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
