314 OPERATION
Parking Brake/Trailer Supply Valves
Trucks/Tractors may have two air control valves on the instrument panel:
•
Trailer Supply (red octagonal knob)
•
System Park (yellow diamond knob)
W5001116
The System Park valve knob (yellow) should be pushed in first, after sufficient air pressure
is built up (apply foot brake to prevent vehicle from rolling). The Trailer Air Supply valve
knob may then be pushed in.
The Trailer Air Supply valve knob and System Park valve knob will automatically pop out if
the system pressure (both front and rear circuits) drops to 170 to 240 kPa (25 to 35 psi).
The tractor protection valve will then close, the tractor spring brakes will apply and the
trailer emergency system will be activated.
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