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 1063 of 1313
VEHICLE VIBRATES, CHATTERS, OR BOUNCES WHEN BRAKES ARE APPLIED - Continued
STEP
2.
IS THERE EVIDENCE OF BRAKE SYSTEM AIR LEAKS?
a.
Check for brake system air leaks.
b.
Start engine and run to build air supply to normal operating pressure.
c.
Assistant fully applies service brakes.
d.
Listen for leaking air lines or fittings. Refer to point to point schematics.
CONDITION/INDICATION
IS THERE EVIDENCE OF BRAKE SYSTEM AIR LEAKS?
DECISION
YES - Replace damaged air lines (Volume 5, WP
0805). Go to Step (4) to verify problem is solved.
NO - Go to Step (2).
STEP
3.
DO REAR BRAKE CHAMBERS HAVE PROPER AIR PRESSURE?
a.
Check rear service brakes for proper air pressure.
b.
Stop engine and open all draincocks until brake system air pressure is vented.
c.
Close all draincocks.
T0241DAA
Figure 1.
Rear Service Brake Chamber.
TM 9-2320-272-23-1
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