1993 CHEVROLET SUBURBAN tires

Features & Contmls
N (Neutral): Shift to this setting only when your vehicle needs to be towed or
when using a power take
off.
4L (Low): This setting also engages your front axle to give you extra traction,
but should be used only for off-road or on extremely slippery surfaces.
You can shift from
2H to 4H or from 4H to 2H while the vehicle is moving.
Your front axle will engage faster if you take your foot
off of the accelerator
for a few seconds after you shift. In extremely cold weather it may be
necessary to stop or slow the vehicle to shift out of
2H.
To shift into or out of 4L or N (Neutral):
1. Slow the vehicle to a roll, about 3 mph (5 km/h) and shift your
transmission into neutral.
2. Shift the transfer case shift lever in one continuous motion.
Don’t pause in
N (Neutral) as you shift the transfer case into 4L, or your
gears could clash.
Remember that driving in
4H or 4L may reduce fuel economy. Also, driving in
four-wheel drive on
dry pavement could cause your tires to wear faster and
make your transfer case harder to shift.
Front Axle Locking Feature
The front axle locks and unlocks automatically when you shift \
the transfer
case.
A slight delay for the axle to lock or unlock is normal. If the outside
temperature is very hot, or the vehicle has been used under hard driving
conditions, there may be a slight delay for the axle to unlock.
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Control of a Vehicle
You have three systems that make your vehicle go where you want it to go.
They are the brakes, the steering and the accelerator. All three systems have
to
do their work at the places where the tires meet the road.
I
AM409006
Sometimes, as when you’re driving on snow or ice, it’s easy to ask more of
those control systems than the tires and road can provide. Tha\
t means you
can lose control of your vehicle.
Braking
Braking action involves perception time and reaction time.
First, you have to decide to push on the brake pedal. That’s perception
time.
Then you have to bring up your foot and do it. That’s reaction time.
Average reaction time is about 3/4 of a second. But that’s only an average.
It might be less with one driver and as long as two or thre\
e seconds
or
more with another. Age, physical condition, alertness, coordinati\
on, and
eyesight all play a part.
So do alcohol, drugs and frustration. But even in 314
of a second, a vehicle moving at 60 mph (100 kmlh) travels 66 feet (20 m).
That could be a lot of distance in an emergency, so keeping enough space
between your vehicle and others is important.
And, of course, actual stopping distances vary greatly with the surface of the
road (whether it’s pavement
or gravel); the condition of the road (wet, dry,
icy); tire tread; and the condition of your brakes.
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Your Driving and the Road
Rear Drum Brakes
Your rear drum brakes don’t have the wear indicators, but if you ever hear a
rear brake rubbing noise, have the rear brake lining inspected.\

Also, the rear
brake drums should be removed and inspected each time the tire\
s are removed for rotation or changing. When you have the front brak\
es replaced,
have the rear brakes inspected, too.
Brake linings should always be replaced as complete axle sets. \
Brake Pedal Travel
See your dealer if the brake pedal does not return to normal height, or if
there is a rapid increase in pedal travel. This could be a sign of brake
trouble.
Brake Adjustment
Every time you make a brake stop, your disc brakes adjust for\
wear. If your
brake pedal goes down farther than normal, your rear drum brak\
es may need
adjustment. Adjust them by backing up and firmly applying the brakes a few
times.
Braking In Emergencies
Use your anti-lock braking system when you need to. With anti-lock, you \
can
steer and brake at the same time. In many emergencies, steerin\
g can help
you more than even the very best braking.
Steering
Power Steering
If you lose power steering assist because the engine stops or the\
system
fails to function, you can steer but it will take much more effort.
Steering Tips
Driving on Curves
It’s important to take curves at a reasonable speed.
A lot of the “driver lost control” accidents mentioned on the n\
ews happen on
curves. Here’s why:
Experienced driver
or beginner, each of us is subject to the same laws of
physics when driving on curves. The traction of the tires against the road
surface makes
it possible for the vehicle to change its path when you turn
the front wheels.
If there’s no traction, inertia will keep the vehicle going in
the same direction.
If you’ve ever tried to steer a vehicle on wet ice, you’ll \
understand this.
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The traction you can get in a curve depends on the condition of your tires
and the
road surface, the angle at which the curve is banked, and your
speed. While you’re in
a curve, speed is the one factor you can control.
Suppose you’re steering through a sharp curve. Then you suddenly
accelerate. Those two control systems-steering and acceleration-ca\
n
overwhelm those places where the tires meet the road and make \
you lose
control.
What should you do if this ever happens? Let up on the accel\
erator peaal,
steer the vehicle the way you want it
to go, and slow down.
Speed limit signs near curves warn that you should adjust your\
speed. Of
course, the posted speeds are based
on good weather and road conditions.
Under less favorable conditions you’ll want
to go slower.
If you need to reduce your speed as you approach a curve, do it before you
enter the curve, while your front wheels are straight ahead.
Try to adjust your speed so you can “drive” through the curve. Maintain a
reasonable, steady speed. Wait to accelerate until
you are out of the curve,
and then accelerate gently into the straightaway.
When you drive into
a curve at night, it’s harder to see the road ahead of
you because it bends away from the straight beams
of your lights. This is
one
good reason to drive slower.
Steering in Emergencies
There are times when steering can be more effective than braki\
ng. For
example, you come over a hill and find a truck stopped in your lane, or a
car suddenly pulls out from nowhere,
or a child darts out from between
parked cars and stops right in front of you. You can avoid these problems by
braking-if you can stop in time. But sometimes you can’t; there isn’t room.
That’s the time for evasive action-steering around the proble\
m.
Your vehicle can perform very well in emergencies like these. First \
apply your
brakes.
It is better
to remove as much speed as you can from a possible collision.
Then steer around the problem, to the left or right depending \
on the space
available.
An emergency like this requires close attention and a quick decision.
If you
are holding the steering wheel at the recommended
9 and 3 o’clock positions,
you can turn it a full
180 degrees very quickly without removing either hand.
But you have
to act fast, steer quickly, and just as quickly straighten the
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Loss of Control
Let’s review what driving experts say about what happens whe\
n the three
control systems (brakes, steering and acceleration) don’t ha\
ve enough friction
where the tires meet the road to do what the driver has asked.
In any emergency, don’t give up. Keep trying
to steer, and constantly seek an
escape route or area of less danger.
Skidding
In a skid, a driver can lose control of the vehicle. Defensive d\
rivers avoid
most skids by taking reasonable care suited
to existing conditions, and by not
“overdriving” those conditions. But skids are always possib\
le.
The three types of skids correspond
to your vehicle’s three control systems.
In the braking skid your wheels aren’t rolling. In the steering
or cornering
skid,
too much speed or steering in a curve causes tires to slip and lose
cornering force. And in the acceleration skid too much throttle causes the
driving wheels to spin.
A cornering skid and an acceleration skid are best handled by easing your
foot off the accelerator pedal. If your vehicle starts to slide (as when you turn
a corner on a wet, snow-
or ice-covered road), ease your foot off the
accelerator pedal as soon as you feel the vehicle start
to slide. Quickly steer
the way you want the vehicle
to go. If you start steering quickly enough, your
vehicle will straighten out. As it does, straighten the front wheels.
Of course, traction is reduced when water, snow, ice, gravel,
or other material
is on the road.
For safety, you’ll want to slow down and adjust your driving to
these conditions.
It is important to slow down on slippery surfaces because
stopping distance will be longer and vehicle control more limit\
ed.
While driving on a surface with reduced traction,
try your best to avoid
sudden steering, acceleration,
or braking (including engine braking by shifting
to a lower gear). Any sudden changes could cause the tires t\
o slide. You
may not realize the surface is slippery until your vehicle is \
skidding. Learn to
recognize warning clues-such as enough water, ice or packed snow on the
road to make a “mirrored surface”-and slow down when you have any\

doubt.
Remember: Any anti-lock braking system (ABS) helps avoid only the braking
skid. Steer the way you want
to go.
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Loading Your Vehicle for Off-Road Driving
There are some important things to remember about how to load \
your
vehicle.
The heaviest things should be on the load floor and forward of your rear
axle. Put heavier items as far forward as you can.
Be sure the load is secured properly, so driving on the off-road terrain
doesn’t toss things around.
rn CAUTION
m m
Cargo on the load floor piled higher than the seatbacks can be
thrown forward during
a sudden stop. You or your passengers
could
be injured. Keep cargo below the top of the seatbacks.
Unsecured
cargo on the load floor can be tossed about when
driving over rough terrain.
You or your passengers can be struck
by flying objects. Secure the cargo properly.
Heavy loads on the roof raise the vehicle’s center
of gravity,
making
.it more likely to roll over. You can be seriously or fatally
injured
if the vehicle rolls over. Put heavy loads inside the cargo
area, not on the roof. Keep
cargo in the cargo area as far
forward and
low as possible. I
You’ll find other important information in this manual. See “Vehicle Loading”,
“Luggage Carrier” and “Tires” in the Index.
Traveling to Remote Areas
It makes sense to plan your trip, especially when going to a \
:emote area.
Know the terrain and plan your route. You are much less likely
to get bad
surprises. Get accurate maps of trails and terrain.
Try to learn of any blocked
or closed roads.
It‘s also a good idea to travel with at least one other vehicle. If something
happens to one of them, the other can help quickly.
Does your vehicle have a winch?
If so, be sure to read the winch
instructions. In a remote area,
a winch can be handy if you get stuck. But
you’ll want to know how to use it properly.
Getting Familiar with Off-Road Driving
It’s a good idea to practice in an area that’s safe and close to home befor\
e
you go into the wilderness. Off-road driving does require some \
new and
different driving skills. Here’s what
we mean.
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Your Driving and the Road
0
0
For
A hill that can be driven straight up or down may be too steep to drive
across. When you go straight up or down a hill, the length o\
f the wheel
base (the distance from the front wheels to the rear wheels) reduces the
likelihood the vehicle will tumble end over end. But when you drive
across an incline, the much more narrow track width (the dist\
ance
between the left and right wheels) may not prevent the vehicl\
e from
tilting and rolling over.
Also, driving across an incline puts more weight
on the downhill wheels. This could cause a downhill slide
or a rollover.
Surface conditions can be a problem when you drive across a
hill. Loose
gravel, muddy spots, or even wet grass can cause your tires to slip
sideways, downhill.
If the vehicle slips sideways, it can hit something that
will trip
it (a rock, a rut, etc.) and roll over.
Hidden obstacles can make the steepness
of the incline even worse. If
you drive across a rock with the uphill wheels, or if the do\
wnhill wheels
drop into a rut or depression, your vehicle can tilt even more.
reasons like these, you need to decide carefully whether to try to drive
across an incline. Just because the trail goes across the incline doesn’t mean
you have to drive it. The last vehicle to try it might have rolled over.
CAUTION
A
Driving across an incline that’s too steep will make your vehicle roll
over. You could be seriously injured or killed.
If you have any doubt
about the steepness of the incline, don’t drive across it. \
Find another route instead.
I
Q: What if I’m driving across an incline that’s not too steep, but I hit
some loose gravel and start
to slide downhill. What should I do?
A: If you feel your vehicle starting to slide sideways, turn down\
hill. This
should help straighten out the vehicle and prevent the side sl\
ipping. However, a much better way to prevent this is to get out and “walk the course”
so you
know what the surface is like before you drive
it.
Stalling on an Incline
If your vehicle stalls when you’re crossing an incline, be sure you (and your
passengers) get out on the uphill side, even
if the door there is harder to
open.
If you get out on the downhill side and the vehicle starts to roll over,
you’ll be right in its path.
If you have to walk down the slope, stay out of the path the vehicle will take
if it does roll over.
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AM440002
I Getting out on the downhill (low) side of a vehicle stopped across an
- , incline is dangerous. If the vehicle rolls over, you could be crushed
or killed. Always get out on the uphill (high) side of the vehicle and
stay well clear of the rollover path. F
Driving In Mud, Sand, Snow, Or Ice
When you drive in mud, snow or sand, your wheels won’t get\
good traction.
You can’t accelerate as quickly, turning is more difficult, and \
you’ll need
longer braking distances.
It’s best to use a low gear when you’re in mud-the deeper the \
mud, the
lower the gear. In really deep mud, the idea is
to keep your vehicle moving
so you don’t get stuck.
When you drive on sand, you’ll sense a change in wheel tra\
ction. But
it will
depend upon how loosely packed the sand is. On loosely packed \
sand (as
on beaches or sand dunes) your tires will tend to sink into the\
sand. This
has an effect on steering, accelerating, and braking. You may want to reduce
the air pressure
in your tires slightly when driving on sand. This will improve
traction.
Hard packed snow and ice offer the worst tire traction. On these surfaces, it’s
very easy to lose control. On wet ice, for example, the tract\
ion is
so poor
that you will have difficulty accelerating. And
if you do get moving, poor
steering and difficult braking can cause you to slide out
of control.
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