Buick 1993 Skylark Owner's Manual page 152

When you start your vehicle and begin to drive away,
you may hear a momentary motor or clicking noise. And
you may even notice that your brake pedal moves a little
while this is going on. This is the ABS system testing
itself. If you have your foot on the brake pedal, this
check won't happen until the vehicle goes about 4.mph
(6
km/h)
or until you take your foot off the brake pedal.
After an ABS stop, you may hear a clicking noise the
next time the vehicle goes about 4 mph (6 km/h).
If there's a problem with the anti-lock brake system, the
anti-lock brake system warning light will stay on or
flash.
See "Anti-lock Brake System Warning Light" in the
Index.
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. Here's what happens with ABS.
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