brakes SMART FORTWO COUPE 2008 User Guide

Tires and wheels
204
>> Operation Tire ply material
1
Plies in sidewall
2
Plies under tread
i
For illustration purposes only. Actual data
on tires are specific to each vehicle and may
vary from data shown in above illustration.
This marking tells you about the type of cord
and number of plies in the sidewall and under
the tread.
Tire and loading terminologyAccessory weight
The combined weight (in excess of those stan

dard items which may be replaced) of auto

matic transmission, power steering, power
brakes, power windows, power seats, radio,
and heater, to the extent that these items are
available as factory
installed equipment
(whether installed or not).
Air pressure
The amount of air inside the tire pressing
outward on each square inch of the tire.
Air pressure is expressed in pounds per
square inch (psi), or kilopascal (kPa) or bars.
Aspect ratio
Dimensional relationship between tire section
height and section width expressed in per

centage.Bar
Another metric unit for air pressure. There
are 14.5038 pounds per square inch (psi)
to 1 bar; there are 100 kilopascals (kPa)
to 1 bar.
Bead
The tire bead contains steel wires wrapped by
steel cords that hold the tire onto the rim.
Cold tire inflation pressure
Tire inflation pressure when your vehicle has
been sitting for at least 3 hours or driven no
more than 1 mile (1.6 km).
Curb weight
The weight of a motor vehicle with standard
equipment including the maximum capacity of
fuel, oil, and coolant, and, if so equipped, air
conditioning and additional optional equip

ment, but without passengers and cargo.

Tires and wheels
>> Operation
205
DOT (D
epartment o
f T
ransportation)
A tire branding symbol which denotes the tire
meets requirements of the U.S. Department of
Transportation
GAWR (G
ross A
xle W
eight R
ating)
The GAWR is the maximum permissible axle
weight. The gross vehicle weight on each axle
must never exceed the GAWR for the front and
rear axle indicated on the certification label
located on the driver’s door B
pillar.
GVW (G
ross V
ehicle W
eight)
The GVW comprises the weight of the vehicle
including fuel, tools, installed accessories,
passengers and cargo. The GVW must never
exceed the GVWR indicated on the certifi

cation label located on the driver’s door
B
pillar.GVWR (G
ross V
ehicle W
eight R
ating)
This is the maximum permissible vehicle
weight of the fully loaded vehicle (weight of
the vehicle including all options, passengers,
fuel, and cargo. It is indicated on certification
label located on the driver’s door B
pillar.
Kilopascal (kPa)
The metric unit for air pressure. There are
6.9 kPa to 1 psi; another metric unit for air
pressure is bars. There are 100 kilopascals
(kPa) to 1 bar.
Maximum load rating
The maximum load in kilograms and pounds
that can be carried by the tire.
Maximum loaded vehicle weight
The sum of curb weight, accessory weight,
total load limit and production options weight.Maximum permissible tire inflation pressure
This number is the greatest amount of air
pressure that should ever be put in the tire.
Normal occupant weight
The number of occupants the vehicle is
designed to seat, multiplied by 68 kilograms
(150 lbs).
Occupant distribution
The distribution of occupants in a vehicle at
their designated seating positions.
Production options weight
The combined weight of those installed regu

lar production options weighing over 5 lbs
(2.3 kilograms) in excess of those standard
items which they replace, not previously con

sidered in curb weight or accessory weight,
including heavy duty brakes, ride levelers,
roof rack, heavy duty battery, and special
trim.

Driving instructions
212
>> Operation
BrakesRefer to the description of the hydraulic
brake assistant (

page 75).
!
Because the ESP
® operates automatically,
the engine must be shut off (key in starter
switch position0) when
• the parking brake is being tested on a
brake test dynamometer
• the vehicle is being towed with the front
axle raised
Active braking action through the
ESP
® may
otherwise seriously damage the brake system
which is not covered by the smart Limited
Warranty.Brake pad wear or a leak in the brake system
may be the reason for low brake fluid level in
the brake fluid reservoir.
The brake fluid level in the brake fluid
reservoir may be too low if the brake warning
lamp in the instrument cluster comes on
(

page 34) although the parking brake is
released.
Have the brake system inspected immediately.
Contact an authorized smart center.
All checks and service work on the brake
system should be carried out by qualified
technicians only. Contact an authorized smart
center.
Only install brake pads and use brake fluid
recommended by smart.Inclines
!
When driving down long and steep grades,
relieve the load on the brakes by shifting into
a lower gear to use the engine’s braking
power. This helps prevent overheating of the
brakes and reduces brake pad wear.
When using the engine’s braking power, a
drive wheel may not spin for an extended pe

riod of time, e.g. on slippery road surfaces.
This may cause serious damage to the drive

train which is not covered by the smart
Limited Warranty.
G
Warning!
Make sure not to endanger any other
road users when carrying out braking
maneuvers.

Driving instructions
>> Operation
213
High and low stresses
After hard braking, it is advisable to drive on
for some time, rather than immediately park,
so that the air stream will cool down the
brakes faster.
If your brake system is normally only
subjected to moderate loads, you should
occasionally test the effectiveness of the
brakes by applying above
normal braking
pressure at higher speeds. This will also
enhance the grip of the brake pads.Wet road surfaceTo help prevent brake disk corrosion after
driving on wet road surfaces (particularly
salted roads), it is advisable to brake the
vehicle with considerable force prior to park

ing. The heat generated serves to dry the
brakes.
Limited braking effect on salted roads
Remember that the effect of the brakes can be
limited on salted road surfaces. A layer of salt
can form on brake disks and brake pads, con

siderably reducing the friction between the
brake disk and the brake pad. The effect is
most noticeable after long trips without brak

ing, e.g. on the highway, and after the vehicle
has been parked for several hours.G
Warning!
Resting your foot on the brake pedal will
cause excessive and premature wear of
the brake pads.
It can also result in the brakes overheat

ing, thereby significantly reducing their
effectiveness and your ability to stop the
vehicle in sufficient time to avoid an ac

cident.
G
Warning!
Make sure not to endanger any other
road users when carrying out these
braking maneuvers.G
Warning!
After driving in heavy rain for some time
without applying the brakes or through
water deep enough to wet brake compo

nents, the first braking action may be
somewhat reduced and increased pedal
pressure may be necessary to obtain
expected braking effect. Maintain a safe
distance from vehicles in front.
G
Warning!
Make sure not to endanger any other
road users when carrying out these
braking maneuvers.

Driving instructions
>> Operation
217
For more information, see "Tires and wheels"
(
page 182).
HydroplaningDepending on the depth of the water layer on
the road, hydroplaning may occur resulting in
a loss of control, even at low speeds and with
new tires. Reduce vehicle speed, avoid track
grooves in the road and apply brakes cau

tiously when it is raining.
Tire tractionThe safe speed on a wet, snow covered or icy
road is always lower than on a dry road.
You should pay particular attention to the
condition of the road whenever the outside
temperatures are close to the freezing point.smart recommends winter tires
(
page 208)

with a minimum tread depth of approximately 1/6in (4 mm) on all four wheels for the winter
season to ensure normal balanced handling
characteristics. On packed snow, they can
reduce your stopping distance compared to
summer tires.
Stopping distance, however, is still consider

ably greater than when the road is not cov

ered with snow or ice. Exercise appropriate
caution.
!
Avoid spinning of a drive wheel for an ex

tended period when driving off on slippery
road surfaces. Otherwise, the the drivetrain
c o u l d b e d a m a g e d , w h i c h i s n o t co v e r e d b y t h e
smart Limited Warranty.
G
Warning!
Do not drive with a flat tire. A flat tire will
affect your ability to steer or brake and
may cause you to lose control of the vehi

cle. Continued driving with a flat tire or
driving at high speed with a flat tire will
cause excessive heat build
up and possi

bly a fire.
G
Warning!
If ice has formed on the road, tire trac

tion will be substantially reduced. Under
such weather conditions, drive, steer and
brake with extreme caution.

Vehicle care
226
>> Operation
Vehicle careContact an authorized smart center for rec

ommended and approved care products.i
Advice on caring for the soft top system,
see (
page 230).
!
To avoid damage to interior equipment and materials: Never rub roughly or use cleaning spirits on the cloth upholstery, never use strong
agents, stain remover etc. on the leather upholstery. Never scour ore use solvent on plastic parts. Never use strong and aggressive agents on
windows, do not touch the inside of the windows with hard objects such as an ice scraper or ring, doing so may damage the windows.
G
Warning!
After washing the vehicle, the brakes may
still be wet and thus their functionality
impaired. Therefore, when you start off,
brake lightly several times without en

dangering traffic.
Interior
Special considerations
Light soiling
Heavy soiling
Cloth upholstery
Use a clean, lint
free cloth
Light soap suds
Stain remover (test on an incon

spicuous place first)
Plastic parts
Use a color
fast cloth
Damp, clean cloth, cockpit spray
Damp, clean cloth, cockpit spray
Leather upholstery
Use a clean, color
fast cloth
Clean cloth with lukewarm water,
leather care product
Leather care product
Windows
Damp, clean cloth, microfiber
cloth, glass cleaner
Microfiber cloth, glass cleaner