Chevrolet 1999 Lumina Owner's Manual page 113

If the warning light comes on, there is a brake problem.
Have your brake system inspected right away.
If the light comes on while you are driving, pull off the
road and stop carefully. You may notice that the pedal is
harder to push. Or, the pedal may go closer to the floor.
It may take longer to stop. If the light is still on, or if the
-
anti lock brake system warning light is flashing, have
the vehicle towed for service. (See "Anti
System Warning Light" and "Towing Your Vehicle" in
the Index.)
This light should come on
briefly when you turn the
ignition key to RUN. If it
doesn't come on then,
have it fixed so it will be
ready to warn you if there's
a problem.
-
Lock Brake
CAUTION:
Your brake system may not be working properly
if the brake system warning light is on. Driving
with the brake system warning light on can lead
to an accident. If the light is still on or if the
-
anti lock brake system warning light is flashing
after you've pulled off the road and stopped
carefully, have the vehicle towed for service.
When the ignition is on, the brake system warning light
will also come on when you set your parking brake. The
light will stay on if your parking brake doesn't release
fully. If it stays on after your parking brake is fully
released, it means you have a brake problem.
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