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 1047 of 1313
VEHICLE PULLS RIGHT OR LEFT WHEN APPLYING BRAKES - Continued
STEP
1.
ARE FRONT SERVICE BRAKES GRABBING?
a.
Determine which brake is grabbing.
b.
Start engine and drive vehicle under normal conditions.
c.
In a safe test area, bring vehicle to a hard, sudden stop.
d.
Inspect front wheels for excessive heat on wheel and drum.
e.
Inspect for smoke or skid marks.
CONDITION/INDICATION
ARE FRONT SERVICE BRAKES GRABBING?
DECISION
YES - Go to Step (3).
NO - Go to Step (2).
STEP
2.
DO FRONT BRAKE CHAMBERS HAVE PROPER AIR PRESSURE?
a.
Check front service brakes for proper air pressure.
b.
Stop engine and open all draincocks until brake system air pressure is vented.
c.
Close all draincocks.
T0228DAA
Figure 1.
Front Service Brake Chamber.
TM 9-2320-272-23-1
0121
0121-2
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