TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
67.
FRONT BRAKES DO NOT WORK.
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. Chock rear wheels of truck. Check both front wheel tee fittings (1) for air pressure as follows:
using 3/4-inch and 518-inch open-end wrenches, loosen input hose fitting (2) six turns. Have
assistant press down brake pedal (3), and listen for hissing noise. Have assistant release
brake pedal (3).
a.If hissing noise is not heard, go to step 2.
b.If hissing noise is heard, go to step 5.
TA243923
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