Winch Brake
Notice: Due to the possibility of the winch brake failing and causing the vehicle to unexpectedly roll backwards, no one other than the operator should be in the cab while the winch brake is in use.
A winch brake is an optional accessory. If equipped, vehicles involved in winching applications, such as tow trucks, need the vehicle to remain stationary while applying a heavy pulling force. Park brakes apply pressure to the rear axles and may not be enough to hold the vehicle in position. A winch brake applies approximately 44 psi (303 kPa) to the forward axle to assist in keeping the vehicle stationary.
The winch brake operates under the following conditions:
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the engine is on;
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the park brake is set;
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the air pressure is greater than 100 psi (689 kPa) in both the primary and secondary systems.
To engage the winch brake, toggle up on the winch brake switch. See Fig..
Fig. 1, Winch Brake Switch
The icon on the winch brake switch illuminates red and the application air gauge displays approximately 44 psi (303 kPa) while the winch brake is active. If an error occurs while engaging the winch brake, the icon on the switch flashes red and the application air gauge displays 0 psi (0 kPa).
To disengage the winch brake, press on the brake pedal while toggling up on the winch brake switch or changing gears.