Parking Brake System: Adjustments

Parking Brake Assembly:

Adjust the drum brakes before adjusting the parking brake cables. Adjustments

Initial Adjustment Procedure (Use this procedure when a new tension limiter is installed).

Cable Tension Limiter Assembly:

1. Depress the parking brake pedal fully to the last detent position.

2. Grip the Tension Limiter housing to prevent it from spinning and tighten the equalizer nut 63.50mm +\- 3.175mm (2 1/2 inch +\- 1/8 inch) up the rod.

3. Check to make sure cinch strap has slipped (less than 34.925mm or 1 3/8 inch remaining).


Field Adjustment (Use this procedure to correct a slack system if new tension limiter is not installed)

1. Make sure brake drums are cold for correct adjustment.

2. Release the parking brake control.

3. Grip the tension limiter housing to prevent it from spinning and tighten the equalizer nut 6 full turns past its original position on the threaded rod.

4. Fully depress pedal to the last detent position and check for proper rear cable tension of 1556 N or (350 lbs). If tension is low repeat steps 2 and 3.

5. Release parking brake and check for rear wheel drag.

Parking Brake Lever Clearance:

6. If rear wheel brake drag is noted after adjustment the rear drums must be removed after the service and parking brakes have been adjusted. Check the clearance between the parking brake lever and the cam plate. The clearance should be 0.38mm (0.015 inch) with the brakes fully released. If the clearance is not within specifications, readjust the parking brake cable.

NOTE: The tension limiter will reset the parking brake tension anytime the system is disconnected provided the distance between the bracket and the cinch strap hook is reduced during adjustment. When the cinch strap hook contacts the bracket, the system tension will increase significantly and over tensioning may result. If all available adjustment travel has been used, the tension limiter must be replaced.

7. Place the parking brake pedal in the fully released position, then check the slack in the parking brake two rear cables.

The cables should be tight enough to provide full application of the rear brake shoes, when the parking brake lever or foot pedal is placed in the fully applied position, yet loose enough to ensure complete release of the brake shoes when the lever is in the released position.