Ford F-650 2015 Owner's Manual page 155

154
WARNING: This control is used for parking only. Do not leave
the vehicle unattended after setting the parking brake without
placing the transmission inposition R for vehicles equipped with manual
transmission or position N (except Allison 2200 transmission) or P
(Allison 2200 transmission) for vehicles with automatic transmission.
Use of wheel chocks is also recommended in hilly or off-road usage.
The parking brake light illuminates and remains illuminated
P
(when you switch the ignition to the on position) until you
release the parking brake.
Releasing Spring Brake with Air Pressure
The air system in all vehicles with spring-actuated rear wheel parking
brakes is equipped with a tank valve located on the supply or service air
tank for connection to an outside air supply. The valve lets you recharge
the system with air from an outside source, releasing the spring-actuated
parking brakes. Your vehicle is now ready to tow in an emergency.
You can only use an outside air source if the protected system is in
operating condition. If you cannot restore air pressure in the protected
air system, you must release the spring-actuated brakes manually.
Releasing Spring Manually
WARNING: Do not attempt to disassemble the parking brake
chamber under any circumstances. The high spring load may
cause serious injury if the chamber clamps are removed.
If you release air pressure from the spring brake chamber, the power
spring applies the brake and, unless air pressure can be re-established,
you must release the spring brake as follows in order to move your
vehicle.
2015 F-650/750 (f67)
Owners Guide gf, 2nd Printing, April 2014
USA (fus)
Brakes
Pull the yellow parking brake knob
out to apply the parking brake.
Push the knob in to release the
parking brake.