$RAKING
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 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.
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.
172
r_ ,
-1
Anti-Lock Brakes (ABS)
Your Cadillac has an advanced electronic braking system that will help
prevent skidding.
This light on the
instrument panel will
go on when you start
your vehicle.
When you start your vehicle and begin to drive away, you may hear a
momentary motor or clicking noise. And you may even notice that your
brake pedal moves a little while this
is going on. This is the ABS system
testing itself.
If there’s a problem with the anti-lock brake system, the
anti-lock brake system warning light will stay on.
See “Anti-lock Brake System Warning Light’’ in the Index.
Here’s how anti-lock works. Let’s say the road is wet. You’re driving
safely. Suddenly an animal jumps out in front
of you.
173
You slam on the brakes. 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 front wheel and at the rear wheels.
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.
You can 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 doesn't change the time you need to get your foot
up to the brake pedal. 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.
To Use Anti-Lock
Don't pump the brakes. Just hold the brake pedal down and let anti-lock
work for
you. You may hear the anti-lock pump or motor operate, and
feel the brake pedal pulsate, but this
is normal.
174
i
n!
Traction Control System
This feature is deleted on Coach Builder limousines and funeral coach
packages.
Your vehicle has a traction control system that limits wheel spin. This is
especially useful in slippery road conditions.
The system operates only if
it senses that the rear wheels are spinning or beginning to lose traction.
When this happens, the system works the rear brakes and reduces engine
power (by closing the throttle) to limit wheel spin.
The ‘TRACTION ENGAGED’’ light will come on when the traction
control system is limiting wheel spin. See “Traction Control System Active
Light” in the Index. You may feel the system working, or you may notice
some noise, 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 re-engage the
cruise control,. (See “Cruise Control” in the Index.)
175
.
n The TRACTION CONTROL
DISABLE SWITCH
is located
in the glove
compartment.
I
To turn the system off, press and hold the button until the “TRACTION
CONTROC’ light comes
on and stays on. To turn the system back on, you
must stop and turn off the ignition. Then restart the engine.
Brake Wear
Your Cadillac has front disc brakes and rear drum brakes.
Disc brake pads have built-in wear indicators that make a high-pitched
warning sound when the brake pads are worn and new pads are needed.
The
sound may come and go or be heard all the time your vehicle is
moving (except when you are pushing on the brake pedal firmly).
177
I
I NOTICE:
Continuing to drive with worn-out brake pads coula result in
I
costly brake repair.
Some driving conditions or climates may cause a brake squeal when the
brakes are first applied or lightly applied. This does not mean something
is wrong with your brakes.
Your rear drum brakes don't have wear indicators, but if you ever hear a
rear brake rubbing noise, have the rear brake linings inspected.
Also, the
rear brake drums should be removed and inspected each time the tires
are removed for rotation or changing. When you have the front brakes
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.
I
I
Brake Adjustment
Every time you make a moderate brake stop, your disc brakes adjust for
wear.
If you rarely make a moderate or heavier stop, then your brakes
might not adjust correctly.
If you drive in that way, then -- very carefully --
make a few moderate brake stops about every 1000 miles (1600 km), so
your brakes will adjust properly.
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
brakes may need adjustment. Adjust them by backing up and firmly
applying the brakes a
few times.
ni
system is on, 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 Cadillac 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 wheel once you have avoided the object.
180
i 7‘
L
1
n
1
Lil
c3
I
I
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 Cadillac’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.
Remember: Any traction control system helps avoid only the acceleration
skid.
If your traction control 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
184
tl
a, i‘
c4’ I,
0 !
t