inflation pressure AUDI S8 2008 User Guide

Tires a nd wh eels -
----------------
•
0
©
U.S. DOT tire identification number
Sever snow cond itions
Ti re ply composition and materials used
Maximum load rating
Treadwear, traction and temperature grades
@ Maximum permissible inflation pressure
The tires and rims are essentia l parts of the vehicle 's design. The
tires and rims approved by Audi are special ly matched to the char­
acteristics of the vehic le and can make a major contribution to good
road hold ing and safe handling when in good cond ition and prop­
erly inf lated
=> .&, .
We recommend tha t all work on tires and wheels be performed by
an authorized Audi dea ler . They are familiar with recommended
procedures and have the necessary special too ls and spare parts as
we ll as the proper facilities for disposing of the old tires.
Authori zed Audi dea lers have the necessary information about tech ­
n ical requirements for insta lling or changing tires and rims.
R ep lac ing t ires and wh eels
Tires shou ld be replaced at least in pairs and not individual ly (for
examp le both front tires or both rear tires together).
Be sure to read and heed the informat ion to the tire pressure mon i­
toring
system => page 338.
Always buy replacement radial tires t hat have the same specifica ­
tions as the tires approved for your vehicle by Audi. Rep lacement
tires must always have the same load rating specification as the
origina l equipment or approved optional t ires listed in the table
=> page 328.
Audi -approved specification tires are specially matched to your
vehicle and its load limits, and can contribute to the important road- holding, driving characteristics, and safety of the vehicle
. The table
(=> page 328) lists specificat ions of the tires approved for the Audi
models covered by your Owner's Literature .
The tire pressure labe l located either on driver's side 8 -pil lar or
ins ide the fuel fi ller
flap( => page 328, fig. 273) lists the specifica­
tions of the original equipment tires installed on your vehicle at the
t ime it was manufactured.
Federa l law requires tire manufacturers to place standardized infor ­
mation on the sidewa ll of all
tires => page 336, fig . 276. This informa ­
tion identifies and describes the fundamental characteristics, the quality grade of the tire and a lso provides a tire identification
number for sa fety standard cert ificat ion and in case of a recall.
T ire s pec ificat ion s
Knowledge of tire specifications makes it easier to choose the
correct tires . Radial tires have the tire specifications marked on the
sidewall, for example :
255/45 R 18 99 H
This contains the fo llowing information:
P Indicates the tire is for passenger cars (where applicable)
255 Nominal tire width in mm of the tire from sidewall edge to side -
wa ll edge. In general, the larger the number, the wider the tire
45 Height/width ratio in percent (aspect ratio)
R Tire construction: Radial
18 Rim diameter code (in inches)
99 Load rat ing code
H Speed rat ing letter code
XL (or "xi", "EXTRA LOAD" or "RF") indicates that the tire is a "Rein­
forced" or an "Extra Load" tire
M +S (or "M/S") Indicates tha t the tire has some mud and snow capa ­
bility
The tires could a lso have the information of direction of rotation
=> page 324.
Vehicle care

Tires and wheels 11111 --------------------------------------------
•
Wheel bolts
Wheel bolts must al wa ys be tightened to the correc t
tor que .
The design of wheel bo lts is matched to the factory installed rims. If
di fferent r ims a re fitted, t he co rrect w heel bo lts wi th the rig ht len gth
and correct ly shaped bolt heads m ust be used. This ensures that
w he els a re fitt ed se cu rel y and that t he bra ke syste m functi on s
correctly.
In certa in ci rc ums ta nces, yo u may no t use wheel bo lts fr om a
differ ent vehicle - eve n if it is the sa me
model=:> page 382.
& WARNING
Improperly tightened or maintained wheel bolts can become loose
causing loss of control, a collision and serious personal injury.
• Always keep the wheel bolts and the threads in the wheel hubs
clean so the wheel bolts can turn easily and be properly tightened .
• Never grease or oil the wheel bolts and the threads in the wheel
hubs. They can become loose while driving if greased or oiled,
even if tightened to the specified torque .
• Only use wheel bolts that belong to the rim being installed .
• Never use different wheels bolts on your vehicle.
• Always maintain the correct tightening torque for the wheel
bolts to reduce the risk of a wheel loss .
If the tightening torque of
the wheel bolts is too low, they can loosen and come out when the
vehicle is moving . If the tightening torque is too high, the wheel
bolts and threads can be damaged and the wheel can become
loose .
0 Note
The specified torque for the wheel bo lts is 9 0 ft lb (12 0 N m) with a
t olerance o f± 7,4 ft lb(± 10 Nm). T orque whee l bolts diago nally.
After changing a whee l, the torque must be checked as soon as possible with a torque wrench
-preferably by an authorized Audi
dea ler o r qua lif ied wo rksho p.•
Low aspect ratio tires
You r Aud i is fact ory- eq uip pe d w it h lo w aspect rati o tire s. T hese tir es
hav e been thorough ly t ested and been se lect ed specifical ly for your
mod el for thei r supe rb pe rf or manc e, r oad f eel an d ha nd ling under
a variety of driving conditions. As k your authorized Audi d ealer for
m or e de tails.
The low aspect rat io o f th ese t ires is indicat ed by a nume ra l of 55 or
less in the tire's size designatio n. The numeral represents the ratio
o f t he tir e's s idewa ll he ig ht in r ela ti on to it s tread w idt h ex pressed
in percentage . Conventiona l tires have a height/width ratio of 60 or
more.
The performan ce of low -aspe ct-ratio tires is particularly sensitive to
improper inflation pressure . It is therefore important that low
aspect ratio tires are inflated to the specified pressure and that the
inflation pressure is regularly checked and maintained . Tire pres­
sures should be checked at least once a month and alway s before a
long
trip :::::, page 331, "Checking tire pressure" .
What you can do to avoid tire and rim damage L ow a spect ratio tires can be damaged mo re easily by impact with
pot ho les, cu rbs, gull ies o r ridge s o n th e road, part icular ly if th e tire
is underinf lated .
I n or der to mini mize th e occurren ce of i mpac t da mag e to the tires
of your vehicle, we recommend that you observe the fol lowing
pr ecaut ions :
• Alwa ys m aint ain recom mended inflatio n pressu res . C he ck you r
t ire p res su re eve ry 2,000 mi les (3, 000 k m) and add ai r if neces sary .
• D rive carefully on roads with potho les, deep gullies or ridges .
The impac t from d riving th rough or ove r such o bstacles can
da mage you r tir es . Imp act with a curb may a lso caus e damage to
your tire s. .,_
Vehicle care

What do I do now? Ill
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•
-Disengage and lower the floor panel before you close the
luggage compartment lid again.
Storing the replaced wheel
-Place the replaced wheel inside the spare wheel well in
the luggage compartment.
Tighten the knurled retaining screw clockwise to secure
the wheel in place.
-Disengage and lower the floor panel before you close the
luggage compartment lid again.
& WARNING
Loose items in the passenger compartment can cause serious
personal injury during hard braking or in an accident .
• Never store the spare wheel or jack and tools in the passenger
compartment.
• Always store all jacking equipment, tools, and the spare wheel
in the luggage compartment .
• Tighten the knurled retaining screw for the spare wheel
securely.
[ i] Tips
Check the inflation pressure of the spare tire periodically to keep the
tire ready for use. •
Changing a wheel
Before changing a wheel
Observe the following precautions for your own and your
passenger's safety when changing a wheel.
-After you experience a tire failure, pull the car well away
from moving traffic and try to reach level ground before
you stop
~ &,. .
-All passengers should leave the car and move to a safe
location (for instance, behind the
guardrail) ~&,. .
-Engage the parking brake to prevent your vehicle from
rolling
unintentionally ~&,. .
-Move selector lever to position P ~ &,..
-If you are towing a trailer: unhitch the trailer from your
vehicle.
-Take the jack and the spare tire out of the luggage
compartment~ page 349.
& WARNING
You or your passengers could be injured while changing a wheel if
you do not follow these safety precautions:
• If you have a flat tire, move a safe distance off the road. Turn off
the engine, turn the emergency flashers on and use other warning
devices to alert other motorists.
• Make sure that passengers wait in a safe place away from the
vehicle and well away from the road and traffic.
• To help prevent the vehicle from moving suddenly and possibly
slipping off the jack, always fully set the parking brake and block
the wheel diagonally opposite the wheel being changed. When one _..
Do -it -yourself service

______________________________________________ A_ l_,_ p _h_ a_ b_e _t_ic _ a_l _in _ d_e _ x __ lll
T
Tachometer . .... .... .... ... .... .... . 13
Technical modifications ...... ...... .. 383
T emperature
Climate controls ...... .... ..... .. . 117
Setting for the driver's and front passen-
ger's side ... ...... .... ... .... .. 117
Tether strap ........................ 263
Securing the upper tether strap 264
The first 1,000 miles (1,500 km) and
afterwards .. .... .... ... .... .... 277
Tie -down eyelets ... .. .... ...... . 100, 207
Tips for the environment
Saving fuel ... .... .... ... .... .... 104
Using the air conditioner only when necessary ... .... ....... .... .... 123
ti ptron ic® . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Automatic Shift Lock (ASU ... .... .. 165
Driving .. .. .. .... .... ........... 163
Dynamic shift program . ...... ... .. 166
Fail -safe mode ... .... .... ...... .. 168
Kick -down ..... ...... .... ... .... . 166
Manual shift program ........ .... . 167
Se lector lever . .... .... ... .... .... 164
Tire pressure .. ... .. .... .... ...... .. 331
Tire pressure monitoring system ... .... 41
Displaying tire pressures . .... .... .. 43
Initialize wheels ... .... ... .... .... . 45
Learning process .................. 44
Loss of air pressure ............. 20, 42
Malfunctions .... .... .... .... .... . 45
Sensors ....... .. .... .... ...... .. 338
Controls and equip­ ment Safety first Stor
ing tire pressures ....... .... ... 44 Towing
Tires and wheels .. .... .... .... ... 338 Tow truck procedures .... .... .... . 366
Valves ..... .. .... .... .... .... ... 338
Towing hitch
Tire service life ........ .... ... .. .... 335
Audi parking system .............. 180
Tires ........ .... ... .... .... .... ... 324 Towing loop ..... .... .... ... .... .... 367
Replacing .. ...... .... ...... ... .. 338 front .... ... .. .... .... ...... ... .. 367
Service life . ........ .... ... .. .... 335 rear ............................ 368
speed rating letter code .. ... .. .... 338
Trailer towing . .... ... .... ...... ... .. 282
Tire manufacturing date ...... .... . 338
Operating instructions . ...... ... .. 283
Tire specifications ................ 337
Technical requirements ... .... 282, 283
Tread depth ........ ....... ...... 335
Trailer towing tips ................ 284
Uniform tire quality grading .... .... 340
Train
Winter tires ... .... .... .... .... ... 341
Transporting your vehicle .. .... .... 369
Tires and ve hicle load limits . ...... ... 333
Transmission
Tires and wheels
See Automatic transmission .. ...... 163
Checking tire pressure .... .... .... 331
Transport Canada . .... ... ........ ... 208
Cold tire inflation pressure .. .... ... 328
Dimensions ...................... 336 Transporting your vehicle
.... .... ... . 369
Tread Wear Indicator (TWI) ....... .... . 335
Genera l notes .................... 324
G lossary of tire and loading termino logy
325
New tires and whee ls .. .... .... ... 336
Replacing .... .... .... .... .... ... 337
Snow chains ........ .... ... .. .... 342 Trip computer
Fuel consumption .... .... .... .... . 38
Mi leage ... ........... .... .... .... 38
Sing le-trip memory .. ........ .... .. 39
Total-trip memory .. ...... ..... .. .. 39
Tire pressure monitoring system .... 338
Tires and vehicle load limits .. ...... 333
Wheel bolts .. ....... ...... .... ... 343 Trip
odometer ..... .. .... ....... ... .. 14
What does it mean when dEF appears in the trip odometer disp lay? ......... 14
Winter tires ......... ...... .... ... 341 Trunk
Tires/Wheels
See Rear lid ... .... .... ... .... .... . 55
Low aspect ratio tires . .... ........ 343 Trunk
escape handle .. .... ... .... .... 348
Tools ... .... .... ... .... .... .... .... 350 Turn signals
... .. .... .... .... ...... .. 73
Torn or frayed safety be lts .. .... .... .. 212 Warning/indicator
lights .. ........ .. 19
Touch-up paint . .... ... .... .... .... . 292
Vehicle operation Vehicle care Do-it-yourself service Technical data

-Alphabetical index
---=------------------------------------------------
u
Undercoating 294
Unfastening safety belts ...... ...... . 215
Un idirect iona l tires ....... ....... .... 324
Uniform tire quality grading
Un locking 340
Power locking switch . . . . . . . . . . . . . . 53
Rear lid/trunk lid ...... .... ...... .. 55
Remote control ................... 51
Using the key .. .... ....... .... .... 52
V
Vanity mirror
front ... .. .... .... .... ... .... .... 77
rea r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Vehic le elec trical system ...... ...... .. 18
Vehic le identification label ........ ... 374
Vehicle Identification Number (VI N) .... 374
Vehicle jack .... ... .. .... .... ... 349, 354
Vehicle literature ... .. .. ..... .. .... ... 5 Brake system
.... . .. .. .... ... .... . 22 Wheel bolts
Cruise control ..... .... ... .... .... 21 Torque ... .... .... .... ... .... ... 343
Electromechanica l parking brake .... 22 Wheels ............................ 324
Electronic power control .. .... .... . 18 Cast alloy ....................... 293
Electronic stabilization program (ESP) 18 Checking tire pressure ............ 331
Fog lights .. ...... .... ...... ... .. . 19 Cold tire inflation pressure ...... .. 328
Generator . . . . . . . . . . . . . . . . . . . . . . . . 18
High beam . . . . . . . . . . . . . . . . . . . . . . . 19
Instrument cluster . . . . . . . . . . . . . . . . . 12
Ma lfunction Indicator Lamp (MIU . ... 20
Rear fog light s ........ ........ .... 19
Safety belt .... .... .... .... .... ... 20
Tir e pressure monitoring system .... 20
Turn signals ... .... .... .... .... ... 19
Warranty coverages ...... .... .... ... 380
Washer reservoir .. ... .... .... .... ... 323
Washing ...... .... ..... ............ 288
Automatic car wash ...... .... .... 289
by hand .. .... ... .... .... .... ... 289
with a power washer ... .. .. ....... 290
Washing the vehicle ..... ...... .... .. 288
Waxing ....... ... .... .... .... .... .. 291 Genera
l notes ....... ... .... .... .. 324
Glossary of tire and loading terminology .
325
New tires and wheels .. ........... 336
Tires and vehicle load limits ....... 333
When must a safety belt be replaced? .. 212
When must the airbag system be inspected?
229
When should I ad just the tire pressures?
332
When should I check the tire pressures? 332
Where can I find the tire pressures for my
car? ... .. .... .... .... ..... .. ... 331
Why safety belts? ...... ... ... ... 209, 21
o
Windows
Cleaning ........................ 292
Vehic le transpo rt .... .... .... ...... . 369 Wear indicator .... .... ... .... .... ... 335 Convenience open
feature ...... .... 64
Defogging ....... ........ ....... 120
Vehic le-care products ... .... .... .... 288 Weatherstrips ... ....... ...... .... .. 293
Venti lated seats .. .... .... ... .... ... 118 Weights
..... .... .... .... .... ... ... 375
w
Warning/indicator lights ... .. .... .... . 16
Adaptive Air Suspension ....... . 20, 21
Adaptive Cruise Control .. .. .. .... . 145
Airbag system . . . . . . . . . . . . . . . . . . . . 19
Anti-lock brake system (ABS) . . . . . . . . 21 What happens
if you wear your safety belt too
loose? ... .... .... .... .... .... .. 214
What happens to unbelted occupants? . 211
What impairs driving safety? ..... ..... 199
What should I do after changing a wheel?
332
What should I do after replacing wheels?
332 Defrosting
.... .... .... ... .... ... 120
Rapid defrosting/defogging .... .... 122
Windshield defogger/defroster .. ...... 123
Windshield washer fluid Low level ...... ............... .... 35
Windshield wipers Installing new wiper blades . .... .... 82
In termittent wiping .... ... . .... .. .. 80
One -tap wiping ........ .... .... ... 80