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 1026 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
20.
IS THERE A BLOCKAGE IN THE LIMITING VALVE AIR SUPPLY LINE?
a.
Stop engine and open all draincocks until brake system air pressure is vented.
b.
Close all draincocks.
c.
Disconnect pressure gauge from air supply line.
Transducer
T0219DAA
Limiting Valve
Air Supply Line
Figure 19.
Limiting Valve.
d.
Check air supply line for blockage.
CONDITION/INDICATION
IS THERE A BLOCKAGE IN THE LIMITING VALVE AIR SUPPLY LINE?
DECISION
NO - Go to Step (21).
YES - Repair or replace blocked air line (Volume 5, WP
0805). Go to Step (30) to verify problem is solved.
TM 9-2320-272-23-1
0120
0120-37
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