TM 9-2330-390-14&P
1-18. BRAKE SYSTEM (Con’t).
Key
Component
4
Pivoting Tray Gladhands
Description
Provide quick disconnect air connections between front and rear
dollies and second dolly set when towed in tandem.
5
Intradolly Airbrake Hoses
Route service and emergency air from front dolly to rear dolly.
6
Shutoff Valves
Open to supply air to second dolly set when tandem towing.
(With Levers)
Close when tandem towing is complete.
7
Booster Relay Valves
Provide service brake air pressure to allow proper brake operation.
8
Relay Valve
Closes service line from towing vehicle when parking brake lever on
rear dolly has vented air from supply line to apply parking brakes.
Prevents rear dolly service brakes from being applied at same time
as parking brakes. Also prevents towing vehicle brakes from locking
up.
9
Air Reservoirs
Store compressed air to operate brakes. Each reservoir has a
manually operated draincock which allows release of compressed
air and drainage of condensation and other contaminants from
airbrake system.
10
Parking Brake Lever
11
Airbrake Control Knob
Applies and releases parking brakes on rear dolly.
Applies or releases front and rear dolly service brakes when dolly
set is uncoupled from towing vehicle.
12
Full Function Valve
With emergency line and air reservoir pressurized, senses service
brake pressure from towing vehicle and applies or releases air to
service airbrake chambers to apply or release brakes. In addition,
controls spring brakes.
1-19. STEERING SYSTEM.
a.
The steering system provides ground mobility when positioning front and rear dollies for attachment to a
shelter. Once attached, the steering system provides similar mobility while the dolly set trailer is towed.
b.
Major components of the steering system include the following:
1-35
