Ford F-650 2025 Owner's Manual page 145

The parking brake warning lamp
illuminates and remains
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illuminated until you release the
parking brake.
Releasing the Parking Brake
WARNING: When your vehicle is
stationary, keep the brake pedal fully
pressed when shifting gears. Failure to
follow this instruction could result in
personal injury, death or property
damage.
Note: Read and understand the following
steps and perform them whenever you
prepare to drive the vehicle.
Note: The parking brake does not disengage
unless sufficient system air pressure is
available.
1. Press and hold the service brake pedal
while the engine is running.
2. Select the appropriate drive gear.
3. Push and hold the yellow
dash-mounted parking brake knob until
the parking brake warning lamp turns
off, then release.
Parking Brake Light Illumination Due
to Low Air Pressure
If the air pressure becomes too low at any
time during vehicle operation, the parking
brake may apply and the parking brake
warning lamp turns on.
If the parking brake applies due to low air
pressure, immediate service is required to
the parking brake system.
2025 F-650/750 (TBC) , enUSA, Edition date: 202310, First-Printing
Brakes
Releasing Spring Brake with Air
Pressure
The air system in all vehicles with
spring-actuated rear wheel parking brakes
has a valve on the governor 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 an operating
condition. If you cannot restore air pressure
in the protected air system, you must
manually release the spring-actuated
brakes.
Releasing Spring Manually
Do not use impact wrenches as they may
damage the piston and prevent proper
caging of the spring. Do not apply more
than 50 lb.ft (68 Nm) to the release bolt
nut.
1. Remove the stud tool and nut from the
carrying pocket on the brake chamber
assembly.
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2. Remove the access plug from the end
of the spring chamber.
3. Insert the release stud through the
opening in the chamber and into the
spring pressure plate.
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