Ford f-650 2013 Owner's Manual page 153

152
Trailer Air Supply and Parking Brake Modular Controls
(If Equipped)
Initial Charge
With the air system completely discharged, both knobs (A and B) are
out. When the air pressure reaches 70 psi (483 kPa), 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.
2013 F-650/750 (f67)
Owners Guide gf, 1st Printing, October 2012
USA (fus)
Brakes
The trailer air supply valve delivers
air to the trailer supply and
automatically pops out, shutting off
the trailer supply, if pressure
decreases to approximately 35 psi
(249 kPa).
The parking brake controls the spring
brakes on the tractor. When the knob
is pulled out, it causes the trailer
supply valve to pop out, applying
both the tractor and trailer parking
brakes. The trailer brakes may be
independently released by pushing
only the trailer air supply valve in.
B
A
B
A