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 1131 of 1313
SPRING BRAKES DO NOT RELEASE (VEHICLE BRAKES GRAB OR DRAG) - Continued
STEP
1.
CAN SPRING BRAKES BE RELEASED?
a.
Assistant starts engine and builds air supply to normal operating pressure.
T0295DAA
AIR PRESSURE
GAGE
SPRING BRAKE
RELEASE CONTROL
Figure 1.
Spring Brake Release Control.
b.
Assistant pulls out emergency spring brake release control and moves vehicle forward.
c.
Watch to see if any wheels with spring brakes do not turn.
CONDITION/INDICATION
CAN SPRING BRAKES BE RELEASED?
DECISION
NO - Only one wheel is not turning. Perform Vehicle Rear Brakes Grab Or Drag troubleshooting (WP
0122).
NO - No wheels with spring brakes turn. Go to Step (5).
YES - All wheels turn. Go to Step (2).
TM 9-2320-272-23-1
0135
0135-2
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