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 1135 of 1313
SPRING BRAKES DO NOT RELEASE (VEHICLE BRAKES GRAB OR DRAG) - Continued
STEP
5.
IS AIR ESCAPING FROM QUICK RELEASE VALVE?
a.
Verify engine is running.
T0300DAA
AIR
INTAKE
STACK
Figure 5.
Air Intake Stack.
b.
Release parking brake.
c.
Listen at air intake stack for the sound of air escaping. Refer to point to point schematics.
CONDITION/INDICATION
IS AIR ESCAPING FROM QUICK RELEASE VALVE?
DECISION
NO - Go to Step (7).
YES - Replace defective quick release valve (Volume 3, WP
0477). Go to Step (8) to verify problem is solved.
TM 9-2320-272-23-1
0135
0135-6
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