Chevrolet SUBURBAN 1993 Owner's Manual page 230

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6. Release the regular brakes.
CAUTION
It can be dangerous to get out of your vehicle i f the shift lever is no
fully in P (Park) wi-. 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,
when you're on fairly level ground, use the steps that follow.
If you have four-wheel drive and your transfer case is in N (Neutral),
your vehicle will be free to roll, even if your shift lever is in P (Park)
So, be sure the transfer case is in a drive gear-not in N (Neutral).
If you are parking on a hill, or if you're pulling a trailer, also see
I
"Parking On Hills" in the Index.
I
When You Are Ready to Leave After Parking on a Hill
1. Apply your regular brakes and hold the pedal down while you:
Start your engine.
Shift into a gear; and
Release the parking brake.
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the chocks.
4. Stop and have someone pick up and stow the chocks.
Maintenance When Trailer Towing
Your vehicle will need service more often when you're pulling a trailer. .See
the Maintenance Schedule for more on this. Things that are especially
important in trailer operation are automatic transmission fluid (don't overfill),
engine oil, axle lubricant, belts, cooling system, and brake adjustment. Each
of these is covered in this manual, and the Index will help you find them
quickly. If you're trailering, it's a good idea to review these sections before
you start your trip.
Check periodically to see that all hitch nuts and bolts are tight.
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