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 991 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
STEP
1.
DO ANY AIR LINES OR HOSES LEAK?
a.
Start engine and run to build air supply to normal operating pressure.
b.
Assistant fully applies service brakes.
c.
Listen for leaking air lines or fittings. Refer to point to point schematics.
CONDITION/INDICATION
DO ANY AIR LINES OR HOSES LEAK?
DECISION
YES - Replace damaged air lines (Volume 5, WP
0805). Go to Step (30) to verify problem is solved.
NO - Go to Step (2).
STEP
2.
DOES AIR LEAK THROUGH SERVICE BRAKE CHAMBER VENT LINES?
a.
Disconnect vent line from right front service brake chamber (Volume 3, WP
0434). Refer to point to point
schematics.
T0201DAA
Service Brake
Chamber
Vent Line
Vent Port
Figure 1.
Service Brake Chamber Vent Line.
TM 9-2320-272-23-1
0120
0120-2
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