1996 GMC SAVANA brake

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.
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. That 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 reuction tirne.
Average wcrc'tion 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 three seconds or more
with another. Age, physical condition, alertness,
coordination and eyesight all play a part.
So do alcohol,
drugs and frustration.
But even in 3/4 of a second, a
vehicle moving at
60 mph (100 km/h) 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.
4-5
ProCarManuals.com

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 Brakes
Your vehicle has anti-lock brakes (ABS). ABS is an
advanced electronic braking system that
will help
prevent
a braking skid.
When you start
your engine and 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. This is normal.
ANTI -
LOCK
If there’s a problem with
the anti-lock brake system,
this warning light will stay
on. See ”Anti-Lock Brake
System Warning Light’’
in
the Index.
ProCarManuals.com

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 and let anti-lock work for you. You may feel the
brakes vibrate,
or you may notice some noise. but this
is normal.
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, steering can help you more
than even the very best braking.
Stc . ring
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.
4-8
ProCarManuals.com

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
acceleration
-- have to do their work where the tires meet
the road. Adding the sudden acceleration can demand too
much
of those places. You can lose control.
What should you do
if this ever happens? Ease up on the
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.
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
in
Emergencies” earlier in this section.) 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.
4-9
ProCarManuals.com

0 Check your mirrors, glance over your shoulder and
start your
left lane change signal before moving out
of the right lane to pass. When you are far enough
ahead
of the passed vehicle to see its front in your
inside mirror, activate your right lane change signal
and move back into the right lane. (Remember that
your right outside mirror is convex. The vehicle you
just passed may seem to be farther away from
you
than it really is.)
0 Try not to pass more than one vehicle at a time
on two-lane roads. Reconsider before passing the
next vehicle.
0 Don’t overtake a slowly moving vehicle too rapidly.
Even though the brake lamps are
not flashing, it
may be slowing down or starting to turn.
0 If you’re being passed, make it easy for the
following driver to get ahead
of you. Perhaps you
can ease a
little to the right.
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 and an acceleration skid are best
handled
by easing your foot oft’ the accelerator pedal.
4-12
ProCarManuals.com

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 surfxe 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 surfdce” -- and
slow down when you have any doubt.
Remember: Any anti-lock brake system
(ABS) helps
avoid only the braking skid.
Driving at Night
Night driving is more dangerous than day driving,
One reason
is that so111e drivers are likely to be
impaired
-- by alcohol or drugs, with night vision
problems,
or by fatigue.
4-13
ProCarManuals.com

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
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.
4-16
ProCarManuals.com

0
0
Keep your vehicle in good shape. Check all fluid
levels and also the brakes, tires, cooling system and
transmission. 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 long hill.
A CAUTION:
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. Coasting
downhill in
NEUTRAL (N) 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
0
0
0
Know how tb go uphill. You may want to shift down
to a lower gear. The lower gears help cool your engine
and transmission, and you can climb the
hill better.
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
YOLI stay in your own lane.
As you go over the top of a hill, be alert. There could 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 ale1-f to these and take appropriate action.
4-22
ProCarManuals.com