ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
REAR BRAKES DO NOT RELEASE.
Safety goggles must be worn when working with air lines to prevent personal injury.
Chock wheels of dump truck (TM 5-3805-254-10).
Check AIR PRESSURE gage for air pressure between 90 and 130 psi. If specified air pressure is
not present, start engine and check that air pressure in air system is between 90 and 130 psi (TM
5-3805-254-10). Shut down engine (TM 5-3805-254-10).
Step 1. Check parking brake hand valve (1) for air pressure as follows: pull handle out to apply parking
brakes, using 5/8-inch open-end wrench, loosen output hose fitting (2) six turns, push in handle
and listen for hissing noise.
a.If hissing noise is not heard, replace parking brake hand valve (1), notify Direct
b.If hissing noise is heard, pull out handle to apply brakes. Tighten output hose fitting
(2) using 5/8-inch open-end wrench, and go to step 2.