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

  TM-9-2320-272-23-1 - Page 1122 of 1313

SECONDARY AIR SYSTEM FAILS TO MAINTAIN PRESSURE (NO MAJOR LEAKS, AIR CAN BE HEARD
ESCAPING INTO AIR INTAKE STACK, PARKING BRAKE APPLIED) - Continued
CONDITION/INDICATION
IS PROPER AIR PRESSURE AT SECONDARY RELAY VALVE?
DECISION
NO - Go to Step (2).
YES - Replace damaged air lines from secondary relay valve to rear brake chambers (Volume 5, WP
0805).
Go to Step (4) to verify problem is solved.
TM 9-2320-272-23-1
0133
0133-3


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