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 1041 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
28.
IS THERE PROPER AIR PRESSURE IN SUPPLY LINE FROM SECONDARY 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.
T0198DAA
Supply
Line
Secondary
Air System
Relay Valve
Transducer
Figure 27.
Secondary Relay Valve Supply Port.
TM 9-2320-272-23-1
0120
0120-52
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