TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
70.
PARKING BRAKE DOES NOT RELEASE.
WARNING
Safety goggles must be worn when working with air lines to prevent personal injury.
Ensure that vehicle is on level ground and that rear wheels are chocked to prevent vehicle from
moving or severe injury to personnel may result.
NOTE
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 for proper operation of push rods (1) and slack adjusters (2) as follows: have assistant
release and apply PARKING BRAKE control valve (3) several times. Check for movement of push
rods (1) and slack adjusters (2).
a. If push rods (1) and slack adjusters (2) are not moving, go to step 2.
b. If push rods (1) and slack adjusters (2) are only moving on front rear axle (4), go to
step 7.
c. If push rods (1) and slack adjusters (2) are only moving on rear rear axle (5), go to
step 6.
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