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 1134 of 1313
SPRING BRAKES DO NOT RELEASE (VEHICLE BRAKES GRAB OR DRAG) - Continued
STEP
4.
IS AIR PRESSURE AT PARKING BRAKE SUPPLY LINE?
a.
Verify engine is running.
T0299DAA
SUPPLY
LINE
Figure 4.
Parking Brake Valve.
WARNING
Loosen supply line at valve very slowly. Stop procedure and tighten fitting of supply line
the moment air begins to escape. Failure to comply may result in injury or death to
personnel.
b.
Slowly loosen valve supply line until any air escapes, then immediately tighten the line. Refer to point to
point schematics.
CONDITION/INDICATION
IS AIR PRESSURE AT PARKING BRAKE SUPPLY LINE?
DECISION
NO - Go to Step (5).
YES - Go to Step (6).
TM 9-2320-272-23-1
0135
0135-5
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