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 1033 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
24.
IS PROPER AIR PRESSURE AT PRIMARY RELAY VALVE?
a.
Stop engine and open all draincocks until brake system air pressure is vented.
b.
Close all draincocks.
c.
Disconnect pressure gauge from vehicle and return air line to original condition.
DELIVERY
PORT
T0225DAA
TRANSDUCER
ELBOW
DELIVERY LINE
Figure 23.
Primary Relay Valve Delivery Port.
TM 9-2320-272-23-1
0120
0120-44
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