wheel AUDI S8 2008 Workshop Manual

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Speed
The higher the speed, the more difficu lt it becomes for the driver to
control the rig. Do not drive at the maximum permissible speed. Reduce your speed even more if load, weather or wind conditions
are unfavorable
-particularly when going downhi ll.
Reduce vehicle speed
i mm edia te ly if the trailer shows the slightest
sign of swaying.
Do not try t o stop the sway ing by accelerating.
Observe speed lim its. In some areas, speeds for vehicles towing
trai lers are lower than for regular ve hicles .
Always apply brakes ear ly. When driving down hill, shift into a lower
gear to use the engine braking effect to slow the vehicle. Use of the
brakes a lone can cause them to overheat and fail.
Cool ant temp era tu re
The coolant temperature gauge=> page 12 must be observed care­
ful ly. If the needle moves close to the upper end of the scale, reduce
speed immed iately and/or turn off the air conditioner.
If the coolant temperature warning light in the instrument cluster
starts flas hing
-F- , pul l off the road, stop and let t he engine idle for
about two m inutes to prevent heat build-up.
& WARNING
An yone n ot properl y re str aine d in a mo ving vehi cle is at a mu ch
g re ate r ri sk in an accid ent . N ever let any on e rid e in y our car who
i s not properl y wea rin g th e res tra int s pr ov ided by Audi.
•
Trailer towing tips
Important to know
Your vehicle handles differently when towing a trailer because of
the additional weight and different weight distribution. Safety, performance and economy wi
ll greatly depend on how carefully you
l oad your trailer and opera te your r ig.
Before you actual ly tow your trailer, practice turn ing, stopping and
backing up in an area away from traffic . Keep practicing unti l you
have become comp letely fam iliar with the way your vehicle-trai ler
combination behaves and responds.
Backing up is di fficult and requires practice. Backing up with a
trai ler generally requires steering action opposite to that when
backing up your veh ic le without a tra iler.
Ma inta in a greater distance between your veh ic le and the one in
front of you . You will need more room to stop. To compensate for
the trai ler, you w ill need a larger than norma l turning radius.
When passing, remember that you cannot accelerate as fast as you n or mally wou ld because of t he added load . Make su re you have
enough room to pass . After passing, al low plenty of room for your
t rai ler befo re changing lanes again .
Avo id jerky starts, sharp turns or rapid lane changes.
[ i ] T ips
• Do not tow a tra iler during the break-in period o f your veh ic le.
• I f you tow a trailer, your Audi may require more frequent main te­
nance due to t he extra
load=> page 380. •
Parking on a slope
Do n ot park on a slope with a trailer. If it cannot be
avoided, do
so o nly after doing the followi ng:
When p arking :
-Apply the foot b rake.
- Have someone p lace chocks under both the vehicle and
the trailer wheels. _,,,

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-Wit h chocks i n place, slowly release the brakes until the
wheel chocks absorb the load .
-Turn the wheels towards the curb.
-Apply the parking brake.
-Move the selector lever to P.
When rest arting after p arking :
-Apply the foot brake.
-Start the engine.
-Move the se lector lever to D.
-Re lease the parking brake and slowly pull out and away
f rom the whee l chocks .
-Stop and have someone retr ieve the wheel chocks .
[ i] Tip s
If you move the se lector lever of the automatic transmission to P
b efor e applying th e parking brak e and b efor e blocki ng th e wheels ,
you may have to use more force later to move the lever out of the
P
position .•
Controls and equip­ ment Safety first Vehicle operation
Vehicle care Do-it-yourself service Technical data

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Cleaning and protection
General information
Regular care preserves vehicle value.
Any automobile is exposed to industrial fumes, corrosive road salt,
muddy dog feet, etc . A well cared for Audi can look like new many
years a fter purchase. Regu lar a nd correc t ca re will contribu te to
maintaining the beauty and va lue of your Audi.
Furthermore, good care may be a condition for substantiating a
warr anty claim should corrosion d amage or paint defect s occur .
Your authorized Audi dealer has a variety of dedicated vehicle- care
product s
and can adv ise whic h ones to use fo r clea ning the exterior
and interior of your vehicle.
Whether you use prod ucts recom mended by Audi or o ther commer ­
cia lly availab le cleaning agents, please make sure you app ly them
correctly.
& WARNING
• Cleaning agents may be poi sonous . Keep them out of the reach
o f children .
• Heed all cau tion label s.
• Always read directions on the container before u sing any
p rodu ct. Follo w the di re ction s carefully .
• Most chemical cleaners are concentrated and have to be
diluted.
• Use spot removing fluids only in well ventilated area s.
• Do not use gasoline , kerosene , die sel fuel , n ail polish remo ver
or other vol atile fluids . They may be toxic , flammable or ha zardous
in other way s. Do n ot wash , w ax or dry the vehicle with the igni ­
tion on or the engine running.
& WARNING (continued )
• Do not clean the under sides of chassis , fenders , wheel cover s,
etc . without protecting your hands and arms. You may cut yourself
on sha rp -edged metal parts .
• Moisture and ice on brakes may impair braking effi ciency
=> page 270 , "Gener al info rm ation ". Test the brake s carefully each
time you wash the vehicle .
~ For the sake of the environment
Select only enviro nmen ta lly friend ly c leaning pr oducts . Leftover
clean ing products should not disposed of in the household waste. •
Care of exterior
Washing
Frequent washing protects the vehicle.
Th e best p rotection aga inst environmental influe nces is frequent
washing and waxing . How often this is required depends on:
• Ho w much the vehic le is used
• Where the vehic le is parked (garage, in the open under trees,
etc.)
• T he seasonal and weather conditions
• E nvironmenta l influences
T he longer bird droppings, insects, tree resin, road and industrial
gri me, ta r, soot, road salt and ot her mater ials rema in on the ve hicle
body, the more lasting their destruc tive effects will be . High temper­
atu res caused by exp osu re to in tense s un ligh t inte nsify the c orro -
s ive effect, particularly when hum idity is high as well .
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Under certain circumstances, weekly washing may be necessary.
Under other conditions, a monthly washing and waxing may be
adequate .
After the winter, the
underside of the vehicle should be thoroughly
washed, preferably in a professional car wash.
& WARNING
Always read and heed all WARNINGS and other information
=> page 288. •
Automatic car wash
The vehicle can be washed in almost any modern auto­
matic car wash.
The vehicle paint is so durable that the vehicle can normally be
washed without problems in an automatic car wash . However, the
effect on the paint depends to a large extent on the design of the
facility, the filtering of the wash water, the type of wash and care material, etc. If the paint has a dull appearance after going through
the car wash or is scratched, bring this to the attention of the oper­ ator immediately. If necessary, use a different car wash.
Before going through a car wash, be sure to take the usual precau­
tions such as closing the windows and power roof . Factory installed
antennas must not be removed.
If you have installed add itional accessories on the vehicle -such as
spoilers, roof rack, etc. -it is best to ask the car wash operator if
these should be removed .
& WARNING
Always read and heed all WARNINGS and other information
=> page 288. •
Washing the vehicle by hand
A lot of water is needed when washing a vehicle by hand.
-Before you start washing, make sure you have read and
understood the
WARNINGS=> & in "General informa­
tion" on
page 288.
-First soak all dried dirt until it is soft, then rinse it off.
-As you clean your vehicle, start with the roof and work
your way down to the bottom, using a sponge, a sponge glove or a clean brush.
-Rinse the sponge or the sponge glove often, flushing it
clean each time.
-Use special car shampoo only for very persistent dirt.
-Rinse the car thoroughly with water.
-Use a chamois leather to gently wipe the exterior dry.
Use a separate sponge for cleaning the wheels, door sills and other
regions exposed to road dirt. In this way, you will not scratch the
paint with coarse particles imbedded in the sponge the next time
you wash the car.
& WARNING
• Do not clean the underside of the chassis, fenders, wheel
covers, or other hard to reach parts without protecting your hands
and arms. You may cut yourself on sharp-edged metal parts.
• Always read and heed all WARNINGS and other information
=> page 288. ~
Vehicle care

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The best way to remove snow from windows and mirrors is to use a
brush. Use a non -abrasive
plastic ice scraper -better still, a spray
deicer -to remove
ice from windows and mirrors .
Oil, grease or silicone residue can be removed with
glass cleaner or
silicone remover . However, wax residue requires the use of a
specially formulated solvent. Please contact your Audi dealer for
advice on safe products for wax removal.
Windows should also be cleaned on the inside at regular intervals .
Never dry windows with the same chamois that you use to dry
painted surfaces . Wax residue on the chamois can impair vision
through the windows.
& WARNING
• Always read and heed all WARNINGS and other information
=> page 288 .
• The windshield must not be treated with water-repellent mate­
rials . They can increase glare under poor visibility conditions such
as wetness, darkness, or when the sun is low on the horizon. In
addition, they can cause the windshield wipers to chatter.
0 Note
• Never use warm or hot water to remove snow and ice from
windows and mirrors. This could cause the glass to crack.
• To prevent damage to the wires of the rear defogger, do not place
any adhesive stickers on the inside of the rear window over the
wires .
• To help prevent dirt from scratching the window, always scrape
in a forward direction -pushing the scraper away from you -never
back and forth. •
Weatherstrips
Complete car care includes the weatherstrips as well.
-Apply a suitable rubber conditioner to the weatherstrips
from time to time.
To be able seal properly, the weatherstrips around the hood, doors,
rear lid, etc . must remain pliable. Spray the weatherstrips with sili­
cone or coat them with talcum powder or glycerine to retain the
flexibility of the rubber and to protect them against freezing in the
winter.
& WARNING
Always read and heed all WARNINGS and other information
=> page 288.
[ i ] Tips
Keep silicone sprays off the windshield to avoid wiper smear in
rain. •
Cast (light) alloy wheels
Cast (light) alloy wheels require special care.
-Wash the wheels with a sponge or hose brush every
other week.
-For deep cleaning afterwards, use only a dedicated acid­
free cast alloy wheel cleaner.
-Rub a coat of liquid wax onto the rims every three month.
Be sure to reach and treat all parts of the rim.
To preserve the decorative appearance of the cast alloy wheels,
some special care is necessary . In addition to road dirt and salt,
Vehicle care

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brake dust is also corrosive. If left on for too long, brake dust can
cause pitting.
Use on ly specia l
acid-free cleaners formu lated for a lloy r ims . Safe
products are availab le at your Audi dealer. Never leave the cleaner
on the ri ms longer than specified on the label. If not rinsed off
promptly, the acid contained in some c leaners can attack the
threads o n the wheel bo lts .
Never use abrasive or metal po lishing c leaning agents . If the protec ­
t ive coating has been chipped, e.g . by kicked up road dirt, touch i t
up as soon as possible .
& WARNING
• Moisture and i ce on b rake s ma y affe ct b raking effi ciency
=> page 270 , "General information ". Te st the brakes carefully ea ch
t ime you wa sh the vehi cle .
• Alway s read and heed all WARNINGS and other information
=> page 288. •
Body cavity sealing
The body cavity sealing does not nee d to be checked.
A ll body cavit ies which could be affected by corrosion have been
t horough ly pr otected a t the factory .
This sealing does not require any inspection or additional treat ­
ment . If any wax should seep out of the cavity when the ambient
temperature is high, it can be removed with a plastic scraper and a suitable solvent .
& WARNING
Solvents can be d angerous.
• Ben zine is flammable and to xic . If you use benzine for removing
the wax , keep sparks, flame and lighted cigarettes away . Never
& W AR NING (continued )
dump benzine on the ground , into ope n streams or do wn sew age
drain s.
• Be sure to observe all safet y and env ironmental regulat ions .
Follow all in struction s on the cont ainer .
• Alway s read and heed all WARNINGS and other information
=> page 288 . •
Chassis
Hav e the underc oating c hecked for damage from tim e to
time.
T he lower body shell of your Audi is also thoroughly protected
against corrosion .
Any damage to the undercoat ing caused by road hazards s hou ld be
repaired promptly.
& WARNING
Too much undercoating in the wrong place s can cau se a fire .
• Do not appl y additional undercoating or rustproofing on or
near the exhaust manifold , exhau st pipes , catalytic converter or
h eat shield s. Wh ile dr iving , the sub stan ce used for underco ating
could overheat and cau se a fire .
• Alway s re ad and heed all WARNINGS and other info rm ation
=> page 288 . •

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essential to have a long -lasting corrosion protection reapplied to al l
su rfaces, sea ms, joi nts a nd compo nents i n th e eng in e c om pa rt ­
m ent .
& WARNING
Be aware: The engine compartment of any motor vehicle is a
potentially hazardous area.
• Before working in the engine compartment, be sure to read the
information
::::> page 299.
• Before reaching into the front plenum panel, always remove the
ignition key . Otherwise, the windshield wiper system could unin ­
tentionally be switched on , possibly causing personal injury from
the moving wiper linkage .
• Never reach into the area around or touch the radiator fan . The
auxiliary fan is temperature controlled and can switch on suddenly
-even when the ignition is off.
• Do not wash, wax or dry the engine with the engine running .
Moving or hot parts could injure you.
• Do not clean the underside of the chassis, fenders, wheel
covers, or other hard to reach parts without protecting your hands
and arms. You may cut yourself on sharp-edged metal parts .
• Always read and heed all WARNINGS and other information
=> page 288 . •

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Tires and wheels
Tires
General notes
Tires may be the least appreciated and most abused parts
of a motor vehicle.
Tires may be the least appreciated and most abused parts of a
motor vehicle. Tires are, however, one of the most important parts
of a vehicle, particu lar ly considering the comparatively smal l patch
of rubber on each tire that assures that all -important contact
between you, your vehic le and the road.
Maintaining the correct tire pressure, making sure that your vehicle
and its t ires do not have to carry more we ight than they can safely
handle, avoiding damage from road hazards and regularly
inspecting tires for damage inc luding cuts, slashes irregular wear
and overa ll condition are the most important things that you can do
to help avoid sudden tire failure inc luding tread separation and
blowouts.
Av oidin g dam age
If you have to drive over a curb or similar obstac le, drive very slowly
and as close as possib le at a right angle to the curb .
A lways keep chem ica ls including grease, oi l, gaso line and brake
flu id off the ti res.
Inspect t he t ires regu larly fo r damage (cuts, cracks or b listers, etc .l.
Remove any foreign bodies embedded in the treads .
Storing tire s
Mark tires when you remove them to indicate the direction of rota­
tion . This ensures you to be able to moun t them correctly w hen you
reinstal l them. When removed, the wheels or tires shou
ld be stored in a coo l, dry
and preferably dark place .
S tore tires in a vert ical pos it ion if they are not mounted on r ims, in
a horizonta l position if they are mounted on rims.
New tire s
New tires have to be broken in=> &.
The tread depth of new ti res may vary, according to the type and
make of tire and the tread pattern .
Hidden dam age
Damage to tires and rims is often not readily visible . If you notice
unusual vibration or the vehicle pu lls to one side, this may ind ica te
that one of the tires has been damaged . The tires must be checked
immediately by an authorized Audi dealer or qual ified workshop .
Unidir ec tiona l tir es
A unid irec tional tire can be identified by arrows on the sidewa ll, that
point in the direction the tire is designed to rotate. You must fo llow
t he specified directio n of rotation . Th is is necessary so that t hese
tires can deve lop their optimum characteristics regarding grip, road
noise, wear and hydrop laning resistance . For more information
=> page 357.
& WARNING
New t ires or tire s th at a re old , worn or d am aged cann ot pro vide
maximum control and braking ability.
• New tire s tend to be slipper y and mu st be bro ken in . To redu ce
the risk of lo sin g con tro l, a collision and seriou s per sonal injurie s,
dri ve w ith spe cial care f or the fi rst 350 mile s (560 km l.
• Driving wi th worn or damaged tir es can l ead to lo ss of control ,
sudd en tire f ailure , inc ludi ng a blowout and sudden defl atio n, .,_

Tires and wheels -
----------------
•
& WARNING (continued)
crashes and serious personal injuries . Have worn or damaged tires
replaced immediately.
• Tires age even if they are not being used and can fail suddenly,
especially at high speeds. Tires that are more than 6 years old can
only be used in an emergency and then with special care and at
low speed.
Glossary of tire and loading terminology
Accessory weight
means the combined weight (in excess of those standard items
which may be replaced) of automatic transmission, power steering,
power brakes, power windows, power seats, radio, and heater, to
the extent that these items are available as factory-installed equip­
ment (whether installed or not).
Aspect ratio means the ratio of the height to the width of the tire in percent.
Numb ers of 55 or lower indicate a low sidewall for improved
steering response and better overall handling on dry pavement.
Bead
means the part of the tire that is made of steel wires, wrapped or
reinforced by ply cords and that is shaped to fit the rim.
Bead separation
means a breakdown of the bond between components in the bead.
Cord
means the strands forming the plies in the tire.
& WARNING (continued)
• Never mount used tires on your vehicle if you are not sure of
their
"previous history." Old used tires may have been damaged
even though the damage cannot be seen that can lead to sudden
tire failure and loss of vehicle control.
• If you notice unusual vibration or if the vehicle pulls to one side
when driving, always stop as soon as it is safe to do so and check
the wheels and tires for damage.
•
Cold tire inflation pressure
means the tire pressure recommended by the vehicle manufacturer
for a tire of a designated size that has not been driven for more than
a couple of miles (kilometers) at low speeds in the three hour period
before the tire pressure is measured or adjusted.
Curb weight
means the weight of a motor vehicle with standard equipment
including the maximum capacity of fuel, oil, and coolant, air condi­
tioning and additional weight of optional equipment.
Extra load tire
means a tire design to operate at higher loads and at higher infla ­
tion pressures than the corresponding standard tire. Extra load tires
may be identified as
"XL", "xi", "EXTRA LOAD", or "RF" on the side ­
wall.
Gross Axle Weight Rating
("GAWR")
means the load-carrying capacity of a single axle system, measured
at the tire -ground interfaces.
Gross Vehicle Weight Rating
( " GVWR")
means the maximum total loaded weight of the vehicle.
Vehicle care

Tires and wheels -
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Sidewall
means that portion of a tire between the tread and bead.
Speed rating means the speed at which a tire is designed to be driven for
extended periods of time. The ratings range from 93 mph (150 km/h)
to 186 mph (298
km/h)=> page 338. You may not find this informa­
tion on all tires because it is not required by law.
The speed rating letter code, where applicable, is molded on the tire
sidewall and indicates the maximum permissible road
speeds=> &
in "Winter tires" on page 341.
Tire pressure monitoring system
means a system that detects when one or more of a vehicle's tires
are underinflated and illuminates a low tire pressure warning tell­
tale.
Tread
means that portion of a tire that comes into contact with the road.
Tread separation
means pulling away of the tread from the tire carcass.
Treadwear indicators (TWI)
means the projections within the principal grooves designed to give
a visual indication of the degrees of wear of the tread . See
=> page 335, "Tread Wear Indicator (TWI)" for more information on
measuring tire wear .
Uniform Tire Quality Grading
is a tire information system developed by the United States National
Highway Traffic Safety Administration (NHTSA) that is designed to
help buyers make relative comparisons among tires. The UTQG is
not a safety rating and not a guarantee that a tire will last for a
prescribed number of miles (kilometers) or perform in a certain way.
It simply gives tire buyers additional information to combine with
other considerations, such as price, brand loyalty and dealer recom- mendations
. Under UTQG, tires are graded by the tire manufac­
turers in three areas: treadwear, traction, and temperature resis­
tance . The UTQG information on the tires, molded into the
sidewalls.
U.S. DOT Tire Identification Number (TIN)
This is the tire's "serial number" It begins with the letters "DOT" and
indicates that the tire meets all federal standards . The next two
numbers or letters indicate the plant where it was manufactured,
and the last four numbers represent the week and year of manufac­
ture. For example,
DOT ... 2207 ...
means that the tire was produced in the 22th week of 2007 . The
other numbers are marketing codes that may or may not be used by
the tire manufacturer . This information is used to contact
consumers if a tire defect requires a recall.
Vehicle capacity weight
means the rated cargo and luggage load plus 150 lbs. (68 kilograms)
times the vehicle's total seating capacity as listed on the label located either on the driver's side 8-pillar or on the inside of the fuel
filler flap.
Vehicle maximum load on the tire
means that load on an individual tire that is determined by dis trib­
uting to each axle its share of the maximum loaded vehicle weight
and dividing by two.
Vehicle normal load on the tire
means that load on an individual tire that is determined by dis trib­
uting to each axle its share of the curb weight, accessory weight,
and normal occupant weight (distributed in accordance with table
below => page 328) and dividing by two. ..,.
Vehicle care