Ford 750 2009 Owner's Manual page 15

Engine starting (parking brake applied)
Air brake check:
Automatic
transmission fluid:
2009 F-650/750 (f67)
Supplement
USA (fus)
Vehicle Inspection Guide
Check the air brakes in the following manner
(Chock the wheels, if necessary. Push in the
parking brake and on tractors, also push in the
tractor parking brake knob):
1. Check the that air compressor or governor
cut-out pressure is approximately 120 psi
(827 kPa).
2. Turn off the engine and turn the key back
to ON, without starting the engine.
3. Without the brake pedal applied, note the
air pressure drop for one minute. It should be
less than 2 psi (14 kPa) for single vehicle and
3 psi (21 kPa) for combination vehicles.
4. Depress and hold the brake pedal with
90 psi (621 kPa) or more and make sure there
is no more than a 3 psi (21 kPa) per minute
leak; for combination vehicles, no more than
4 psi (28 kPa) per minute.
5. Pump the brake pedal to deplete the system
of air pressure. The warning light and chime
should activate at 57 psi (393 kPa).
6. Pump the brake pedal and make sure the
parking brake and trailer parking brake knobs
pop out at 20 psi (138 kPa) or higher.
With the engine idling at normal operating
temperature and the parking brake applied,
check the automatic transmission fluid. If fluid
needs to be added, place the transmission in
the appropriate gear as specified in the
transmission operator's manual and refer to
Transmission fluid in the Maintenance and
Specifications chapter.
15