Buick 1994 LeSabre Owner's Manual page 112

Brake System Warning Light
BRAKE
Your Buick's hydraulic brake system is divided into two
parts. If one part isn't working, the other part can still
work and stop you. For good braking, though, you need
both parts working well.
If the warning light comes on, there could be a brake
problem. Have your brake system inspected right away.
This light should come on as you start the vehicle. If it
doesn't come on then, have it fixed so it will be ready to
warn you if there's a problem.
If the light and chime come 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, have the vehicle towed for service. (See "Towing
Your Car" in the Index.)
The brake system warning light will also come on when
you set your parking brake, and it will stay on if your
parking brake doesn't release fully. If you try to drive
off with the parking brake set, a chime will also come on
until you release the parking brake.
If the light and
chime stay on after your parking brake is fully released,
it means you have a brake problem.
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