Pontiac 2004 GTO - Manual (Page 83)

Parking Brake To set the parking brake, pull up on the parking brake
handle without pressing the release button. If the ignition
is on, the brake system warning light will come on.
See Brake System Warning Light on page 3-27.
To release the parking brake, hold the regular brake
pedal down. Pull the parking brake handle up until you
can press the release button. Hold the release button
in as you move the brake handle all the way down.
Notice: Driving with the parking brake on can
overheat the brake system and cause premature
wear or damage to brake system parts. Verify that
the parking brake is fully released and the brake
warning light is off before driving.
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