piston. The cable is under tension and unthreading the cable will cause the cable to spring and can result in personal injury.


    Object Number: 29088 Size: SH
  1. Block the vehicle's wheels.
  2. Turn the ignition ON.
  3. Place the shift lever in N (Neutral).
  4. Loosen the parking brake jam nut on the actuator assembly.
  5. Adjust the cable fitting until tension is obtained.

    6. Tighten
    Tighten the jam nut to 45 N·m (33 lb ft).

    Refer to

    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.

    in General Information.

  6. Place the shift lever in P (Park).
  7. Measure the actuator cable/piston rod stroke.

    8. The distance must be between 30 mm (1.20 in) and 37 mm (1.44 in) while moving the shift lever from P (Park) to N (Neutral).

  8. Remove the wheels blocks.
  9. Check the operating and holding ability of the parking brake.
  10. Repeat the procedure if necessary.