steering AUDI S8 2009 Owner's Guide

Airbag syst em -----------------=~-
repair costs or even the lack of vehicle damage is not necessari ly an
indication of whether an airbag should inflate or not.
Since the circumstances will vary considerably between one colli­
sion and another, it is not possible to define a range of vehicle
speeds that w ill cover every possible kind and angle of impact that
will a lways trigger the airbags . Important factors inc lude, for
exa mple, the nature (hard or so ft) of the object which the car h its,
the angle of impact, vehicle speed, etc. The front airbags will also
n ot inflate in side or rear collisions, or in roll -overs .
Al way s rem ember : Airbags wi ll deploy only once, and on ly in certain
kinds of coll isions . Your safety belts are always there to offer protec­
tion in those situat ions in wh ich airbags are not supposed to deploy,
or when they have already deployed; for example, when your vehic le
strikes or is struck by a nother vehicle a fter the first collision.
T his is just one of the reasons why an airbag is a supplementary
restraint and is not a substitute for a sa fety be lt. The airbag system
works most effectively when used with the safety be lts. Therefore ,
always prope rly wea r your safety belt s => page 211 .
& WARNING
Sitting too clo se to the steering wheel or in strument panel will
de crease the effect ivene ss of the airbags and will incr ease the risk
of personal injury in a collision.
• Never sit closer than 10 in ches (25 cm) to the steering wheel or
in strument panel.
• If you c annot sit more than 10 in ches (25 cm ) from the steering
wheel , inve stiga te whether adaptive equipment may be available
to help you reach the pedal s and in crease your se ating dist ance
from the steering wheel.
• If you are unrestra ined , leaning forward , sittin g side ways or out
of position in any way , your risk of injury i s much higher .
• You will also receive serious injur ies and could even be killed if
you are up again st the airba g or too clo se to it when it infl ates -
ev en with an Advanced Airbag .
Controls and equip­ ment Safety first
Vehicle operation
& WAR N IN G ( continued )
• To reduce the ri sk of injury when an airbag inflate s, alw ays
wear safety belt s prope rly~
page 21 5, "S afet y belt s".
• Always make certain that ch ildren age 12 or younger alway s
ride in the rear seat. If children are not p rope rly re str ained , they
may be severely injured or killed when an airbag inflate s.
• Never let children ride unre str ained or impr operly rest rained in
the vehicl e. Adju st the front seat s pr operly .
• Never ride with the b ackrest r eclined .
• Alway s sit a s far as possible from the steering wheel or the
instrument p anel
~ pag e 202.
• Alway s sit upright with your back again st the backre st of your
seat .
• Ne ver pla ce your feet on the instrument panel or on the seat .
Always keep both feet on the floor in front of the seat to help
prevent seriou s injurie s to the leg s and hips if the airbag inflate s.
• Nev er r ecline th e front passenger 's seat to transpo rt obje cts .
Item s can al so mo ve into the area of the side a irbag or the front
airbag during braking or in a sudden m aneuver . Obje cts near the
a irbags can become pro je ctile s and cau se injury when an airbag
inflates .
& WARNING
Airbags that have deployed in a crash must be repla ced.
• U se only original equipment airbags approved by Audi and
in stalled by a trained technician who ha s the neces sary tool s and
diagnostic equipment to properly r epla ce any airb ag in your
vehicle and as sure sy stem effectivenes s in a crash .
• Never perm it salvag ed or re cy cled airb ag s to be i nstall ed in
your vehicle. •
Vehicle care Do-it-yourself service Technical data

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& WARNING (continued)
• Improper installation of child restraints can reduce their effec­
tiveness or even prevent them from providing any protection.
• An improperly installed child restraint can interfere with the
airbag as it deploys and seriously injure or even kill the child -
even with an Advanced Airbag System.
• Always carefully follow the manufacturer's instructions
provided with the child seat or carrier.
• Never place additional items on the seat that can increase the
total weight registered by the weight-sensing mat and can cause injury in a crash.
u
Front airbags
Description of front airbags
The airbag system can provide supplemental protection
to properly restrained front seat occupants.
Fig. 232 Location of
driver airbag: in
steering wheel
-=I
I
-
----~
Fig. 233 Location of
front passenger's
airbag : in the instru­
ment panel
Your vehicle is equipped with an "Advanced Airbag System" in
compliance with United States Federal Motor Vehicle Safety Stan ­
dard (FMVSS) 208 as applicable at the time your vehicle was manu­
factured. The safety belts for the front seats have "pretensioners"
that help to take slack out of the belt system. The pretensioners are
also activated by the electronic control unit for the airbag system .
The front safety belts also have load limiters to help reduce the
forces applied to the body in a crash.
The airbag for the driver is in the steering wheel hub=> fig. 232 and
the airbag for the front passenger is in the instrument panel
=> fig. 233. The general location of the airbags is marked "AIRBAG".
There is a lot you need to know about the airbags in your vehicle. We
urge you to read the detailed information about airbags, safety belts
and child safety in this and the other chapters that make up the
owner's literature. Please be sure to heed the WARNINGS -they are
extremely important for your safety and the safety of your passen ­
gers, especially infants and small children .
& WARNING
Never rely on airbags alone for protection .
• Even when they deploy, airbags provide only supplemental
protection .

-L~A:::..:,: ir:....: b:!..::: a~g L.:: s:1y :...:s::..: t~ e:.: m:...:...:.. ________________________________________________ _
or the lower parts of the body. Front airbags supp leme nt th e thr ee­
poi nt s afet y be lts only in so me front al colli sion s in which th e vehi cle
dece lerat ion is hi gh enou gh to d ep loy the a irba gs.
Front airbags will not deploy:
• if the ignition is switched off when a crash occurs,
• i n sid e collis io ns,
• i n rea r- e nd collisi ons ,
• in ro llovers,
• when th e c ras h de celerat io n measur ed by the a irba g system is
less than the minimum threshold needed for a irbag deployment as
r egi stere d by th e ele ctro nic con trol uni t.
The front passenger airbag also will not deploy :
• when th e fr ont pass enger seat is no t occupi ed,
• when the weight on the front passenger seat a s sensed by the
A dvanced A irbag Syste m indicates tha t the fr ont air bag o n the
passenger side has to be turned off by the e lectronic cont rol unit
(t he PASSENGER AIR BAG OFF li gh t comes o n and s tays o nl.
& WARNING
Sitting in the wrong position can increase the risk of serious injury
in crashes .
• To reduce the risk of injury when the airbags inflate , the driver
and passengers must always sit in an upright position , must not
lean against or place any part of their body too close to the area
where the airbags are located.
• Occupants who are unbelted , out of position or too close to the
airbag can be seriously injured by an airbag as it unfolds with
great force in the blink of an eye
=> page 222.
& WARNING
A child in a rearward -facing child seat installed on the front
passenger seat will be seriously injured and can be killed if the
front airbag inflates - even with an Advanced Airbag System .
• The inflating airbag will hit the child seat or infant carrier with
great force and will smash the child seat and child against the
backrest , center arm rest , door or roof .
• Always install rear-facing child seats on the rear seat .
• If you must install a rearward facing child seat on the front
passenger seat because of exceptional c ircumstances and the
PASSENGER AIR BAG OFF light does not come on and stay on,
i mmed iately install the rear-facing child seat in a rear seating posi­
tion and have the airbag system inspected by your Audi dealer.
& WARNING
Objects between you and the a irbag will increase the risk of injury
in a crash by interfering with the way the airbag unfolds or by
be ing pushed into you as the airbag inflates.
• Never hold things in your hands or on your lap when the vehicle
is in use.
• Never transport items on or in the area of the front passenger
seat. Objects could move into the area of the front airbags during
braking or other sudden maneuvers and become dangerous
projectiles that can cause serious personal injury if the airbags
inflate .
• Never place or attach accessories or other objects (such as cup
holders , telephone brackets , large, heavy or bulky objects) on the
doors , over or near the area marked "AIRBAG " on the steering
wheel , instrument panel , seat backrests or between those areas
and yourself . These objects could cause injury in a crash , espe­
cially when the airbags inflate .
• Never recline the front passenger's seat to transport object s.
Items can also move into the area of the side airbag or the front ..,

llffll,___A_ ir_ b_ a.::g <-- s-- & WARN ING (continued )
• A tight tether or other strap on a rearward-facing child restraint
attached to the front passenger seat c an put too much p res su re
on the weight-sensing mat in the seat and reg ister more weight
than is actually on the seat . The heavier weight registered can
make the system work as though an adult were on the seat and
deploy the Advanced Airbag when it mu st be suppre ssed causing
serious or even fatal injury to the child .
• If, in exceptional circumstances , you must install a forward ­
f ac ing child restraint on the front passenger seat , always move the
seat into its rearmost position in the seat's fore and aft adjust ­
ment range , as far away from the airbag as possible . The ba ckrest
must be adju sted to an upright position. Make sure that the
PASSENGER AIR BAG OFF light comes on and stays on all the time
whenever the ignition is switched on .
& WARNING
• If the PASSENGER AIR BAG OFF light does not go out when an
adult is sitting on the front passenger seat after tak ing the steps
described above, make sure the adult i s properly seated and
restrained at one of the rear seat ing positions .
• Have the airbag system inspected by your Audi dealer before
transporting anyone on the front passenger seat .
[ i ] Tips
If the we ight -sens ing mat in the front passenger seat detects an
e m pty s eat, th e front airbag on the passenge r side wil l be tur ned
off , and the PASSENGER AIR BAG OFF li ght wil l stay on .•
Repair, care and disposal of the airbags
Parts of the airbag system are insta lled at many different places on
yo ur Audi. Ins tal li n g, r em oving, s ervicing o r rep airi ng a part in an area of the vehicle can damage a part of an airbag system and
p revent that sys tem from wo rking pr operly in a c ollisi on.
Th ere are some important th ings you have to know to ma ke sure
that the effectiveness of the system will not be impai red and that
discarded co mponents do no t cause i njury or po llute the enviro n­
ment.
& WARNING
Improper care , servicing and repair procedures can increase the
risk of personal injury and death by preventing an airbag from
deploying when needed or deploying an airbag unexpectedly :
• Never cover , obstruct , or change the steering wheel horn pad
or airbag cover or the instrument panel or modify them in any way.
• Never atta ch any objects su ch as cup holders or telephone
mountings to the surfaces covering the airbag units .
• For cleaning the horn pad or instrument panel , use only a soft ,
dry cloth or one moistened with plain water . Solvents or cleaners
could damage the airbag cover or change the stiffness or strength
of the material so that the airbag cannot deploy and protect prop ­
erly .
• Never repair , adjust, or change any parts of the airbag system .
• All work on the steering wheel , instrument panel , front seats or
electrical system (including the installation of audio equipment ,
cellular telephones and CB radios , etc .I must be performed by a
qualified technician who has the train ing and special equipment
necessary .
• For any work on the airbag system, we strongly recommend
that you see your author ized Audi dealer or qualified workshop .
• Never modify the front bumper or parts of the vehicle body .
• Always make sure that the side airbag can inflate without inter-
ference :
~

___ A_ ir_b _a_ g;:::;_ s--:.. y_s _t _e _m _________________________________________________ _
& WARNING
Changing the vehicle's su spension includ ing use of un approved
tire -rim combinations can change Advanced Airbag performance
and increase the ris k of serious personal injury in a crash .
• Never install suspen sion component s that do not have the
same performance chara cteristics as the components or iginally
installed on your vehicle.
• Never use tire-r im comb inations that have not been approved
by Audi.
& WARNING
Items stored between the safety belt bu ckle and the center
c onsole can cause the sensors in the buc kle to send the wrong
information to the electroni c control module and prevent the
Advanced Airbag System from working properly .
• Alway s make sure that nothing can interfere with the safety
belt buckles and that they are not obstructed .
<£> For the sake of the environment
Undeployed airbag modules a nd pretensioners might be classified
as Pe rchlorate Mat erial -spe cia l han dling may a pply, see
www.dtsc.ca.gov/hazardouswaste/perchlorate. When the vehicle or
par ts o f the restraint syst em i ncludi ng ai rbag modules and saf ety
belts with pretensioners are scrapped, a ll app licab le laws and regu­
latio ns must be observed . Yo ur au thori zed A udi dealer is fam ilia r
with these requirements and we recommend that you have your
dealer perfo rm this serv ice for you .•
Knee airbags
Description of knee airbags
T he airba g sys tem c an prov id e sup plemen tal prot ect ion
t o pro pe rly rest rained fron t seat occ upant s.
0
Fig. 2 36 Drive r's
airba g
The airbag for the driver is located in the instrument panel under ­
neath the steering wheel=> fig. 236, the airbag for the passenger is
at about the same height in the instrument panel und erneath the
glove compartment.
T he knee air bag offe rs addi tio nal pr ote cti on to the d river's a nd
passenger 's knees and upper and lower thigh ar eas as a supple ­
me nt to t he sa fety be lts.
I f the front airbags deploy , the knee airbags also deploy in frontal
collisions above a certain severity=> page
229, "M ore important
thi ngs to kno w about fron t a irba gs" .
B esides their normal safety function, safety belts wor k to help keep
t h e dri ver o r fr on t passeng er in pos itio n in case of a fro ntal col lis ion
so that the airbags can provide protection .
T he airbag system is not a substitute for your safety belt . Rathe r, it
i s part of the overa ll occupa nt res tra int system i n your ve hi cle.
A lwa ys re member that the airbag system can on ly help to protect
you if you a re wearing your safe ty belt and weari ng it properly . T hi s .,,_

1111 Airbag system
----==---=--------------------------------
If the front airbags deploy, the knee airbags also dep loy in frontal
c ollis ions ab ove a cer tai n se ver ity.
When the system is deployed, the airbags start to f ill with a prope l­
lant gas, and inf late between the lower part of the instrument pane l
and t he dr ive r and the lowe r pa rt o f the instrument pane l and t he
front passenger ~ page
229 , fig. 23 4.
Althoug h they are no t a so ft pi llow, t hey can "cushion" th e impac t
and in this way they can he lp to reduce the risk of injury to the lower
e xtr em it ies .
A ll t his takes p lace instantaneously, so fast t hat many people do n't
even realize that the ai rbags have deployed. The airbags a lso inflate
w it h a great deal o f force and it is impor tant for occupan t sa fety t hat
nothing shou ld be in their way when they dep loy.
F u lly infla ted ai rbags i n co mb ination with p roperly worn safety be lts
s low down and limit the occupant's forward movement and he lp to
r ed uce the ris k.•
Important safety instructions on the knee
airbag system
A irb ags ar e onl y supplemen tal r es tra in ts. Alw ays wea r
s af ety be lts cor re ctly and r ide i n a prop er seatin g position.
There is a lo t tha t you a nd your passengers must know a nd do to
help the safet y be lts and airbags to provide supp lemental protec ­
ti on .
& WARNING
An inflating knee airbag can cause serious injury. Wearing safety
belts incorrectly and improper seating positions increase the risk
of serious personal injury and death whenever a vehicle is being
used .
• The airbag system cannot protect you properly if you are
seated too clo se to any of the airbag locations. When adjusting
& WARNING (continued)
their seat positions , it is important that both the driver and the
front passenger keep their upper bodies and knees at the
follow ing min imum safe distances :
- 1 O inches (25 cm) between the chest and the steering
wheel /instrument panel .
- 4 inches (10 cm) between the knees and the lower part of the instrument panel.
• The risk of personal injury increases if you lean forward or to
the side, or if the seat is improperly positioned and you are not
wearing your safety belt. The r isk increases even more should the
airbag deploy .
• Always make sure that the knee airbag can inflate without
interference . Objects between yourself and the airbag can
increase the risk of injury in an accident by interfering w ith the
way the airbag deploys or by being pushed into you as the a irbag
deploys.
-No persons (children) or animals should ride in the footwell
in front of the passenger seat . If the airbag deploys , this can
result in serious or fatal injuries .
- No objects of any kind should be carried in the footwell area
in front of the driver's or passenger's seat. Bulky objects (shop­
ping bags , for example) can hamper or prevent proper deploy ­
ment of the airb ag. Sm all objects can be thrown through the
vehicle if the airbag deploys and injure you or your passengers .
• Make sure there are no cracks , deep scratches or other damage
in the area of the instrument panel where the knee airbags are
located .
• If children are incorrectly seated , their risk of injury increases in
the case of an accident
~ page 245 , "Child Safety". •

-Child Safety -------=---------------------------------------
& WAR NIN G (co ntinued )
• Alw ays in sta ll re ar-facin g child safety s eats on the r ear seat .
• If you m us t in sta ll a rear ward f acing child saf ety s eat on th e
fr ont pa ssenger seat in exceptional circum stan ces and the
PA SSEN GER AIR BAG OFF light do es not come on and sta y on ,
immediately in sta ll the re ar-facing child safety s eat in a rear
s eating po sit ion and ha ve th e airb ag s ystem insp ected immedi ­
atel y by your Audi dea ler .
& WARNING
If, in exceptional circum stance s, you mu st in sta ll a forward -f a cing
c hild re str ain t on th e fr ont p assenger's s eat:
• Always mak e sure the forward -fac ing seat ha s been de signed
a nd ce rt ified by it s m anufa cturer for u se on a fr ont se at w ith a
pa ssenger front and side airbag.
• Always follow the m anufacturer's instru ctions provided w ith
the child safety seat or carr ier.
• Alwa ys mo ve the pa ssenger seat into it s rea rmost positi on in
the seat' s fore and aft adju stment range , as far aw ay from the
ai rbag as possib le bef ore installing the ch ild r estr aint . The ba ck­
re st mu st b e adjusted to an upright po sition.
• Alway s m ake sure that the PASSENGER AIR BAG OFF l ight
c om es on and sta y s on all the time whenever the ignition is
s w it c hed on . •
Advanced front airbag system and children
Your vehicle is equipped with an "Advanced Airbag System" in
complia nce with United States Federa l Motor Vehicle Safety Stan ­
dard (FMVSS) 208 as applicable at the time your vehicle was manu ­
factu red. T
he Advanced Airbag system in your vehicle has been certified to
meet the " low -risk" requirements for 3 and 6 year -old chi ldren on
the passenger side and smal l adults on the driver side . The low risk
deployment criteria are intended to reduce the risk of injury through
interaction with the airbag that can occur, for example, by being too
close to the steering wheel and instrument panel when the airbag
inflates. In addition, the system has been certified to comply with
the "suppression" requirements of the Safety Standard, to turn off
the front airbag for infants up to 12 months who are restrained on
the front passenger seat in child restraints that are listed in the
S tandard.
Even though your vehicle is equipped with an Advanced Airbag
system, all ch ildren, especially those 12 years and younger, should
always ride in the back seat properly restrained for their age and
size . The airbag on the passenger side makes the front seat a poten­
tially dangerous p lace for a child to ride. The front seat is not the
safest p lace for a child in a forward -facing child safety seat. It can be
a very dangerous p lace for an infant or a larger ch ild in a rearward­
facing seat. •
Advanced Airbags and the weight-sensing
mat in the front seat
The Advanced Airbag System in your vehicle detects the presence
of an infant or child in a chi ld restraint on the front passenger seat
using the weight -sensing mat in the seat cushion and the sensor
below the safety belt latch on the front passenger seat that
measures the tension on the safety belt.
The weight -sensing mat measures total weight of the chi ld and the
child safety seat and a child blanket on the front passenger seat . The
weight on the front passenger seat is related to the design of the
child restraint and its "footprint", the size and shape of the bottom
of the child restraint as it sits on the seat . The weight of a child
restraint and its "footprint" vary for different kinds of child ..,.

___ ln_ t _e_ ll-'"ig ...,_ e_ n_t _t_ e_ c_ h _ n_o _ l_o _,.g= y,_ __________________________________________ _
Intelligent technology
Notice about data recorded by
vehicle control modu les
Your vehicle is not equipped with an Event Data Recorder (EDR),
installed by some manufacturers for the express purpose of
capturing data for retrieval after an accident or crash event . EDR's
are sometimes called "crash recorders" .
Some state laws restrict the retrieva l or downloading of data stored
by EDR's that were insta lled in a vehicle for the express purpose of
retrieving data after an accident or crash event without the owner's
consent.
Although your vehicle is not equipped with an EDR, it is equipped
with a number of electronic control modules for various vehicle systems such as, for example, engine function, emission control, as
well as for the airbags and safety belts.
These electronic control modules also record vehicle-related data during norma l vehicle operation for diagnost ic and repair purposes .
The recording capacity of the electronic control modules is limited
to data (no sound is recorded) and only a small amount of data is
actually recorded over a very limited period of time and stored when
a system fault or other condition is sensed by a control unit. Some
of the data then stored may relate to vehicle speed, direction, braking as well as restraint system use and performance in the
event of a crash or other condition . Stored data can only be read and
down loaded with special equipment .•
Electron ic Stabilizat ion Program (ESP)
General =nformation
The ESP improves the vehicle stability.
I~
"' " "'
- -
( ra I 5£ IA I -3, )
Fi g. 256 C ente r
co nso le w it h ES P
swi tch
ESP is designed to he lp you maintain vehic le control in situations
where the car approaches the limits of "grip", especia lly when
accelerating and cornering. ESP reduces the risk of skidding and
improves stabil ity under all road conditions .
T he system operates across the entire speed range in combination
with the ABS system. If the Anti-Lock Brake System (ABS) malfunc­
tions, the ESP wil l also shut down .
How th e sys te m w ork s
The Anti -Lock Brake System (ABS) , Electronic Differential Lock (EDU
and the Anti-Slip Regulation System (ASR) are integrated in the e lec­
tronic stabi lization program . In addition to the data provided by
these functions, the ESP control unit requires additional measure­ ment data provided by high performance sensors . The rotational
speed of the vehic le about its vertical axis, the lateral acce leration
acting on the vehicle, the brake pressure and the steering angle are
a ll measured .

The direction in which the driver wishes to travel is determined with
t he aid of the steering angle and vehicle speed and is continua lly
compared with the actual behavior of the vehicle. If the two do not
match, for example, when the vehic le starts hydrop laning on a wet
road, ESP will automatically brake the appropriate whee l to correct
the prob lem.
The vehicle is then stab ilized by the forces acting on the whee l
during braking. If the vehicle is oversteering (rear tends to skid out
of the turn), the brakes are mainly app lied on the wheel that is on
the outside of the curve. In the case of a vehicle that is understeering
(tendency to sl ide out of the curve), the brakes are applied at the
rear wheel that is on the inside of the curve . An acoustic signal indi­
cates when ESP brake application cuts in
~ & .
The system operates across the entire speed range in combination
with the ABS system
~ page 274 . If the Anti -Lock Brake System
(ABS) malfunctions, the ESP wi ll be out of action as well.
Ac tivat ion
When you turn on the eng ine, ESP will automatically be activated
and will perform a self -test.
The system can be activated or deactiva ted by pressing the button
~ page 270, fig. 256. The warning light comes on when the system
is switched off
~ page 18.
Normally , the ESP should always be on, however, it may be advanta­
geous to turn off the system in certain special cases when some
degree of wheel spin is desired such as :
• when driving with snow chains
• when driving in deep snow or on a loose surface (to allow the
wheels to dig in to reach firm ground)
• when trying to "rock" the vehicle free when it has beco me stuck.
T he system should be reactivated once you are no longer in such
situations .
Both the ABS and EDS systems are still functioning even if the ESP
is switched off .
Controls and equip­
ment Safety first Vehicle operation
In
te llig ent tec hn olo gy
& WARNING
The Ele ctron ic St abiliz ation Progr am i s ne ve rt h el ess s ubject to the
laws of ph ysics. It i s particularl y important t o pay attention t o th is
f ac t on wet an d slipp ery road s. It i s th ere fore important that you
alway s adapt your driving to the condition of the road and traffic
c onditio ns. Do n ot allow the in crease d sa fety p ro vi ded by t he El ec­
tronic Stabiliz ation Program sy stem to lu ll you into a ccepting
a dditional safety ri sk s.
c
Electronic differential lock (EDL)
The electronic differential lock monitors the rotation al
s p eed of the drive wheels.
G en era l not es
The elect ronic differential lock (EDU helps the car to start moving,
accelerate and c limb a gradient on surfaces providing poor or
a lmost no grip . Without EDL , this would be difficult, if not impos ­
s ib le.
How the system works
The EDL operates automatical ly. It monitors the rotational speed of
the drive wheels on an axle with the he lp of the ABS sensors
~ page 274. If a noticeable difference in rotational speed between
the drive wheels on one axle is detected (e.g. on slippery ground on
one side), the spinning w heel is braked, thereby transferring power
to the other drive wheel or wheels (all -whee l drivel. This is done up
to a speed of about 60 mph (100 km/h) . Noises from the brake
system signal that wheel spin is being control led .
Dri ving off
When driving off, always be sur e to ke ep road conditions in mind as
you accelerate. I f one drive wheel spins because it is on a surface
with less grip, gradual ly increase the pressure on the accelera tor
pedal unt il the car star ts to
move . The whee l less able to t ra nsfer
power spins. _.,
Vehicle care Do-it-yourself service Technical data

until the vehicle has braked to the required speed. The brake assis­
tant switches itself off as soon as you release the brake pedal.
The brake assistant will not be operative if there is a malfunction in
the ABS.
& WARNING
Please remember that the accident risk always increases if you
drive too fast, especially in corners or on a slippery road, or if you
follow the vehicle ahead of you too closely. Increased risk of an
accident cannot be compensated for even by the brake assistant,
so always maintain a safe speed. •
Servotronic® -advanced power
steering system
The power steering systems uses the power of the
running engine to allow precise steering with little effort.
The advanced Servotronic ® power steering system senses the road
speed and electronically adjusts power assistance to provide
comfortable and safe steering response exactly matched to the
vehicle speed.
Power steering will not work if the engine is off. As a result, the
steering whee l wil l be hard to turn.
The power steering fluid level is checked during the scheduled
maintenance services.
0 Note
If there is an electronic malfunction, servotronic will sti ll function
like a conventional power steering system, providing a constant
steering support force that is no longer proportionate to the vehicle
speed. This is most noticeable when turning the steering whee l at
Controls and equip­
ment Safety first Vehicle operation
Intelligent technology
low speeds (for examp
le when parking), -more effort will be
requ ired than usual.
• Be aware of the different than usual steering response and
adjust your steering force accordingly .
• Have the problem checked and set right by an Audi dealer as
soon as possible.
[ i ] Tips
• When the engine is running, never hold the steering whee l
turned all the way to the right or to the left for longer than 15
seconds. The power steering pump will overheat the hydraulic fluid
if you keep holding the steering whee l turned a ll the way. This is
likely to damage the power steering system.
• If the power steering system shou ld fail entire ly, or if the engine
is not running (for examp le, while being towed), you will still be able
to steer the vehicle . However,
considerably more effort will be
required to do so.
• If the power steering system shou ld have a leak, or is not func ­
t ioning properly, contact your authorized Audi dealer immediately.
• The power steering system requires a special ly formulated
hydraulic fluid. The power steering reservoir is the one located most
forward on the left side of the engine compartment=>
page 310. The
correct fluid level in the reservoir is important for proper func­
tioning of the power steering .•
Driving with your q attro®
With All Wheel Drive, all four wheels are driven.
General information
With All Whee l Drive, power is distributed to all four wheels. This
happens automatically depending on your dr iving style and the
road conditions at the time. See also=>
page 271, "Electronic differ ­
entia l lock (EDU".
Vehicle care Do-it-yourself service Technical data