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 1035 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
25.
IS THERE PROPER AIR PRESSURE IN SUPPLY LINE FROM PRIMARY AIR TANK TO 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 and elbow to original condition.
T0193DAA
Primary
Air System
Relay Valve
Coupling
Transducer
Supply Line
Figure 24.
Primary Relay Valve Supply Port.
TM 9-2320-272-23-1
0120
0120-46
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