TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 97 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-20.
BRAKE SYSTEM (Continued).
b.
Brake System Components (Continued).
(13)
Tractor Protection Valve.
Directs air pressure from brake treadle valve or trailer supply valve to rear gladhands and couplings
(14)
Double Check and Quick Release Valve.
Primarily functions as an exhaust valve for the spring chamber of the forward-rear axle brake valve.
Also prevents
service and emergency brake application from occurring at the same time.
TA 236795
1-76
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