Cadillac 2002 DeVille Owner's Manual page 103

Reach under the driver's side of the instrument panel
and pull down on the manual release lever, which is
located behind the parking brake pedal. Pull down on
the yellow tab as shown by the arrow in the illustration.
If the parking brake does not release, you should have
your vehicle towed to your dealer for service.
NOTICE:
Driving with the parking brake on can cause
your rear brakes to overheat. You may have to
replace them and you could also damage other
parts of your vehicle.
If you are towing a trailer and are parking on a hill, see
"Towing a Trailer" in the Index.
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