TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 1028 of 1313
INSUFFICIENT BRAKES (VEHICLE STOPPING DISTANCE TOO LONG, NO APPARENT AIR SYSTEM
FAILURE WITH GAUGES AT NORMAL OPERATING PRESSURE, WARNING BUZZER NOT SOUNDING) -
Continued
e.
Disconnect double check #1 valve air supply line (Volume 3, WP
0473). Refer to point to point
schematics.
f.
Connect pressure gauge to disconnected air supply line.
g.
Assistant starts engine and runs to build air supply to normal operating pressure.
h.
Assistant fully applies and holds service brakes.
i.
Monitor air pressure on pressure gauge.
j.
Pressure gauge should read 90 to 130 psi.
CONDITION/INDICATION
IS PROPER AIR SUPPLY PRESSURE AT DOUBLE CHECK VALVE #1?
DECISION
NO - Go to Step (22).
YES - Replace double check valve #1 (Volume 3, WP
0473). Go to Step (30) to verify problem is solved.
TM 9-2320-272-23-1
0120
0120-39
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