Chevrolet 2001 Lumina Owner's Manual page 155

When you start your engine, or when you begin to drive
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away, your anti lock brake system will check itself. You
may hear a momentary motor or clicking noise while
this test is going on, and you may even notice that your
brake pedal moves or pulses a little. This is normal.
If there's a problem with the anti
-
anti lock brake system warning light will stay on. See
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"Anti Lock Brake System Warning Light" in the Index.
4-8
And this warning light on
the instrument panel will
come on briefly when you
start your vehicle.
-
lock brake system, the
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Here's how anti lock works. Let's say the road is wet.
You're driving safely. Suddenly an animal jumps out in
front of you.
You slam on the brakes and continue braking. Here's
what happens with ABS.
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 front wheel and at
both rear wheels.