Chevrolet 1998 Express Van Owner's Manual page 96

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. Always check to be sure your parking
brake is fully released before you drive.
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.
It
can be dangerous to get out of your vehicle if
the shift lever is not fully in
PARK (P)
with the
parking brake firmly set. Your vehicle can roll.
If
you have left the engine running, the vehicle can
move suddenly. You or others could be injured.
To be sure your vehicle won't move, even when
you're on fairly level ground, use the steps that
follow.
If
you're pulling a trailer, see "Towing a
Trailer" in the Index.
1. Hold the brake pedal down with your right foot and
set the parking brake.