Park Brake Cable Service/Adjustment Mechanical Park Brake

The parking brake must be adjusted any time the cables have been disconnected or the brake holding ability is not adequate. Before adjusting the parking brake, check the condition of the service brakes. The service brakes must be adjusted properly before adjusting the parking brake.

1. Block the front wheels.
2. Raise the rear axle and support the axle with safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
3. Loosen the equalizer nut.
4. Set the parking brake pedal to four clicks.
5. Adjust the equalizer nut until the wheels are rotated forward with a moderate drag.
6. Release the parking brake and rotate the rear wheels. There should be no brake drag.
7. Lower the vehicle.
8. Unblock the front wheels.

1. Block the front wheels.
2. Raise the rear axle and support the axle with safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
3. Loosen the equalizer nut.
4. Adjust the equalizer nut until a light drag is felt while rotating the wheels forward.
5. Adjust the knob on the lever until a definite snap over the center is felt.
6. Release the parking brake and rotate the rear wheels. There should be no brake drag.
7. Lower the vehicle.
8. Unblock the front wheels.

Park Brake Cable Service/Adjustment Electric Auto Park Brake

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.

1. Before beginning this adjustment, the parking brake lining wear adjustment must be made. Refer to Parking Brake Shoe Inspection .
2. Block the vehicle wheels.
3. Turn the ignition key ON.
4. Place the shift lever in the NEUTRAL position.
5. Loosen the parking brake jam nut on the actuator assembly.

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.

6. Adjust the cable fitting.

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

7. Place the shift lever into the PARK position and apply the parking brake.
8. Measure the actuator cable/piston rod stroke. If the distance is not between 30-37 mm (1.20-1.44 in) while moving the shift lever from park to neutral, then refer to Park Brake Cable Service/Adjustment .
9. Remove the wheel blocks.
10. Check the parking brake operating and holding ability.
11. Repeat the procedure if necessary.

Park Brake Cable Service/Adjustment Propeller Shaft Park Brake

1. Raise the vehicle and support the vehicle with safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
2. Install the drum over the first rivet section. Leave the adjuster screw accessible.
3. Place 0.254 mm (0.010 in) shims between both the shoes and the drum. The shims should be 140-180 degrees apart.
4. Rotate the adjuster screw until the shims indicate the spacing has been met (no clearance).
5. Remove the shims and complete the drum installation. The drum should spin free with only a light drag.

1. Raise the vehicle and support the vehicle with safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
2. Adjust the screw through the drum opening until the brake just locks up.
3. Back off the adjuster 2-4 notches. The drum should spin with only a light drag.
4. Lower the vehicle.