Chevrolet 1998 C/K Full-Size Pickup Owner's Manual page 110

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.
If you have a 3500
HD
model, it is recommended that
the propshaft mounted parking brake be burnished as
part of the new vehicle break-in. The parking brake
will work best after it has been burnished following
these instructions.
Make 10 stops, using the parking brake foot pedal, from
20 mph (32 km/h)
about 2 1/2 miles (4 km) apart. In
between stops, drive the vehicle at 20 mph (32 kdh).
Shifting Into PARK (P) (Automatic
Transmission Only)
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 have four-wheel drive and your transfer case is
in NEUTRAL (N), your vehicle will be free to roll,
even if your shift lever is in PARK
(P).
So,
be sure
the transfer case is in a drive gear
--
not in
NEUTRAL (N). I f you're pulling a trailer,
see
"Towing a Trailer" in the Index.
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