TM 9-2330-390-14&P
1-18. BRAKE SYSTEM (Con’t).
FRONT DOLLY
REAR DOLLY
Key
1
Component
Intervehicular Airbrake
Hoses
Description
Route service and emergency air from towing vehicle to front dolly.
2
Pressure Protection Valve
Acts as a check valve. Allows air to flow only one way-from
emergency line to air reservoir.
3
Relay Emergency 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.
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