1993 CHEVROLET TRACKER traction control

Your Driving and the Road
II. 132
Braking in Emergencies
At some time, nearly every driver gets
into a situation that requires hard
braking.
You have the rear wheel
anti-lock braking system. Your front
wheels can stop rolling when you brake
very hard. Once they do, the vehicle
can’t respond to your steering.
Momentum will carry it in whatever
direction it was headed when
the wheels
stopped rolling. That could be off the
road, into the very thing you
were
trying to avoid, or into traffic.
So, use a “squeeze” braking technique.
This
will give you maximum braking
while maintaining steering control. You
do this by pushing on the brake pedal
with steadily increasing pressure. When
you do, you can maintain steering
control. In many emergencies, steering
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 news 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
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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.
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 apply the
brakes. Both control systems
- steering
i and braking - have to do their work where the tires
meet the road. Adding
the hard braking can demand too much
at those places.
You can lose control.
The same thing can happen if you’re
steering through a sharp curve and you
suddenly accelerate. Those two control
systems
- steering and acceleration -
can 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 brake or
accelerator pedal, 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.
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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
limited. 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 to 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: the
rear wheel anti-lock
braking system (RWAL) helps avoid
only a rear braking skid. In a braking
skid (where the front wheels are no
longer rolling), release enough pressure
on the brakes to get the front wheels
rolling again. This restores steering
control. Push the brake pedal down
steadily when you have to stop
suddenly. As long as the front wheels
are rolling, you will have steering
control. Steer the way you want to go.
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Your Driving and the Road
... 144
Scanning the Terrain
Off-road driving can take you over
many different kinds of terrain. You
need to be familiar with the terrain and
its many different features. Here
are
some things to consider.
Surface Conditions. Off-roading can
take you over hard-packed dirt; gravel,
rocks, grass, sand, mud, snow or ice.
Each
of these surfaces affects the
steering, acceleration, and braking of
your vehicle in different ways.
Depending upon the kind of surface you
are
on, you may experience slipping,
sliding,
wheel spinning, delayed
acceleration, poor traction. and longer
braking distanc
Surface Obstacles. Unseen or hidden
obstacles can be hazardous.
A rock, log,
hole, rut, or bump can startle
you if
you’re not prepared for them. Often
these obstacles
are hidden by grass,
bushes, snow or even the rise and fall of
the terrain itself. Here are some things
to consider:
Is the path ahead clear?
Will the surface texture change
Does the travel take you uphill or
abruptly up ahead?
downhill? (There’s
more discussion of
these subjects later.)
change direction quickly?
Will you have to stop suddenly or When you
drive over obstacles or rough
terrain, keep
a firm grip on the steering
wheel. Ruts, troughs, or other surface
features can jerk the wheel out of your
hands if you’re not prepared.
When you drive over bumps, rocks, or
other obstacles,
your wheels can leave
the ground.
If this happens, even with
one or two wheels, you can’t control the
vehicle as well or at
all.
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Your Driving and the load
1 CAUTION
1 Many hills are simply too I
- steep for any vehicle. If you
drive up them,
you will stall. If
you drive down them, you can’t
control your speed. If you drive
across them, you will
roll over.
You could be seriously injured or
killed. If you have any doubt about
the steepness, don’t drive the hill.
Approaching a Hill
When you approach a hill, you need to
decide if it’s one of those hills that’s just
too steep to climb, descend,
or cross.
Steepness can be hard
to judge. On a
very small hill,
for example, there may
be a smooth, constant incline with only
a small change in elevation where you
can easily see all the way to the top. On
a large hill, the incline may get steeper
as
you near the top, but you may not see
this because the crest of the hill is
hidden by bushes,
grass, or shrubs.
Here are some other things to consider
as you approch a hill.
Is there a constant incline, or does the
hill get sharply steeper
in places?
Is there good traction on the hillside,
or will the surface cause tire slipping?
Is there a straight path up or down the
hill
so you won’t have to make
turning maneuvers?
Are there obstructions on the hill that
can block your path (boulders, trees,
logs
or ruts)?
What’s beyond the hill? Is there a
cliff, an embankment, a drop-off, a
fence? Get out and walk the hill if
you don’t know. It’s the smart way to
find out.
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..
I
CA UTlON
t
Getting out on the downhill
(low) side of a vehicle
stopped across 811 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.
I
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 traction. 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 traction 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.
I
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Your Driving and the Road
I
*. ’ i
... 160
Driving in the Rain
Rain and wet roads can mean driving
trouble. On
a wet road you can’t stop,
accelerate or turn as well because your
tire-to-road traction isn’t as good as on
dry roads. And,
if your tires don’t have
much tread
left, you’ll get even less
traction.
It’s always wise to go slower and be
cautious
if rain starts to fall while you
are driving. The surface may get wet
suddenly when your reflexes are tuned
for driving on dry pavement.
The heavier the rain, the harder
it is to
see. Even if your windshield wiper
blades are
in good shape, a heavy rain
can make it harder to see road signs and traffic signals,
pavement markings, the
edge of the road, and even people
walking. Road spray can often be worse
for vision than rain, especially if
it
comes from a dirty road.
So it is wise to keep your wiping
equipment
in good shape and keep your
windshield washer tank filled. Replace
your windshield wiper inserts when they
show signs of streaking or missing areas
on the windshield, or when strips of
rubber start to separate from the inserts. Driving too
fast through large water
puddles or
even going through some car
washes can cause problems, too. The
water may affect your brakes. Try to
avoid puddles. But if you can’t, try to
slow down before
you hit them.
I A Wet brakes can cause
- accidents. They won’t work
well
in a quick stop and may cause
pulling to one side.
You could lose
control of the vehicle.
After driving through a large
puddle of water or a car wash,
apply your brake pedal lightly until
your brakes work normally.
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The tire has a bump, bulge or split.
The tire has a puncture, cut, or other
damage that can’t be repaired well
because of the size or location of the
damage.
Buying New Tires
To find out what kind and size of tires
you need, look at the Tire-Loading
Information label. The tires installed
on
your vehicle when it was new had a Tire
Performance Criteria Specification (TPC
Spec) number on each tire’s sidewall.
When you get new tires, get ones with that same TPC
Spec number. That way,
your vehicle will continue to have tires
that are designed to give proper
endurance, handling, speed rating,
traction, ride and other things during
normal service on your vehicle. If your
tires have
an all-season tread design, the
TPC number will be followed by a
“MS” (for mud and snow).
If you ever replace your tires with those
not having a TPC Spec number, make
sure they are the same size, load range,
speed rating and construction type (bias,
bias-belted
or radial) as your original
tires.
Mixing tires could cause you
- to lose control while driving.
I€ you mix tires of different sizes
or types (radial and bias-belted
tires), the vehicle may not handle
properly, and you could have a
crash. Be sure to use the same size
and type tires on all four wheels.
Uniform Tire Quality Grading
The following information relates to the
system developed by the United States
National Highway Traffic Safety
Administration which grades tires by
treadwear, traction and temperature
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