ABS AUDI S6 2008 User Guide

- Make sure that your passengers also buckle up and prop­
erly wear their safety belts.
- Protect children with a child restraint system appropriate
for the size and age.
The warning light 4,-in the instrument cluster lights up when the
ignition is switched on as a reminder to fasten the safety belts . In
addition , you will hear a warning tone .
After the ignition is switched on, the warning light in the instrument cluster will always come on for about 6 seconds and if the driver has
not fastened the safety belt , a warning tone will also sound for
about 6 seconds. As soon as the driver has fastened the safety belt,
the warning tone will stop and the warning ligh t will go out .
If the driver or front seat passenger have not buckled -up within
about 10 seconds after the warning tone has stopped and the
vehicle is moving faster than about 15 mph, the warning tone will
sound again for about 6 seconds and then stop for 24 seconds and
then repeat this reminder sequence for a maximum of 2 minutes . At
speeds below 5 mph, the warning tone will not sound.
Fasten your safety belt and make sure that your passengers also
properly put on their safety belts.
& WARNING
• Safety belts are the single most effective means available to
reduce the risk of serious injury and death in automobile acci­
dents. For your protection and that of your passengers, always
correctly wear safety belts when the vehicle is moving.
• Failure to pay attention to the warning light that come on,
could lead to personal injury. •
Safety first
Safety belts
Why safety belts?
Frontal collisions and the law of physics
Frontal crashes create very strong forces for people riding
in vehicles.
Fig . 193 Unbelted
occupants in a vehicle
heading for a wall
Fig. 194 The vehicle
crashes into the wall
The physical principles are simple. Both the vehicle and the passen­
gers possess energy which varies with vehicle speed and body
weight . Engineers call this energy "kinetic energy."
The higher the speed of the vehicle and the greater the vehicle's
weight, the more energy that has to be "absorbed" in the crash.
Vehicle speed is the most significant factor . If the speed doubles
from 15 to 30 mph (25 to 50 km/h) , the energy increases 4 times!
~
Vehicle care I I Technical data

Safety belts protect
People think it's possible to use the hands to brace the
body in a minor collision . It's simply not true!
Fig . 19 7 Driv er is
co rre ctl y r est rai ned in
a sud den braki ng
m an eu ver
Safety belts used pr operly can make a b ig di fference . Safety belts
help to keep passengers in their seats, gradually reduce energy
levels app lied to the body in an accident, and help prevent the
uncontrolled movemen t that can cause serious injuries . In addition ,
safety belts reduce the danger of being thrown out of the vehicle .
Safety belts attach passengers to the car and give them the benefit
of being s lowed down more gent ly or "softly" through the "give" in
the safety belts, crush zones and other safety features engineered into today's vehicles. By "absorbing" the kinetic energy over a
longer period of time, the safety belts make the forces on the body
more "tolerable" and less likely to cause injury .
Although these examples are based on a fro ntal co llision, sa fety
belts can also substantially reduce the risk of injury in other kinds
of crashes . So, whether you're on a long trip or just going to the
corner s tore , a lways buckle up and make sure others do , too . Acci­
dent statistics show that vehic le occupants properly wearing safety
belts have a lower risk of being injured and a much better chance o f
surviving an accident. Properly using safety belts also greatly
increases the ability of the supplemen tal airbags to do their job i n a
collision . For this reason, wearing a safety belt is legally required in
most coun tries including much of the United States and Canada.
Safety first
Safety b elts
Although your Audi is equipped with airbags, you sti ll have to wear
t he safety belts provided. Front airbags, for examp le, are activa ted
only in some fronta l collisions . The front airbags are not ac tiva ted in
a ll fron tal collisions, in side and rear collisions, in roll overs o r in
cases where there is not enough deceleration through impact to the
front of the vehicle. The same goes for the other airbag systems in
your Audi. So, always wear your safety belt and make sure every­
body in your vehic le is properly restrained! •
Important safety instructions about safety
belts
Safety belts must always be correctly posi tioned across
the strongest bones of your body.
Always wear safety be lts as illustrated and described in
th is chapter .
Mak e su re that your s afety belts ar e always r eady for use
a n d a re not damaged .
& WARNING
Not wearing safety belt s or wear ing them improperl y increases
the ri sk of ser ious per so nal injury a nd de ath . S afety belt s ca n work
only when used corre ctl y.
• Alway s fasten your safety belts correctly before dri ving off and
make sure all passengers are correctly restrained .
• For ma ximum prote ction , safety belts mu st always be posi ­
tioned properly on the body .
• Never str ap more than one pe rson, includ ing small ch ildr en ,
into any belt .
• Never pla ce a safety belt over a child sitting on your lap .
• Alway s keep feet in the footwell in front of the seat while the
vehicle is being driven . .,
Vehicle care
I I irechnical data

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& WA RN ING (co ntinued)
• Airb ag work mo st effectively when u sed with prope rly worn
s afety belts.
• Therefore , alwa ys wear your safety be lt s and make sure that
ev erybod y i n yo ur vehi cle is properly re str ained.
& WARNING
A pe rson on the front pa ssen ger s eat , e spe cially inf ants and small
c hildren , w ill re ceive s eriou s injurie s and can ev en be killed by
being too cl ose to the airbag whe n it infl ates .
• Although the Advan ced Airba g System in your vehicle i s
de signed t o tu rn off the front p assenger airb ag i f a n inf ant or a
s mall child i s on the front pa ssenger seat , nobod y can absolut ely
gu ara nt ee that deployment under these spe cial con ditio ns is
impo ssible in all conc eivable situations that m ay happen during
the useful l ife of your vehic le.
• The Adv anced Airbag Sy stem will deploy in a ccordance with
the "lo w risk" opti on u nder th e U.S. Feder al Stand ard if a child t hat
i s heavier than th e typi cal on e-year old child i s on the front
p asse nger seat and the other conditi ons for airb ag dep loym ent
are met.
• Acc ident stat istics have shown that children are gener ally s afe r
in the rear seat ar ea than in the front seating po sit ion .
• Fo r their o wn safet y, all children , espe cially 12 yea rs and
younger , should always r ide in the back properly restrained for
their age and siz e. •
Advanced front airbag system
Your vehicle is equipped with a front Advanced Airbag System in
compliance with United States Federal Motor Veh icle Sa fety Stan ­
dard 208 as applicab le at the time your vehicle was manufactured.
Controls and equip­ ment Safety first Vehicle operation The front Advanced Airbag System supplements the safety belts to
provide additional protection for the driver's and front passenger's
heads and upper bodies in fronta l crashes. The airbags inflate only
in frontal impacts when the vehic le dece leration is high enough.
The front Advanced Airbag System for the front seat occupants is not a substitute for your safety belts. Rather, it is part of the overa ll
occupant restraint system in your vehicle. A lways remember that
the airbag system can only help to protect you, if you are sitting
upright, wear ing your safety belt and wearing it properly . This is why
you and your passengers must a lways be properly restrained, not
just because the law requires you to be .
The Advanced A irbag System in your vehicle has been certified to
meet the " low risk" requirements for 3 and 6 year-o ld children on the
passenger side and very small adults on the driver side. The low risk
deployment criteria are intended to he lp reduce the risk of injury
through interact ion wi th the front a irbag that can occur, for
examp le, by being too close to the steering whee l 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 12 months old and younger who are restrained on the front passenger seat in child restraints that are
listed in the Standard:::::,
page 236, "Child restraints and Advanced
Airbags".
"Suppression" requires the front ai rbag on the passenger side to be
turned off if:
• a child up to about one year of age is restrained on the front
passenger seat in one of the rear-facing or forward -facing infant
restraints listed in Federal Motor Vehicle Safety Standard 208 with
wh ich the Advanced Airbag System in your vehicle was certif ied. For
a listing of the child restraints that were used to certify your
vehicle's compliance with the US Safety Standard:::::,
page 236,
• weight less than a threshold leve l stored in the control unit is
detec ted on the front passenger sea t. .._
Vehicle care Do-it-yourself service Technical data

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When a person is detected on the front passenger seat, weighing
m ore tha n the to tal weigh t of a c hild that is ab out 1 year old
restra ined in one of the rear -fac ing or forward -facing infant
r es traints (listed in Fede ra l M oto r Vehicle Safe ty S ta ndard
208 with
which the Advanced Airba g System in your ve hic le was certified),
the fro nt airbag on the pas se nge r si de may o r may not dep loy .
The
PASSENGER AIR BAG OFF li gh t com es o n when the elect ro ni c
contro l unit detects a total weight on the front passenger seat that
requ ires th e front ai rbag to be tur ned off. If th e
PASSENGER AIR BAG
OFF
light does not come on, the front airbag on the passenger side
h as not been tu rned off by the c ontrol unit and can depl oy if the
control unit senses an impact that meets the conditions stored in its memo ry .
If t he to tal we ight on the fro nt passen ge r seat is more t han t hat of
a typical
1 year -old, but less than the weight of a small adult, the
fro nt a irba g on t he passen ger side may dep loy (the
PASSENGER AIR
BAG OFF
li ght does not come onl.
For example, the airbag may deploy if:
• a small ch ild that is heav ie r th a n a typ ical 1 yea r-old ch ild is o n
the front passenger seat (regardless of whether the child is in one
o f th e ch ild sa fety seats listed=>
page 236),
• a ch ild wh o ha s ou tg rown chi ld re strain ts is on the fron t
passen ger seat.
If the front passenge r airbag is turned off, the
PASSENGER AIR BAG
OFF
lig ht in the ce nter of t he inst rument panel wi ll co me on a nd stay
on.
The fron t airb ag o n the passenger side may
not deploy (the
PASSENGER AIR BAG OFF lig ht does not i llu m ina te and s ta y lit) i f:
• a small adu lt or teenager is on the front passenger seat
• a passenger who is no t sitt ing up rig ht with the ir back aga inst a
non -reclined bac krest with their feet on the vehicle f loor in front of
t h e seat is on th e fro nt pass enger se at.
If the front passenger airbag deploys, the Federa l Standard requires
t he a irbag to m eet th e "low ri sk" deploy ment criter ia to he lp reduce the risk of injury through interaction with the airbag. "
Low risk"
d eployme nt occ urs in those cras hes that ta ke place a t lower de ce l­
e rations as defined in the electron ic contro l unit .=:>
page 223
Always remember : Even though your vehicle is equipped with
A dva nced Air bags , th e sa fes t place fo r chi ldren is properly
r estra ined on the back seat. Please be sure to read the important
i nf orm atio n in t he sect ions t hat follow and b e sur e to hee d all of the
WARN INGS.
& WARNING
To reduce the risk of injury when an airbag inflates, always wear
safety belts properly.
• If you are unrestrained, leaning forward , sitting sideways or out
of posit ion in any way, your risk of injury is much higher.
• You will also receive serious injuries and could even be killed if
you are up against the airbag or too close to it when it inflates -
even with an Advanced Airbag=:>
page 212.
& WARNING
A child in a rearward -facing child safety 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 .
• Although the Advanced Airbag System in your vehicle is
de signed to turn off the front airbag when a rearward -facing child
restraint has been installed on the front passenger seat , nobody
can absolutely guarantee that deployment is impossible in all
conceivable situations that may happen dur ing the useful life of
your vehicle.
• The inflating airbag will hit the child safety seat or infant
carrier with great force and will smash the child safety seat and
c hild against the backrest , center arm rest , door , or roof .
• Always install rearward -facing child restraints in the back seat . ..,.

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& W ARNING (continued )
• Always make sure that the side airbag can inflate without inter­
ference :
- Never install seat covers or replacement upholstery over the
front seatbacks that have not been specifically approved by
Audi.
- Never use additional seat cushions that cover the areas
where the side airbags inflate.
- Damage to the or iginal seat covers or to the seam in the area
of the side airbag module must always be repaired immedi ­
ately by an authorized Audi dealer.
• The airbag system can be activated only once. After an airbag
has inf lated , it must be replaced by an authorized Audi dealer or
qualified technician who has the technical information , training
and special equipment necessary .
• The airbag system can be deployed only once . After an airbag
has been deployed, it must be replaced with new replacement
parts designed and approved especially for your Audi model
version. Replacement of complete airbag systems or airbag
components must be performed by qualified workshops only .
Make sure that any airbag service action is entered in you r Audi
Maintenance
& Warranty booklet under AIRBAG REPLACEMENT
RECORD .
• In accidents when an airbag is deployed , the vehicle battery
separates the alternator and the starter from the vehicle electrical
system for safety reasons with a pyrotechnic circuit interrupter.
-Work on the pyrotechnic circuit interrupter must only be
performed by a qualified dealer -risk of an accident!
- If the vehi cle or the circuit interrupter is scrapped, all appli ­
c able safety precautions must be followed . •
Controls and equip­ ment Safety first
Vehicle operation
Other things that can affect Advanced Airbag
performance
Changing the veh ic le 's suspen sion system can change the way that
the Adva n ced Air bag Syst em perfor ms in a crash . For e xamp le,
u sing tire -r im co mbinations not ap proved by Audi , lowering the
v ehi cle, c hang ing the s tiff ness of the susp ens ion, inclu d in g t he
springs, s uspension struts, shock absorbers etc. can change the
fo rce s t hat ar e meas ured by t he airbag sens ors and sent t o the e lec­
tronic control unit. Some suspens ion changes can, for example,
i nc rease t he for ce leve ls mea sured by th e sen sors and make th e
airbag system dep loy in crash es in wh ich it wou ld not deploy if the
ch anges had no t been m ade. O th er ki nds of change s may red uce
the force levels measured by t he sensors and prevent t he airba g
fr om d eploying when it shoul d.
T he se nso rs in t he safety b elt b uckle for the driver a nd front
passenger seat te ll the electronic control module if the safety belt is
l a tc h e d or n ot. If t he safet y bel t is bei ng use d, the front ai rbag w ill
dep lo y at a s lightly hig her rate of veh ic le dece leration than
if the
safe ty belt i s not be ing used . The re fo re, in a pa rticu la r colli sion, i t is
poss ible that an airbag will not deploy at a s eating position where
t he safe ty be lt is b ein g us ed b ut will infl ate a t th e po siti on where the
safety belt is not being used. It is important that nothi ng int erfer e
with the safety belt b uckl es so that the sens ors can send the correct
i n formation about safety belt use to the electronic control u nit.
& WARNING
Chang ing the vehicle's suspension includ ing use of unapproved
tire -rim combinations can change Advanced Airbag performance
and increase the risk of serious personal injury in a crash.
• Never install suspension components that do not have the
same performance characteristics as the components originally
installed on your vehicle.
• Never use tire-rim combinations that have not been approved
by Audi. ...
Vehicle care Do-it-yourself service Technical data

___ C_h_ i_ ld _ S_ a_ f_ e_ t_y ____________________________________________ _
child is available. In these exceptional situations, the use of a lap
belt is better than permitting the child to remain total ly unre ­
strained . But remember: a lap belt cannot provide the same level of
protection as a proper child restraint or a three -point lap and
shoulder belt if the child is big enough . Also, using a lap belt for
younger child ren, who should be using a chi ld restraint, may violate
laws in your state or Province.
Never use a lap belt a lone to restrain a chi ld that weighs less than
about 80 lbs (36 kg) and who is less than 4'9" tall. A lways remembe r
that chi ldren do not have the pronounced pelvic structure required
for the proper function of lap belts. If a lap belt is only res traint
system available , then the child's safety absolutely requires that the
lap be lt be fastened snug ly and as low as possible around the pe lvis
let a lap belt pass over the chi ld's stomach or abdomen .
& WARNING
Using wrong child re straints or improperly in stalled child
restr aint s can cause serious personal injury or death in a cr ash .
• Failure to properly route safety belts over a child's body will
c au se severe injurie s in a crash . The lap belt portion of the three
point belt as well as any lap belt alone must alway s pass as low as
p os sible acros s the pelvis, n ever ov er the stoma ch or abdomen.
• An impr ope rly worn s afet y belt will not pr ovide the best prote c­
tion in a cra sh and may cau se seriou s personal injury . Alway s
make sure that children and other veh icle o ccupant s properl y
wear available r estraint system s. Carefully follow the in struction s
p ro vi ded by the manufa cturer s of child re straint s.•
Installing a child safety seat
Securing a child safety seat using a safety
belt
S afety belts for the rear seats and the fr ont passenger can
be locked with the c onvertible locking retr actor to pr op­
erly secure child safety seats.
The safety belts emergency locking retractors for the rear seats
safety be lts and for the front passenge r's seat safety belt have a
convertible locking retractor for child restraints . The safety belt
must be locked so that belt webbing cannot unreel. The retractor
can be activated to lock the safety be lt and prevent the safety belt
webbing from loosen ing up dur ing normal driving. A child safety
seat can only b e properly instal led when the safety belt is locked so
t hat the child and chi ld safety seat w ill stay i n place .
Always remember: Even though your vehicle is equipped with an
Advanced Airbag system, al l children, especially those 12 years and
younger , shou ld always ride in the back seat proper ly restrained for
their age and size.
& WARNING
Improperly in stalled child safety seat s increa se the risk of serious
pe rsonal injury and death in a collision.
• Alway s ma ke sure that the safety belt retractor is locked when
i nstall ing a child safety seat . An unlo cked safety be lt retra ctor
cannot hold the child safety seat in pla ce during normal driving or
in a cra sh .
• Alway s buckle the child saf ety seat firml y in pl ace even if a
c hild i s not s itting in it. A loo se child saf ety seat can fl y around
during a sudden stop or in a colli sion
• Alway s make sure th at the rear se at backre st to which the
center rear s afety belt i s attached is securely latched whenever
the rear cent er safety belt is being u sed to se cur e a ch ild re straint . .,_

llffl __ 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.
(
Fi g. 225 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, vehicle acce leration in
the fore-and-aft and lateral directions, the brake pressure and the steering angle are al l 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 262 . If the Anti -Lock Brake System
(ABS) malfunctions, the ESP wi ll be out of action as well.
Ac tivat ing
When you turn on the eng ine, ESP will automatically be activated
and will perform a se lf -test . As soon as the test is comp leted, the
system is in norma l operating mode.
You can activate a deactivated ESP or deactivated ESP/ASR if required by pressing the~
page 258, fig. 225 button . When they are
activated, the message
E S P/AS R on appears briefly in the display.
D eactiv ating
The ESP should normally be activated al l the time . If necessary, you
can deactivate An ti- Slip Regulation (ASR) or the E lectronic Stabiliza ­
tion Program (ESP) by pressing the button~
page 258, fig. 225.
• Dea ct ivat ing A SR: Tap the button . In certain exceptional situa ­
tions (e.g. driving with t ire chains) , the Anti-Sl ip Regulation (ASR)
can be deactivated ~
page 260. The message ASR off appears in the
display as we ll.
• Dea ctiv at ing E SP/ASR Press the button for more than 3 seconds.
With the ESP/ASR deactivated, the ESP check light comes on, see
Controls and equip­
ment Safety first Vehicle operation
In
te llig ent tec hn olo gy
~ page 19 . The message ES P sw itched off appears in the disp lay as
we ll.
& WARNING
The Electroni c Stabili zation Program i s never thele ss subject to the
la ws o f physics . It is p articularl y import ant t o pay a ttent ion t o th is
f a ct on wet and slippery road s. It is ther efore important tha t y ou
a lw ays a dapt your dr iving to the c ondit ion of th e ro ad and t raffi c
c ondition s. Do n ot allow the inc rea sed safety pro vided b y th e Elec ­
tr on ic S ta bili zatio n Pr ogram sys tem to lull you in to acc epting
add iti onal safet y risk s. C
Electronic differential tock (EDL)
The electronic differential lock monitors the rotational
speed of the drive wheels.
Gener al note s
The electronic differential lock (EDU helps the car to start moving,
accelerate and c limb a gradient on surfaces providing poor or
almost no grip . Without EDL, this would be difficult, if not impos ­
sib le .
How th e sys te m wo rk s
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 262 . 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 wheel is braked, thereby transferring power
to the other drive wheel or whee ls (a ll -whee l drive) . Th is 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 .
Dr iving off
When driving off , always be sure to keep road conditions in mind as
you accelerate. If one drive wheel spins because it is on a surface
Iii>
•
Vehicle care Do-it-yourself service Technical data

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with less grip, gradually increase the pressure on the accelerator
pedal until the car starts to move.
Overheating of brakes
To prevent the disc brake of the braked wheel from overheating if
subjected to excessive loads on this wheel, the EDL cuts out tempo ­
rarily. The vehicle remains operational and behaves in the same way
as a vehicle without EDL.
As soon as the brake has cooled down, EDL switches on again auto ­
matically.
& WARNING
• When accelerating on slippery surfaces, such as on ice or snow,
always be careful when depressing the accelerator pedal. Even
with the EDL working, the drive wheels can spin and reduce your
ability to control your car. Risk of crash!
• The increased safety afforded by EDL does not mean that you
can take safety risks. Always adapt your driving style to the road
conditions and traffic situation.
[ i] Tips
If a fault occurs in the ABS, the EDL is also not functioning. This is
indicated by the ABS warning light=>
page 22. •
Ant"-Slip Regulation System (ASR)
The Anti-Slip Regulation System prevents the driven
wheels from spinning when the car is accelerating.
General notes
The Anti-Slip Regulation System (ASR) is integrated in the electronic
stabilization program (ESP). When the vehicle starts up and acceler ­
ates, the wheels are prevented from spinning by adjusting the engine power to match the amount of grip available from the road
surface.
How the system works
ASR
performs automatically, i.e. without the driver's intervention.
With the aid of the ABS sensors=>
page 262, ASR monitors the
speed of the driven wheels. If the wheels start to spin, the engine
torque is reduced automatically until the tires find enough grip to
lock onto the road surface. The system is active across the entire
speed range.
Th e ASR works in conjunction with the ABS. If a malfunction should
occur in the ABS, the ASR will also be out of action.
Activating
The ESP is automatically activated when the engine is started and it
performs a self -test . You can activate a deactivated ASR if required
by pressing the =>
page 258, fig. 225 button . When it is activated,
the message
ESP/ASR on appears briefly in the display. Vehicles
with front-wheel drive a deactivated ASR automatically re-activates
itself at a speed of 40 mph (70 km/h) .
Deactivating
You can deactivate the ASR if required by pressing the button (for
less than 3 seconds)=>
page 258, fig. 225. With the ASR deactivated,
the ESP check light comes on, see=>
page 19. The message ASR off
appears in the display as well. On vehicles with front-wheel drive:
deactivation is possible only up to 30 mph (50 km/h) for safety
reasons . Vehicles with all -wheel drive: the ASR can be deactivated
at any speed .
The ASR should normally be activated all the time. Only in certain
exceptional situations when some slip is desirable does it make
sense to deactivate the ASR. Examples:
• when driving with tire chains
• when driving in deep snow or on loose ground and
• when rocking the vehicle loose after it has become stuck .

___ ln_ t _e_ ll-'"ig ...,_ e_ n_t _t_ e_ c_ h _ n_o _ l_o _,.g= y,_ __________________________________________ _
& WARN ING (continued )
• Before des cending a steep grade , reduce speed and shift trans­
mission into a lower gear or lower dr iving range. D o not r ide the
brakes or hold the pedal down too long or too often . This could
c au se the brake s to get hot and dimin ish braking effi ciency.
• Do not "ride the brakes " by resting your foot on the pedal when
you do not intend to b rake. This may cause the brakes to overheat ,
premature wear and in crea sed stopping distan ce.
• Under certain climat ic and oper ating condit ion s s uch as
passing through water, driving in heavy rain or after washing the
vehicle , the effectiveness of the brakes can be reduced. In winter ,
ice c an a ccumulate on the brake pads , linings , discs and drums .
Carefully apply brakes fo r a test. Brakes will dry and ice coatings
will be cleaned off after a few careful brake applications .
• Driving for an e xtended pe riod of time on salt-covered road s
without using your brakes can also affect braking efficiency . Clean
off accumulated salt coating from brake disc s and pads with a few
careful brake applications .
• If you damage the front spoile r, or if you install a different
spoiler , be sure the air flow to the front brakes is not obstructed .
Otherwise the brake system could overheat reducing the effective ­
ness of the entire br ake system .
• Failure of one brake circuit will impair the braking capability
resulting in an increased stopping distance . Avo id driving the
vehicle and have it towed to the nearest Audi dealer or qualified
workshop .
u
Brake booster
T he brake boo ster ad ds e xtra bra kin g pow er.
T he brake booster works with vacuum pressure which is created
only when t he en gine is run ning~ &.
& WARNING
• Never let the vehi cle roll to a stop with the engine shut off .
• If the brake boo ster is not working, for example when towing
your vehicle , or because the brake booster has somehow been
damaged, the brake pedal must be pre ssed considerably harder to
make up for the lack of booster assistance . •
Functioning of Anti-Lock Brake System (ABS)
-- --
ABS preven ts the wheels from l ocking up und er bra kin g.
T he ABS contributes effectively to vehicle contro l since it prevents
th e w hee ls fr om lo cking when the brakes a re app lied . T hi s m ea ns
that the vehicle remains steerable and is less l ikely to skid.
With ABS you do not need to pump the brake . Just hold the brake
pedal down .
H owever, do not expect the AB S to shorten braking distance under
all circu ms tances. When drivi ng on grave l or on newly fa lle n sn ow
on top of icy surfaces, braking distance may be even longer, there ­
f o re, unde r these c ircums ta nces , it is es pecially imp ortant th at you
drive slow ly and with great care .
How the ABS system works
An automatic check is made when a speed of about 4 mph (6 km/h)
i s r eac hed . W he n th is happens, a pumping n oise ca n be heard.
I f a n indiv idual wheel be gins to rotat e too slowly in relation to
vehic le speed and tends to lock, the ABS automatically reduces
brake pressur e to p revent that whee l from loc king .
T his automatic adjustment p rocess will cause a slight vibration of
t he brake peda l a nd some noi ses t o a le rt yo u th at ve hicle speed
must be adapted to ex isting road and traffic conditions. .,