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 1029 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
22.
IS PROPER AIR PRESSURE AT SERVICE BRAKE PEDAL VALVE PRIMARY AIR SYSTEM DELIVERY
PORT?
a.
Stop engine and open all draincocks until brake system air pressure is vented.
b.
Close all draincocks.
WARNING
•
Do not depress service brake pedal during removal of plug and/or installation of test
gauge. Failure to comply may result in injury or death to personnel.
•
Remove correct plug only. Failure to comply may result in injury or death to
personnel.
c.
Direct assistant to keep foot off service brake pedal.
d.
Disconnect pressure gauge from vehicle and return air line to original condition.
SERVICE BRAKE
PEDAL VALVE
T0222DAA
TRANSDUCER
SERVICE
BRAKE PEDAL
PRIMARY AIR SYSTEM
DELIVERY POINT
PLUG
Figure 21.
Service Brake Pedal Valve.
TM 9-2320-272-23-1
0120
0120-40
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