The anti-lock system can change the brake pressure
faster than any driver could. The computer is
programmed to make the most of available tire and road
conditions. This can help you steer around the obstacle
while braking hard.
As you brake, your computer keeps receiving updates
on wheel speed and controls braking pressure
accordingly.Remember: Anti-lock does not change the time you
need to get your foot up to the brake pedal or always
decrease stopping distance. If you get too close to
the vehicle in front of you, you will not have time to apply
your brakes if that vehicle suddenly slows or stops.
Always leave enough room up ahead to stop, even
though you have anti-lock brakes.
Using Anti-Lock
Do not pump the brakes. Just hold the brake pedal
down rmly and let anti-lock work for you. You may feel
a slight brake pedal pulsation or notice some noise,
but this is normal.
Braking in Emergencies
At some time, nearly every driver gets into a situation
that requires hard braking.
If you have anti-lock brakes, you can steer and brake at
the same time. However, if you do not have anti-lock
brakes, your rst reaction — to hit the brake pedal hard
and hold it down — may be the wrong thing to do.
Your wheels can stop rolling. Once they do, the vehicle
cannot 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.
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If you do not have anti-lock brakes, use a “squeeze”
braking technique. This will give you maximum braking
while maintaining steering control. You can do this
by pushing on the brake pedal with steadily
increasing pressure.
In an emergency, you will probably want to squeeze the
brakes hard without locking the wheels. If you hear or
feel the wheels sliding, ease off the brake pedal.
This will help you retain steering control. If you do have
anti-lock brakes, it is different. SeeAnti-Lock Brake
System (ABS) on page 4-7.
In many emergencies, steering can help you more than
even the very best braking.
Traction Control System (TCS)
If the vehicle has the 3800 Supercharged V6 engine
or the 5.3L V8 engine, it has a Traction Control
System (TCS) that limits wheel spin. This is especially
useful in slippery road conditions. The system operates
only if it senses that one or both of the front wheels are
spinning or beginning to lose traction. When this
happens, the system works the front brakes and
reduces engine power to limit wheel spin.This symbol, along with the
TRACTION CONTROL
ACTIVE message, comes
on the DIC screen when
the system is active.
You may feel or hear the system working, but this
is normal.
When the traction control system is not working, one of
these symbols will come on the instrument panel cluster.
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To limit wheel spin, especially in slippery road
conditions, the ETS should always be left on. But the
system can be turned off. The system should be turned
off if the vehicle ever gets stuck in sand, mud, or
snow and rocking the vehicle is required. SeeRocking
Your Vehicle to Get It Out on page 4-33andIf Your
Vehicle is Stuck in Sand, Mud, Ice or Snow on
page 4-32for more information.
Press the traction control
button located on the
console to turn the
system off.
If the system is limiting wheel spin when the button is
pressed, the system will turn off instantly. Press the
traction control button again to turn the system on.StabiliTrak®Plus System
The vehicle may have a vehicle stability enhancement
system called StabiliTrak®Plus. It is an advanced
computer controlled system that assists with directional
control of the vehicle in difficult driving conditions.
StabiliTrak
®Plus comes on whenever the vehicle is
started. It activates when the computer senses a
discrepancy between the intended path and the direction
the vehicle is actually traveling. StabiliTrak
®Plus
selectively applies braking pressure at any one of the
vehicle’s brakes to help control the vehicle in the
steering direction.
This symbol, along with
the STABILITY CONTROL
ACTIVE message comes
on the Driver Information
Center (DIC).
SeeDIC Warnings and Messages on page 3-72. You
may also hear a noise or feel vibration in the brake
pedal. This is normal. Continue to steer the vehicle in
the desired direction.
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If there is a problem
detected with StabiliTrak®
Plus, this symbol along
with the SERVICE
STABILITY SYSTEM
warning message
will come on the DIC.
SeeDIC Warnings and Messages on page 3-72. When
this message is displayed, the system is not operational.
Driving should be adjusted accordingly.
To turn the StabiliTrak
®system off (GXP only), press
and hold the traction control button for more than
ve seconds. A message will appear on the DIC
indicating that StabiliTrak
®has been turned off. You can
turn the system back on at any time by pressing the
button again.
If the vehicle is in cruise control when StabiliTrak
®Plus
activates, the cruise control will automatically
disengage. When road conditions allow safe use of it,
the cruise control can be used again. SeeCruise Control
on page 3-11for more information.
Steering
Power Steering
If you lose power steering assist because the engine
stops or the system is not functioning, you can steer but
it will take much more effort.
Variable Effort Steering
If your vehicle has this steering system, the system
provides less steering effort for parking and when driving
at speeds below 20 mph (32 km/h). Steering effort will
increase at higher speeds for improved road feel.
Steering Tips
It is important to take curves at a reasonable speed.
A lot of the “driver lost control” accidents mentioned on
the news happen on curves. Here is 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 is no traction, inertia
will keep the vehicle going in the same direction. If
you have ever tried to steer a vehicle on wet ice, you
will 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 are in a curve, speed is the one factor you
can control.
Suppose you are steering through a sharp curve.
Then you suddenly apply the brakes. Both control
systems — steering and braking — have to do their
work where the tires meet the road. Unless you
have four-wheel anti-lock brakes, adding the hard
braking can demand too much of those places. You
can lose control.
The same thing can happen if you are 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. SeeTraction Control
System (TCS) on page 4-9orEnhanced Traction
System (ETS) on page 4-11.What should you do if this ever happens? Ease 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 will 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.
Adding non-GM accessories can affect your vehicle’s
performance. SeeAccessories and Modi cations
on page 5-3.
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