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Ford F-650 Owner's Manual page 132

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Initial Charge

With the air system completely discharged,

both knobs (A and B) are out. When the

air pressure reaches 70 psi (4.83 bar), the

trailer air supply (A - red knob) may be

pushed in and should stay in, charging the

trailer air system and releasing the trailer

F650750 (TBC), enUSA, First Printing

You can push in the parking brake (B -

yellow knob) and supply air to the tractor

spring brakes, releasing them.

Normal Driving Position

Push in both knobs (A and B) to supply air

to both trailer and tractor spring brakes,

releasing all brakes.

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