FORD 2002 F-550 v.3 - Manual (Page 133)

“squeezing” the brakes. If you feel the front wheels begin to lock,
momentarily release the pedal and repeat the “squeeze” technique.
• We recommend that you familiarize yourself with how the RABS
performs. However, avoid unnecessary risks.
Four-wheel anti-lock brake system (ABS) (if equipped)
On vehicles equipped with a four–wheel anti-lock braking system (ABS),
a noise from the hydraulic pump motor and pulsation in the pedal may
be observed during ABS braking events. Pedal pulsation coupled with
noise while braking under panic conditions or on loose gravel, bumps,
wet or snowy roads is normal and indicates proper functioning of the
vehicle’s anti-lock brake system. If the vehicle has continuous vibration
or shudder in the steering wheel while braking, the vehicle should be
inspected by a qualified service technician.
The ABS operates by detecting the
onset of wheel lockup during brake
applications and compensates for
this tendency. The wheels are
prevented from locking even when
the brakes are firmly applied. The
accompanying illustration depicts
the advantage of an ABS equipped
vehicle (on bottom) to a non-ABS
equipped vehicle (on top) during hard braking with loss of front braking
traction.
Using four wheel ABS
• In an emergency or when maximum efficiency from the four wheel
ABS is required, apply continuous force on the brake. The four wheel
ABS will be activated immediately, thus allowing you to retain full
steering control of your vehicle and, providing there is sufficient
space, will enable you to avoid obstacles and bring the vehicle to a
controlled stop.
• The anti-lock system does not reduce stopping distance. Always leave
enough room between your vehicle and the vehicle in front of you to
stop.
• We recommend that you familiarize yourself with this braking
technique. However, avoid taking any unnecessary risks.
ABS warning lamp
ABS
The
ABS
warning lamp in the instrument cluster momentarily illuminates
when the ignition is turned to the ON position. If the light does not
illuminate momentarily at start up, remains on or continues to flash, the
ABS needs to be serviced.
Driving
133