Ford Probe Owner's Manual page 159

If the brake pedal is applied while the vehicle is
driven over uneven road surfaces, the ABS may
cycle and the driver may sense a pulsation in
the brake pedal, accompanied by a slight up and
down movement of the pedal height and a
clicking sound. This may also happen when
driving on an inclined surface such as a
driveway while making a sharp turn. This is a
normal condition.
Each time you turn the ignition key to the ON
position, the ABS will function through one test
cycle. When this happens, the ABS light will
come on for up to five seconds. If the light stays
on longer than five seconds, shut off the engine
and restart. If it remains on, it means the ABS is
disabled and should be serviced immediately to
restore the benefits of the anti-lock feature.
Normal braking is not affected unless the red
BRAKE system warning light is also lit.
ABS has self-check capabilities. As described
above, the system turns on the ABS light each
time you start your engine. After the engine is
started and the ABS light turns off, the system
performs another test the first time the vehicle
reaches 4-9 mph (6-15 km/h). The system turns
on the ABS pump motor for approximately 1/2
second. At this time, a mechanical noise may be
heard. This is a normal part of the self-check
feature. If a malfunction is found during this
check the ABS light will come on.
Ford Motor Company has not found any
detrimental effects of popular mobile road
transmitting equipment installed on vehicles
equipped with the Anti-lock Brake System if
normal radio installation practices are rigidly
followed. However, if after installing mobile
radio transmitting equipment, the Anti-lock
Brake System light comes on at any time other
than immediately after turning the key to the
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