TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 68 of 1015
TM 9-2320-272-24-1
1-23. COMPRESSED AIR AND BRAKE SYSTEM OPERATION (Contd)
(2) The constant air pressure supply is distributed to the primary service airbrake system (para. e.)
and secondary airbrake system (para. c.) through a shutoff and check valve. Air pressure can either be fed
from or supplied to another vehicle through the emergency couplings.
1-58
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