FORD 1999 E-450 - Manual (Page 134)

Type A
Type B
4. Apply the parking brake and turn
engine OFF.
5. Block the wheel that is diagonally
opposite the tire you are changing.
On E-Super Duty vehicles, the
parking brake is on the
transmission. Therefore, the vehicle
will not be prevented from moving
when a rear wheel is lifted, even if
the parking brake is applied. Be sure to block both directions of the
wheel that is diagonally opposite to the wheel that is being lifted.
If the vehicle slips off the jack, you or someone else could be
seriously injured.
HOOD
PUSH
ON
PUSH
OFF
Roadside emergencies
134