brakes OLDSMOBILE SILHOUETTE 2003 User Guide

Avoid needless heavy braking. Some people drive
in spurts
- heavy acceleration followed by heavy
braking
- rather than keeping pace with traffic. This is
a mistake. Your brakes may not have time to cool
between hard stops. Your brakes will wear out much
faster
if you do a lot of heavy braking. If you keep pace
with the traffic and allow realistic following distances,
you will eliminate a lot of unnecessary braking.
That means better braking and longer brake life.
If your engine ever stops while you’re driving, brake
normally but don’t pump your brakes.
If you do,
the pedal may get harder to push down.
If your engine
stops, you will still have some power brake assist.
But you will use
it when you brake. Once the power
assist is used up, it may take longer to stop and
the brake pedal will be harder to push.
Anti-lock Brake System (ABS)
Your vehicle may have anti-lock brakes. ABS is an
advanced electronic braking system that will help prevent a braking skid.
If your vehicle has anti-lock
brakes, this warning light
on the instrument panel will
come on briefly when
you start your vehicle.
When you start your engine, or when you begin to
drive away, your anti-lock brake system will check
itself. You may hear a momentary motor or clicking
noise while this test is going on, and you may even
notice that your brake pedal moves or pulses a little.
This is normal.
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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.
Let’s say the road is wet and you’re driving safely.
Suddenly, an animal jumps out in front
of you. You slam
on the brakes and continue braking. Here’s what
happens with
ABS:
A computer senses that wheels are slowing down.
If one
of the wheels is about to stop rolling, the computer
will separately work the brakes at each wheel. As you brake, your computer keeps receiving updates
on wheel speed and controls braking pressure
accordingly.
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Remember: Anti-lock doesn’t 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 won’t 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
Don’t pump the brakes. Just hold the brake pedal down
firmly 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, you can steer and brake at the
same time. However,
if you don’t have anti-lock,
your first reaction
- to hit the brake pedal hard
and hold it down
- mav be the wronq thina to do. Your
wheels can stop rolling. 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.
If you don’t have anti-lock, 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, it’s different. See “Anti-Lock Brakes.”
In many emergencies, steering can help you more than
even the very best braking.
4-9

Traction Control System (TCS)
Your vehicle may have a traction control system 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.
The TRACTION ACTIVE message will come on when
the traction control system is limiting wheel spin.
See
Traction Active Message on page 3-53. You may
feel or hear the system working, but this is normal.
If your vehicle is in cruise control when the traction
control system begins to limit wheel spin, the cruise
control will automatically disengage. When road
conditions allow you to safely use it again, you may
reengage the cruise control. See “Cruise Control’’ under
Turn SignaVMultifunction Lever on page 3-7.
SERVICE
TRACTION
SYSTEM
United States
Canada
If this message comes on and stays on or comes on
while you are driving, there’s
a problem with your
traction control system.
See
Service Traction System Warning Message on
page
3-52. When this warning message is on, the TRAC
OFF light will come on to remind you that the system
will not limit wheel spin. Adjust your driving accordingly.
The traction control system automatically comes on
whenever you start your vehicle.
To limit wheel spin,
especially in slippery road conditions, you should always
leave the system on. But you can turn the traction control
system
off if you ever need to. You should turn the
system
off if your vehicle ever gets stuck in sand, mud or
snow and rocking the vehicle is required. See “Rocking
Your Vehicle” under
If You Are Stuck: In Sand, Mud, Ice
or Snow on page
4-30.
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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.
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 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 accelerate. 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’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. See
Traction Control
System (TCS) on page
4- 10.
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’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.
4-1 2

Steering in Emergencies
There are times when steering can be more effective
than braking. 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 problem.
Your vehicle can perform very well in emergencies
like these. First apply your brakes.
See
Braking on page 4-6. 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 wheel once you have
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The fact that such emergency situations are always
possible is a good reason to practice defensive driving
at all times and wear safety belts properly.
4-1 3

Loss of Control
Let’s review what driving experts say about what happens
when the three control systems (brakes, steering and
acceleration) don’t have 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 drivers avoid most skids by taking reasonable
care suited to existing conditions, and by not “overdriving”
those conditions. But skids are always possible.
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 is best handled by easing your foot
off
the accelerator pedal.
If you have the Traction Control System, remember:
It helps avoid only the acceleration skid.
If you do not
have this system, or
if the system is off, then an
acceleration skid is also best handled by easing your
foot
off the accelerator pedal.
If your vehicle starts to slide, ease your foot off the
accelerator pedal and quickly steer the way you want
the vehicle to go. If you start steering quickly enough,
your vehicle may straighten out. Always be ready
for a second skid
if it occurs.
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.
If you have the anti-lock braking system, remember:
It helps avoid only the braking skid.
if you do not have
anti-lock, then in a braking skid (where the wheels
are no longer rolling), release enough pressure on the
brakes to get the wheels rolling again. This restores
steering control. Push the brake pedal down steadily
when you have to stop suddenly.
As long as the wheels
are rolling, you will have steering control.
4-1 6

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.
It’s wise to keep your wiping equipment in good shape
and keep your windshield washer tank filled with washer
fluid. 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.
Wet brakes can cause accidents. They won’t
work as 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.
4-1 9

If you drive regularly in steep country, or if you’re
planning to visit there, here are some tips that can make
your trips safer and more enjoyable.
Keep your vehicle in good shape. Check all fluid
levels and also the brakes, tires, cooling system
and transaxle. These parts can work hard on
mountain roads.
Know how to go down hills. The most important
thing to know is this: let your engine do some
of
the slowing down. Shift to a lower gear when you go
down a steep or Ion-
511.
If you don’t shift down, your brakes could get
so hot that they wouldn’t work well. You would
then have poor braking or even none going
down
a hill. You could crash. Shift down to let
your engine assist your brakes on
a steep
downhill slope. Coast
...d downhill in NEUTRA- ,.., or with the
ignition
off is dangerous. Your brakes will have
to do
all the work of slowing down. They could
get
so hot that they wouldn’t work well. You
would then have poor braking or even none going down
a hill. You could crash. Always
have your engine running and your vehicle in
gear when you go downhill.
0 Know how to go uphill. You may want to shift down to
a lower gear. The lower gears help cool your engine
and transaxle, and you can climb the hill better.
e Stay in your own lane when driving on two-lane
roads in hills or mountains. Don’t swing wide or cut
across the center of the road. Drive at speeds that let
you stay in your own lane.
- As you go over ihe iop oi a hiii, be aieri. There couia
be something in your lane, like a stalled car or an
accident.
You may see highway signs on mountains that warn
of special problems. Examples are long grades,
passing
or no-passing zones, a falling rocks area or
winding roads. Be alert to these and take appropriate
action.
4-25

What’s the worst time for this? “Wet ice.” Very cold
snow or ice can be slick and hard to drive on. But wet
ice can be even more trouble because it may offer
about freezing
(32°F; OOC) and freezing rain begins
to fall. Try to avoid driving on wet ice until salt and sand
crews can get there.
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Whatever the condition - smooth ice, packed, blowing
or loose snow
- drive with caution.
If you have traction control, keep the system on.
It will
improve your ability to accelerate when driving on a
slippery road. But you can turn the traction system
off
if you ever need to. You should turn the system off
if your vehicle ever gets stuck in sand, mud, ice,
or snow. See If You Are Stuck: In Sand, Mud, Ice or
Snow on page
4-30. Even though your vehicle has
a traction system you’ll want to slow down and adjust
your driving to the road conditions. See
Traction Control
System (TCS) on page
4- 10.
If you don’t have a traction system, accelerate gently.
Try not to break the gentle traction. If you accelerate
too fast, the drive wheels will spin and polish the surface
under the tires even more.
Unless you have the anti-lock braking system, you’ll
want to brake very gently, too. (If you do have anti-lock,
see
Braking on page 4-6. This system improves your
vehicle’s stability when you make a hard stop on a
slipperv road.) Whether you have
the anti-lock braking
system or not, you’ll want to begin stopping sooner than
you would on dry pavement. Without anti-lock brakes,
if you feel your vehicle begin to slide, let up on the
brakes a little. Push the brake pedal down steadily
to
get the most traction you can.
4-27