GMC 1993 Suburban Owner's Manual page 87

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To set the parking brake:
K2221
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 come on.
To
release the parking brake:
Hold the regular brake pedal down. Pull the lever marked RELEASE.
If you are on a hill:
See ''Parking on Hills" in the Index. That part shows how to turn your front
wheels.
If
YOU
are towing a trailer and are parking on any hill:
See "Towing a Trailer" in the Index. That part shows what to do first to keep
the trailer from moving.
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