TM 9-2330-383-14&P
2-3. AIR BRAKE AND SUSPENSION SYSTEM
a. Service Brakes. The service brakes are expanding shoe-on-drum type brakes.
The brake shoes are actuated by individual air chambers through camshafts. The air
chambers are connected to the air system tanks and valves through air hoses. The
rear brakes are normally automatically locked as parking brakes when the trailer is
disconnected from the towing vehicle. To unlock the rear brakes, push in on the
control valve knob (1). If there is not enough air in the air tank, the control
valve knob will pop back out and the rear brakes will remain locked. If the brakes
cannot be released with the control valve, refer to para. 3-6 and mechanically
release the brakes by caging the spring brake chamber.
b. Intervehicular Air Hoses. Air for operation of the trailer brakes is provided
from the towing vehicle through two intervehicular air hoses (2) attached to the
front of the trailer. The hoses are for service brake operation and for the
emergency system. Both hoses have gladhand couplings (3) for quick secure
connection to the tow vehicle.
c. Suspension System. The trailer suspension system includes front and rear
systems. The front suspension system has left and right side air-bag springs (1)
and shocks (2) attached to hanger (3) and shock brackets (4). The illustration
shown is for the left side. The rear suspension system consists of right and left
air-bag springs (1) and shocks (2) attached to hanger (3) and shock brackets (4).
2-4
