Parking Brake Control Valve
Note: See Brake System General Information for detailed information about brake systems.
Notice: Do not step on the service brake pedal while the parking brakes are applied. To do so can cause damage to the brake mechanisms.
The yellow diamond-shaped knob operates the parking brake valve. Pulling the knob out applies both the tractor and trailer spring parking brakes. See Fig.. Pushing the knob in releases the tractor spring parking brakes.
If the trailer is not equipped with spring parking brakes, pulling out the parking brake valve applies the tractor parking brakes and the trailer service brakes.
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Trailer Air Supply Valve (red knob)
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Parking Brake Control Valve (yellow knob)