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Initial Charge
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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
brakes.
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You can push in the parking brake (B -
yellow knob) and supply air to the tractor
spring brakes, releasing them.
Normal Driving Position
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Push in both knobs (A and B) to supply air
to both trailer and tractor spring brakes,
releasing all brakes.
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F650750 (TBC), enUSA, First Printing
Brakes