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

  TM-9-2320-272-23-1 - Page 998 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
NOTE
Air pressure to service brake chambers must compare with reading on primary air
pressure gauge. Air pressure to spring and service brake chambers must compare with
reading on secondary air pressure gauge.
h.
Assistant fully applies and holds service brakes while comparing pressure gauge reading to instrument
panel primary air pressure gauge reading.
i.
Pressure gauge should read 90 to 130 psi.
j.
Both readings should be similar.
CONDITION/INDICATION
IS THERE PROPER AIR PRESSURE AT THE RIGHT FORWARD-REAR REAR SERVICE BRAKE
CHAMBER?
DECISION
NO - Go to Step (9).
YES - Go to Step (6).
TM 9-2320-272-23-1
0120
0120-9


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