ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
AIR SYSTEM AND BRAKES - CONTINUED
BRAKES UNEVEN OR ERRATIC - CONTINUED
Drain air from system before removing lines or fittings to avoid personnel injury from compressed air.
Step 7. Test brake pedal valve (1) for delivery pressure.
a. Turn draincocks (2) open, let air drain, and close draincocks (2).
Always use a pressure gage known to be accurate when testing. Do not rely on instrument panel gages.
b. Open left side hood panel (3) (page 2-7), and install in-line pressure gage between hose (4) and
valve outlet port (5).
c. Have assistant start engine (TM 9-2320-269-10), let air pressure build up, and shut off engine.
d. Have assistant depress brake pedal (6), hold at several positions, then depress fully, and hold.
e. Gage reading should vary proportionately with pedal travel and show full reservoir pressure, 105
psi (723.97 kPa), with pedal (6) depressed.
f. Have assistant release pedal (6), turn draincocks (2) open, let air drain, and turn draincocks (2)
g. Remove pressure gage, replace valve (1) (page 2-587) if not working properly, and close hood