Cadillac 1999 Eldorado Owner's Manual page 82

Reach under the driver's side of the instrument panel
and pull on the manual release lever, which is located
above the parking brake pedal. If the parking brake does
not release, you should either drive to the nearest service
station or have your vehicle towed.
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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. This section shows
what to do first to keep the trailer from moving.
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