20
Figure 21 ― Rear axle parking brake
Figure 22 ― Rear axle parking brake release
Releasing the parking brakes
If all of the air has been evacuated from the pneumatic
system, it is possible to release the parking brakes by manually
compressing (caging) the spring brake actuator. Before
manually releasing parking brakes, chock the wheels to prevent
the vehicle from moving.
To manually release the spring brake:
1. Remove the dust plug from the parking brake chamber.
2. Remove the release nut and washer from the release bolt.
3. Slide the release bolt out of the holder.
4. Insert the compression screw assembly through the
opening in the rear of the spring chamber.
5. Turn the release bolt a quarter turn clockwise.
6. Using a wrench, turn the release bolt assembly nut until the
compression spring is 90–95 % caged.
7. Check to make sure the pushrod is retracting.
The spring brake is now mechanically caged.
// TOWING THE VEHICLE
Before attempting to tow the vehicle, you will need to release
the parking brakes.
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