Initial charge
With the air system completely discharged, both knobs (1 and 2) will be
out. When the air pressure reaches 70 psi (483 kPa) the trailer air
supply (1 – red knob) may be pushed in and should stay in charging the
trailer air system and releasing the trailer brakes.
The parking brake (2–yellow knob) can now be pushed in and supply air
to the tractor spring brakes, releasing them.
1
2
1
2
1
2
2006 F-650/750 (f67)
Supplement
USA (fus)
Driving
114
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