Ford 1996 Windstar Manual page 243

Driving Your Windstar
Four-Wheel Anti-lock Brakes
The Anti-lock Brake System (ABS) prevents wheels from
completely locking up by automatically releasing and
re-applying the brakes. During ABS braking, slight brake pedal
pulsations may be felt on the driver's foot. These pulsations
represent the rapid cycling of the ABS valves. The pedal
pulsations are considered normal ABS operation, and will stop
when normal braking is resumed or when the vehicle comes to
a stop.
During ABS activation, a mechanical noise may be heard as the
ABS system cycles. This is normal ABS operation.
The ABS system has self-check capabilities. The system turns on
the ABS warning light each time you start the engine. After the
engine is started and the ABS warning light turns off, the
system performs another test the first time the vehicle reaches
4 mph (6 km/h). A mechanical noise may be heard as the ABS
system performs a self test. This is a normal part of the self test
feature. If a malfunction is found during this check, the ABS
warning light will come on.
The anti-lock brake system light
You should always be careful when braking, even if your
vehicle has the ABS system. Heavy braking on roads with loose
surfaces such as snow or gravel, or roads with severe pavement
irregularities could also cause you to lose control of your
vehicle.
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