Cadillac 1999 Eldorado Owner's Manual page 119

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, have the
vehicle towed for service. (See "Towing Your Vehicle"
in the Index.)
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 after you've
pulled off the road and stopped carefully, have
the vehicle towed for service.
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.
Parking Brake Indicator Light
This light should also come on briefly as you start the
vehicle. If it doesn't, have the light fixed so it will be
ready to remind you if the parking brake has not fully
released. For more information on how to release the
parking brake, see "Parking Brake" in the Index.
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This light comes on when
the parking brake is set, and
it will stay on if the parking
brake does not fully release.
If you try to drive with the
parking brake set, this light
will remain on.
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