TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4. Check rear relay valve (6) for air pressure as follows: using 7/8-inch open-end wrench, loosen
output hose fitting (7) six turns. Have assistant press down brake pedal (8), listen for hissing
noise at output hose fitting (7), release brake pedal.
a.
If hissing noise is not heard at output hose fitting (7), replace rear relay valve (6),
notify Direct Support Maintenance.
b.
If hissing noise is heard at output hose fitting (7), tighten using 7/8inch open-end
wrench, and go to step 5.
Step 5. Check rear rear quick release valve (9) for air pressure as follows: have assistant press down
brake pedal (8) and release. Check for exhaust of air pressure from valve vent on bottom of rear
rear quick release valve (9).
a.
If air pressure is not vented when brake pedal (8) is released, replace rear rear
quick release valve (9), notify Direct Support Maintenance.
b.
If air pressure is vented when brake (8) pedal is released, go to step 6.
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