Anti-Lock Brakes - Pontiac 1993 Trans Sport Owner's Manual

Your Driving and the Road
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Anti-Lock Brakes
(CONTJ
This light on the instrument panel will
go on when you start your vehicle.
Your anti-lock brake system has a two-
part system check:
*
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. (You may also hear this
noise if you leave the ignition in the
Run position for about four seconds
before starting the vehicle.)
If you have your foot on the brake
pedal, this check won't happen until
the vehicle goes about 4 mph (6 krn/h)
1 5 0
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 the Index under Anti-Lock
Brake System Warning Light.
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.
A computer senses that wheels are
slowing down. The computer separately
works the brakes at each front wheel
and at the rear wheels.
The anti-lock system can change the
brake pressure faster than any driver
could. The computer is programmed to
mpke the most of available tire and road
conditions.