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Replace the leaking unit and the unit with the broken off caging bolt. We don't disassemble these due to the strong spring inside.

Some advice. Don't take your FMTV to any shop period. Learn the systems and fix your truck yourself. The hive here has figured out nearly every issue and posted solutions and can assist you. HOWEVER, to assist you, you will need to report back precise symptomatic information.

Yes, please open all three drain cocks on the air tank reservoirs and tell us if the truck will still roll. Air pressure is needed to release the brake shoes on the rear axle which is the only axle used for the parking brake. If the shoes are released without air available, the mechanical...

Still waiting to hear if the truck rolls with all air drained so at least we can eliminate stuck wedges on the rear axle as a cause.

Your rear brakes are not caged. If the truck won't roll with air drained, the problem is as described in post 12. If it WILL roll with air drained, the rear brake wedges are stuck.

Does the truck roll with no air pressure in the system? Please post a picture of the rear brake cans or pots or chambers, whatever term you prefer.

Oh boy. Look at the rear brake pots. Are there threaded rods protruding from the middle? If so remove them.

Are the rear brakes caged?