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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.
WARNING:
Block the wheels to help prevent the vehicle from
moving.
WARNING:
Unexpected and possibly sudden vehicle movement
may occur if these precautions are not taken.
Do not use impact wrenches as they may damage the piston and prevent
proper caging of the spring. Do not apply more than 50 foot-pounds
(68 newton-meters) torque to the release bolt nut.
1. Remove the stud tool and nut
from the carrying pocket on the
brake chamber assembly.
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.
Brakes
153
2015 F-650/750
(f67)
Owners Guide gf
(ownloose)
, 1st Printing, December 2013
Canadian_French
(fr_can)