Ford F-650 2015 Owner's Manual page 146

Initial Charge
B
A
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.
You can push in the parking brake (B – yellow knob) and supply air to
the tractor spring brakes, releasing them.
2015 F-650/750 (f67)
Owners Guide gf (ownloose), 1st Printing, December 2013
Canadian_French (fr_can)
Brakes
The parking brake controls the
spring brakes on the tractor. When
you pull the knob out, it causes the
trailer supply valve to pop out,
applying both the tractor and trailer
parking brakes. You can indepdently
release the trailer brakes by pushing
only the trailer air supply valve in.
B
A
B
A
I n f o r ma t i o n P r o v i d e d b y :
145