GMC C-Series 2001 Owner's Manual page 143

A computer senses that wheels are slowing down. If one
of the wheels is about to stop rolling, the computer will
separately work the brakes at each wheel.
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The anti lock system can change the brake pressure
faster than any driver could. The computer is
programmed to make the most of available tire and road
conditions. This can help you steer around the obstacle
while braking hard.
As you brake, your computer keeps receiving updates on
wheel speed and controls braking pressure accordingly.
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Remember: Anti lock doesn't change the time you need
to get your foot up to the brake pedal or always decrease
stopping distance. If you get too close to the vehicle in
front of you, you won't have time to apply your brakes
if that vehicle suddenly slows or stops. Always leave
enough room up ahead to stop, even though you have
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anti lock brakes.
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Using Anti Lock
Don't pump the brakes. Just hold the brake pedal down
-
firmly and let anti lock work for you. You may feel the
brakes pulsate, or you may hear air exhausting, but this
is normal.
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