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 1048 of 1313
VEHICLE PULLS RIGHT OR LEFT WHEN APPLYING BRAKES - Continued
d.
Disconnect delivery line from service brake chamber adapter fitting (Volume 3, WP
0434). Refer to point
to point schematics.
e.
Connect tee between disconnected service brake chamber and delivery line.
f.
Connect pressure gauge to tee.
g.
Assistant starts engine and runs to build air supply to normal operating pressure.
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
DO FRONT BRAKE CHAMBERS HAVE PROPER AIR PRESSURE?
DECISION
YES - Go to Step (3).
NO - Perform Insufficient Brakes troubleshooting (WP
0120).
TM 9-2320-272-23-1
0121
0121-3
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