2-23. Manually Compressing the Spring Brake Power Springs.
In the event of an air system pressure loss, spring brake units on the forward-rear axle
will apply the forward-rear axle brakes. If the truck must be moved and there is not
enough air system pressure to compress the power spring in the spring brake chambers
and release the brakes, you will have to do this manually. The truck has two spring
To compress the power spring in each unit:
1. Using the adjustable wrench (See appendix B), remove the nut, washer and release
stud from the stowage pocket of the failed chamber.
2. Remove cap (dust-cover) from spring chamber.
3. Insert the cross-pin end of the release stud into the opening (under the cap) in
the spring chamber.