wheel AUDI S8 2009 Workshop Manual

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Speed
The higher the speed, the more difficult 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
im med ia tel y if the trailer shows the slightest
sign of swaying.
Do not try to s top the swayi ng by accelerating.
Observe speed limits. In some areas, speeds for vehicles towing
trai lers are lower than for regular vehicles .
Always apply brakes ear ly. When driving downhill, 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.
C ool ant t emp era tur e
The coolant temperature gauge=> page 12 must be observed care­
fully. 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 flashing
- F- , pull off the road, stop and let the engine idle for
about two minutes to prevent heat build-up.
& WARNING
A nyo ne n ot properly re str aine d in a moving vehi cle i s at a mu ch
g re ater ri sk in an accident . Never let any on e r ide in y our car who
is n ot pr operl y wea ring th e re stra ints pr ovided b y 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 will greatly depend on how carefully you
l
oad your trailer and operate your r ig.
Before you actually tow your trailer, practice turning, stopping and
backing up in an area away from traffic . Keep practicing unti l you
have become comp letely familiar with the way your vehicle-trai ler
combination behaves and responds.
Back ing up is difficult and requires practice. Backing up with a
trailer generally requires steering action opposite to that when backing up your vehic le without a tra iler.
Ma intain 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 nor mally wou ld because of the added load . Make su re you have
enough room to pass. After passing, allow plenty of room for your
trai ler befo re changing lanes again .
Avoid jerky starts, sharp turns or rapid lane changes.
[ i ] T ips
• Do not tow a trailer during the break -in period of your vehicle.
• I f you tow a trailer, your Audi may require more frequent main te­
nance due to the extra load=>
page 382. •
Parking on a slope
Do n ot park on a slope with a trailer. If it cann ot be
avoi ded, do so only after d oing the followi ng:
When p arking :
-Apply the foot brake.
- Have someone p lace chocks under both the vehicle and
the trailer wheels. ._

-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.
Wh en r est arting aft er parking :
-Apply the foot brake.
- Start the engine.
- Move the selector lever to
D .
- Release the parking brake and slowly pull out and away
f rom the whee l chocks.
- Stop and have someone retrieve the wheel chocks .
[ i ) Tip s
If you move the selector lever of the automatic transmission to P
befor e applying th e parking brake and before blocking 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
Tr
aile r t owing
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 correct ca re will co ntribu te to
maintaining the beauty and value of your Audi.
Furthermore, good care may be a condition for substantiating a
war ranty claim should co rros ion damage 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 for clea ning the e xter ior
and interior of your vehicle.
Whethe r you use p roducts recommended by Audi or other c ommer ­
cia lly availab le cleaning agents , please make sure you apply them
correctly.
& WARNING
• Cleaning agents may be poisonous. Keep them out of the reach
of ch ildren .
• Heed all caution label s.
• Always read directions on the contai ner before using any
product. Follow the di rection s carefully .
• Most chemical cleaners are concentrated and have to be
d iluted.
• Use spot removing fluids only in well ventilated area s.
• Do not use gasoline , kerosene , die sel fuel , nail polish remover
or other volatile fluids . They may be toxic , flammable or hazardous
in other way s. Do not wash , wa x or dry the vehicle w ith the igni ­
tion on or the engine running.
& WARNING (continued )
• Do not clean the under side s of chassis , fenders , wheel cove rs,
etc . without protecting your hands and arms. You may cut yourself
on sharp -edg ed metal parts .
• Moisture and ice on brakes may impair braking effi ciency
=> page 272 , "General info rmation ". Test the brake s carefully each
time you wa sh the vehicle.
~ For the sake of the environment
Se lect only enviro nmenta lly friend ly c leaning products . Leftover
clean ing products should not disposed of in the household waste. •
Care of exterior
Washing
Frequen t washing pro tects the vehi cle.
Th e bes t protection against envi ronmental influences 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
• Environmenta l influences
T he longer bird droppings, insects, tree resin, road and industrial
gri me, tar, soot, road salt and ot her materials 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 -
sive effect, particularly when humidity 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 290. •
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 additional 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 290. •
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 290.
-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 w ipe 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
~ page290. _..
Vehicle care
I t •

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•
The best way to remove snow from windows and mirrors is to use a
brush . Use a non -abrasive
pla stic ice scraper -better still, a spray
deicer -to remove
ice from w indows and mirrors .
Oil, grease or silicone residue can be removed with
glas s 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 remova l.
Windows should also be c leaned on the inside at regular interva ls .
Never dry windows with the same chamois that you use to dry
painted surfaces . Wax residue on the chamois can impa ir v ision
through the windows.
& WARNING
• Alway s read and heed all WARNINGS and other information
=> page 2 90.
• The wind shield mu st not be treated with water -repellent mat e­
rial s. They c an in crease glare u nder poor visibilit y condition s such
as wetne ss , darkne ss , or when t he sun is low on the horizon. In
a ddition , they can cau se the win d sh ield wiper s to chatter .
0 Note
• Never use warm or hot water to remove snow and ice from
windows and mirrors . Th is cou ld cause the glass to crack.
• To prevent damage to the wires of the rear defogger, do not p lace
any adhesive stickers on the inside of the rear window over the
wires.
• To he lp 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 we atherstrips as well .
Apply a suitable rubbe r con ditioner to the weatherstr ips
from t ime to t ime.
To be able sea l properly, the weatherstrips around the hood, doors,
rear lid, etc . must remain pliable. Spray the weatherstrips with sili­
cone or coat them with ta lcum powder or glycer ine to retain the
flexibility of the rubber and to protect them against freezing in the
winte r.
& WARNING
Alway s read and heed all WARNING S and other information
=> page 290.
[ i ] Tip s
Keep si licone sprays off the windshield to avoid wiper smear in
rain .•
Cast (light) alloy wheels
Cast (light) alloy wheels require special care.
- Wash the wheels w ith a sponge or hose b rush every
other week.
For de ep cle aning afterwards, use only a dedicat ed
acid­
free cast al loy whee l c leaner.
R ub a coat of
liquid wax onto the rims ever y thr ee mon th .
Be sure t o reach and t reat a ll pa rts of t he r im.
To preserve the decorative appearance of the cast al loy wheels,
some special care is necessary . In addition to road dirt and salt,
Vehicle care I t •

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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 formulated for a lloy r ims . Safe
products are available at your Audi dealer. Never leave the cleaner
on the ri ms longer than specified on the label. If not rinsed of f
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 ­
tive coating has been chipped, e.g . by kicked up road dirt, touch i t
up as soon as poss ible .
& WARNING
• Moisture and i ce on b rake s may affe ct b raking effi cien cy
~ page 272 , "General information ". Te st the brake s carefully ea ch
t ime you wa sh the vehi cle .
• Always read and heed all WARNINGS and other information
~ pag e 290. •
Body cavity sealing
The body cavity sealing does not nee d to be checked .
All body cavities which could be affected by corrosion have been
t horoughly 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 dangerous.
• Ben zine is fla mmab le and to xic . If you use be nzine fo r removing
the wax , keep sparks, f lame and lighted cigarettes away . Never
& W ARN ING (continued )
dump benz ine on the ground , into open streams or down sewage
dra in s.
• Be sure to observe all safety and env ironmental regulat ions .
Follow all in struction s on the cont ainer .
• Alway s read and heed all WARNINGS and other inform ation
~ page290 .•
Chassis
Have the u nderc oating c hecked for dama ge from tim e to
time.
T he lower body shell of your Audi is also thoroughly protected
aga inst corrosion .
Any damage to the undercoat ing caused by road hazards shou ld be
repaired promptly.
& WARNING
Too much undercoating in the wrong place s can cau se a fire .
• Do not app ly addition al undercoating or rustproofing on or
near the exhaust manifold, exhau st pipe s, catalytic converter or
he at shield s. While dr iving , the sub stance used for underco ating
could overhe at and cau se a fire .
• Alwa ys read and heed all WARNINGS and other info rm ation
=> page290 .•

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essential to have a long-lasting corrosion protection reapplied to al l
s urf aces, sea ms, joi nts a nd compo nents i n th e en gine c om par t­
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 301.
• Before reaching into the front plenum panel, always remove the
ignition key . Otherwise, the windshield wipe r system could unin ­
tentionally be switched on , possibly causing personal in jury 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 290 . •

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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 larly considering the comparatively small 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 tires do not have to carry more weight than they can safely
handle, avoiding damage from road hazards and regularly inspecting tires for damage inc luding cuts, s lashes irregular wear
and overa ll condition are the most important things that you can do
to help avoid sudden tire failure including tread separation and
blowouts.
A vo iding d am age
If you have to drive over a curb or similar obstac le, drive very slowly
and as close as possible at a right angle to the curb.
A lways keep chemica ls including grease, oi l, gaso line and brake
fluid off the tires.
Inspect the ti res regu larly for damage (cuts, cracks or b listers, etc.l .
Remove any foreign bodies embedded in the treads.
Storing tir es
Mark tires when you remove them to indicate the direction of rota ­
t ion. This ensures you to be able to mount them correctly when 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 vertical pos it ion if they a re not mounted on r ims, in
a horizonta l position if they are mounted on rims.
New tir es
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.
H idd en damage
Damage to tires and rims is often not readily visible. If you notice
unusual vibration or the vehicle pu lls to one s ide, this may indicate
that one of the tires has been damaged . The tires must be checked
immediately by an authorized Audi dealer or qualified workshop .
Unidire cti ona l t ires
A unidirectional tire can be identif ied 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 . This is necessary s o that these
tires can develop their optimum characteristics regarding grip, road noise, wear and hydrop laning resistance . For more information
=>
page 359.
& WARNING
New t ires o r ti re s th at a re old , worn or d am aged cann ot pro vid e
maximum cont rol and braking ability .
• New tires te nd to be slippery and mu st be bro ken in . To redu ce
the ri sk o f lo sin g co ntro l, a collis ion and serious per sonal injurie s,
dri ve w ith special care f or the fi rst 350 m ile s ( 560 km l.
• Driving w ith w orn or damaged tire s can lead to lo ss of control ,
sudd en tir e fa ilure , inc ludi ng a blowout a nd sudden defl atio n, ..,_

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•
& W ARNING (continu ed )
crashes and serious personal in jur ies . Have worn or da maged t ires
replaced immediately .
• Tires age even if they are not being u sed and can fail suddenly ,
especially at high speeds. T ires that are more than 6 years old can
only be used in an emergency and then w ith special care and at
low speed.
Glossary of tire and loading terminology
Accessory weight
means the co mbined we ig ht ( in excess o f those sta nda rd items
which may be rep laced) of automatic transmission, power steering,
power brakes, power w indows, powe r seats, rad io, a nd heater, to
the extent that these items are avai lab le as factory-installed equip­
m ent (w hether insta lled or not).
Aspect ratio means t he ratio o f th e height to t he w idt h of the tire in perce nt.
N umbers of 55 or lower indicate a low sidewa ll for improved
steer ing respo nse and b ette r overall ha ndl ing on dry pave ment.
Bead
means the part of the tire that is made of stee l wires, wrapped or
reinforced by ply cords and that is shaped to fit the rim.
Bead separation
means a breakdow n of the bond be tween co mponents i n the bead.
Cord
m eans the strands fo rmi ng the plies in the ti re.
& W ARNING (continued )
• Never mount used tires on your vehicle if you are not sure of
their "previous history. " Old used t ire s may ha ve been damaged
even though the damage cannot be seen that can lead to sudden
tire failure and lo ss of vehicle control.
• If you noti ce 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
mea ns t he ti re pressure reco mm ended by the ve hicle ma nufacturer
for a tire of a designated size that has not been d riven for more tha n
a cou ple o f miles (k ilometers) at low speeds in t he t hre e ho ur per iod
before the tire pressure is measured or ad justed .
Curb weight
means the weight of a moto r vehic le with standard equipment
i nc lud ing the max imu m capac ity o f fue l, o il, and coola nt, a ir c ond i­
tioning and additiona l weight of optional equipment.
Extra load tire
means a tire des ign to operate at higher loads and at highe r infla ­
tion pressures than the corresponding standard tire. Extra load tires
may be identified as "XL", "xi", "EXTRA LOAD", or "RF" on the side ­
wa ll.
Gross Axle Weight Rating ("GAWR ")
means the load -carrying capacity of a sing le ax le system, measured
at the ti re -ground interfaces.
Gross Vehicle Weight Rating ("GVWR "l
mea ns the ma ximum tot al l oade d weigh t of the vehicle.
Vehicle care
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Groove
means the space between two adjacent tread ribs.
Load rating (code)
means the maximum load that a tire is rated to carry for a given
inflation pressure . You may not find this information on all tires
because it is not required by law.
Maximum load rating
means the load rating for a tire at the maximum permissible infla­
tion pressure for that tire.
Maximum loaded vehicle weight
means the sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight, and
(d) Production options weight
Maximum (permissible) inflation pressure
means the maximum cold inflation pressure to which a tire may be
in flated. Also called "maximum inflation pressure ."
Normal occupant weight
means 150 lbs. (68 kilograms) times the number of occupants
seated in the vehicle up to the total seating capacity of your vehicle.
Occupant distribution
means distribution of occupants in a vehicle .
Outer diameter
means the overall diameter of an inflated new tire.
Overall width
means the linear distance between the exteriors of the sidewalls of
an inflated tire, including elevations due to labeling, decorations, or
protective bands or ribs .
Ply
means a layer of rubber -coated parallel cords.
Production options weight
means the combined weight of those installed regular production
options weighing over 5 lbs. (2.3 kg) in excess of those standard
items which they replace, not previously considered in curb weight
or accessory weight, including heavy duty brakes, ride levelers, roof rack, heavy duty battery, and special trim.
Radial ply tire
means a pneumatic tire in which the ply cords that extend to the
beads are laid at substantially 90 degrees to the centerline of the
tread.
Recommended inflation pressure
see =:> page 327, "Cold tire inflation pressure".
Reinforced tire
means a tire design to operate at higher loads and at higher infla­
tion pressures than the corresponding standard tire. Reinforced
tires may be identified as "XL", "xi", "EXTRA LOAD", or "RF" on the
sidewall.
Rim
means a metal support for a tire or a tire and tube assembly upon
which the tire beads are seated .
Rim diameter
means nominal diameter of the bead seat. If you change your wheel
size, you will have to purchase new tires to match the new rim diam ­
eter.
Rim size designation
means rim diameter and width.
Rim width
means nominal distance between rim flanges .