Parking Brake System: Adjustments
PRELIMINARY INFORMATIONThe parking brake pedal must be free from corrosion and lubricated for correct operation. The parking brake pedal must return to the released position without sticking or binding. If a problem is present check the cable routing for binding or misadjusted parking brake cables. The parking brake cable tension is self adjusting. However, during normal brake lining wear, it is possible that the parking brake cable tension may need adjustment do to the increased lever travel. If adjustment is required, first check the following:
^ Rear brake shoe wear.
NOTE: Rear brake shoe thickness should not be more than (Approximately) 80 percent worn. If worn beyond this limit, replace the brake shoes. Service and Repair
^ The parking brake system is free from corrosion and free from sticking or binding.
1. Block the front wheels.
2. Raise and support the rear axle with safety stands.
3. Set parking brake pedal to the full up position, then measure the threads on the equalizer. Adjust to the following specifications:
^ Passenger/Cargo to 13 mm (0.511 inch).
^ Cutaway/Upfitters to 27 mm (1.062 inch).
4. Verify that the vehicle will hold position with the parking brake pedal depressed.
5. If additional adjustments need to be made, rotate the adjuster nut in 5 mm (0.196 inch) increments until the rear wheels obtain a moderate drag.
CAUTION: To prevent damage to the threaded parking brake adjusting rod when servicing the parking brake, the following is recommended:
^ Before attempting to turn the adjusting nut, clean the exposed threads on each side of the nut.
^ Lubricate the threads of the adjusting rod before turning the nut.
6. Back off the adjuster nut until the rear wheels are free from drag.
7. Verify that the vehicle will hold position with the parking brake pedal depressed.
8. Lower the vehicle.
9. Unblock the front wheels.