Pontiac 2002 Firebird Owner's Manual page 100

To release the parking brake, hold the brake pedal down.
Pull the parking brake lever up until you can push in the
release button. Hold the release button in as you move
the brake lever all the way down.
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NOTICE:
Driving with the parking brake on can cause
your parking 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 any hill,
see "Towing a Trailer" in the Index. That section
shows what to do first to keep the trailer from moving.