Parking Brake - Hummer 2003 H2 Owner's Manual

Parking Brake

To set the parking brake, hold the regular brake pedal
down with your right foot. Push down the parking brake
pedal with your left foot.
If the ignition is on, the brake system warning light will
flash. A chime will activate when the parking brake is
applied and the vehicle is moved at least 3 mph (5 km/h)
for at least three seconds.
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To release the parking brake, hold the regular brake pedal
down. Pull the bottom edge of the lever, located above
the parking brake pedal to release the parking brake.
If the ignition is on when the parking brake is released,
the brake system warning light will go off.
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. That section
shows what to do first to keep the trailer from moving.