Reflectors (3). Safety devices that allow other vehicles to see the lube unit.
Emergency and Service Brake Couplers (4). Connects the braking system of the trailer to that of the towing
Trailer Air Tank (5). Stores air for use with the trailer air brake system.
Parking Brake (6). Activates brakes for the parking unit. Use with wheel chocks (7).
Emergency Relay Valve (8). Receives air from the emergency and service brake couplers and sends it to the
trailer air tank. This is used to apply the emergency brakes if a sudden pressure drop is sensed such as if the
trailer broke away from the towing vehicle.
Junction Box (9). Connects towing vehicle wiring and power to trailer.
Brake Hose Assemblies (10). Connects trailer air brake system to towing vehicle.
12 VDC and 24 VDC Intervehicle Electrical Cable Assemblies (11) Provides electrical power from towing vehicle
to trailer junction box.