Trailer Air Supply Switch
Note: See the Brake Systems chapter for detailed information about brake systems.
The switch with the red octagonal icon operates the trailer air supply, which charges the trailer air supply system and releases the trailer spring parking brakes.
The switch with a red octagonal-shaped icon in the control panel actuates the trailer air supply. See Fig. , item 2. After the vehicle's air hoses are connected to a trailer, the pressure in both air systems is at least 100 psi (690 kPa), and the keyswitch is ON, the trailer air supply switch must be pushed. For some tractor and trailer configurations, it may take longer than 3 seconds for the trailer air tanks to fill. In such cases, press and hold the trailer air supply switch until the trailer is fully supplied.
The LED indicator in the switch illuminates when the air is not supplied, blinks when the system is pressurizing but not yet ready, and extinguishes when the system is fully pressurized.
Note: When driving without a trailer, the LED in the trailer air supply switch remains illuminated.
-
Trailer Brake Lever
-
Trailer Air Supply Switch (red octagon)
-
Parking Brake Switch (yellow diamond)