2012 AUDI A8 Owners Manual

These new performance requirements make a
tether necessary on most new chi ld safety
seats.
.&_ WARNING
Improper installation of child restraints
will increase the risk of injury and death in a crash.
- Always follow the instructions provided
by the manufacturer of the ch ild re­
straint you intend to install in your Audi.
- Improper use of c hild restraint anchors
(including tether anchors) can lead to in­
jury in a collision. The anchors are de­
signed to withstand only those loads im­
posed by correctly fitted ch ild restraints.
- Never mount two chi ld restraint systems
on one LATCH lower anc hor po int.
- Never attach two child restraint systems
to one tethe r strap or tether anchorage.
- Never attach a tether strap to a tie-down
hook in the luggage compartment .
- Never use child restraint tether ancho­
rages to secure safety belts or other
k inds of occ upant restra ints.
- Never secure or attach any luggage or other items to the LATCH lowe r ancho­
rages or to th e tethe r ancho rs.
- If a tether or other strap is used to at­ tach a child restraint to the front passen­
ger seat, make sure that it is not so
t ight, that it causes the weight -sensi ng
mat to measu re mo re weight than is ac­
t u a lly on the seat.
- T he he avier weig ht reg iste red ca n make
the Advanced Airbag Sys tem work as
tho ugh an adult were on the seat and de ­
ploy the Advanced Airbag w hen it must
be s uppressed causing serious or
even
fatal injury to the child .
- If you must install a rearward facing
child safety seat on the front passenger
seat because of exceptional circumstan­
ces and the
PASS ENG ER AIR BAG OFF
light does not come on and stay on, im­
med iate ly install the rear-facing chi ld
safety seat in a rear seating posit ion a nd
-
Child S afety 183
have the airbag system inspected by your
Aud i dealer.
Installing the upper tether strap on the
anchorage
F ig . 1 66 Tet her st rap: proper ro uting and mounting
Installing the t eth er strap
.. Release or deploy the tether strap on the
child restraint according to the child re­
straint manufacturer's instructions.
.. Guide the upper tether strap
unde r the rear
head restra int
qfig. 166 (ra ise the head re­
straint if necessa ry) .
.. Center seating position*: Guide the upper
tether strap over the rear head restra int .
.. Til t the recess flap up to expose the an chor
bra cket.
.. Attach the tether strap anchorage hook into
the opening of the tether ancho rage .
.. Pull on the tether strap hook so that the
spring catch of the hook engages .
.. Tighten the tether strap firmly follow ing
the child restraint manufacturer's instruc­
tions .
Relea sing the tether strap
.. Loosen the tension following the child re­
straint manufacturer's instructions.
.. Depress the spring catch on the hook and
release it from the anchorage .
Q) Note
If you leave the child restraint w ith the
tether strap firmly installed for several
days, t his could leave a mark on the up­
ho lstery o n the seat cushion and backrest

184 Child Saf ety
in the area whe re the tether strap was in­
stalled. The upholstery would a lso be per­
manently stretched around the tether
strap. This applies especially to leather
seats.
Using tether straps on rearward-facing
child restraints
Currently , few rear-facing child rest rain t sys­
tems come with a tether. P lease read and
heed the child restraint system manufactur­
er's instructions carefully to determine how to
properly install the tether .
A WARNING
A child in a rearward -facing child safety
seat installed on the front passenger seat
w ill be seriously injured and can be k illed if
the front a irbag inflates -even with an Ad ­
vanced Airbag System .
- The inflating a irbag will hit the child
safety seat or infant carrier with great
force and w ill smash the ch ild safety seat
and child against the backrest, cente r
armrest, or door.
- A tight tet her or ot her st rap on a rear­
wa rd-fa cing child restra int attached to
the front p assenger sea t ca n put too
much pressure on the weight -ma t in the
seat and register a heavier weight in the
Advanced Airbag System. The heavier
we ight registered can make the system
work as though an adu lt were on the seat
and dep loy the Advanced Airbag when it
must be suppressed ca using se rious or
even fatal injury to the child .
- If you must install a rearward facing child safety seat on the front passenger
seat because of exceptional circ umstan­
c es and the
PASSENGER AIR BAG OFF
ligh t does no t come on and stay on, im­
med iately install the rear -facing child
safety seat in a rear seating position and
have the a irbag system inspected by yo ur
Audi dealer.
Additional Information
Sources of information about child
restraints and their use
T he re a re a number o f sou rces of add itiona l
information abo ut child rest raint se lection, in ­
sta llation and use:
N HT SA advises that the bes t ch ild safety seat
is the one that fits your ch ild an d fits in you r
vehicle, and that yo u will use correct ly and
consistently .
T ry before yo u buy!
U.S National Highway Traffic Safety Admin ­
i s tration
T el.: 1-888-3 27-4 236 (TIY: 1-800- 424-9153)
www.n htsa.gov
National SAFE KIDS Campaign
T el.: (202) 662-0600
www.safe kids.o rg
Safety BeltSaf e U.S .A
Tel.: (800) 745-SAFE (English)
Te l.: (800) 7 47-SANO (Span is h)
www. carseat .org
Transport Canada Information C entre
Tel.: 1-800-333-0371 o r call
1-6 13-998-86 16 if you a re i n the Ottawa area
http://www.tc.gc.ca/e ng/ roadsafe ty/
men u.h tm
Audi Cu stomer R elation s
Tel.: (800) 822-2834

Audi pre sense Preventative passenger
protection
App lies to veh icles: with Audi p re se nse
Audi pre sense can initiate steps to help pro­
tect vehicle occupants in certain situations.
The funct ions descr ibed depend on equipment
installed in your vehicle:
Audi pre sense basic
The following functions can be triggered in
certain driving situations:
- Tightening of the safety belts (for example,
during heavy braking) : the front safety belts
have reversible belt pretensioners. If a colli ­
sion does not occur, the safety belts loosen
slightly and are ready to be tightened again.
- Closing the windows and the sunroof*: the
windows and the sunroof" close leaving a
small open gap .
Audi pre sense basic functions can be trig­
gered at speeds above 20 mph (30 km/h).
Vehicles with Audi drive select*: the deploy­
ment time is adapted in dynamic mode.
Audi pre sense front (vehicles with
adaptive cruise control*)
Audi pre sense front includes the functions in
Audi pre sense basic. In addition, within the
limits of the system, the likelihood of a colli­
sion with the vehicle immediately ahead is al­
so calculated . If the system senses an immi­
nent collision the following functions can be
tr iggered:
- Audi braking guard
c> page 93
-Tightening the safety belts
- Closing the windows and the sunroof* ( leav-
ing a small open gap)
Audi pre sense rear (vehicles with Audi
side assist*)
Audi pre sense rear includes the functions in
Audi pre sense basic. In addition, the likeli­
hood of a rear-end col lision with the vehicle
coming from behind is also calculated. If the
Audi pre sense 185
risk of a collision is detected, the following
functions can be triggered:
- Tightening the safety belts
- Closing the windows and the sunroof* (leav-
ing a small open gap)
- Adjusting the seats: the settings for the
power head restrains, the upper sections of
the backrests and the pneumatic side bol­
sters* are optim ized for the front seats and
the outboard rear seats*. If a collision does
not occur, the previous seat settings are re­
stored.
Audi pre sense plus
Audi pre sense plus includes the funct ions in
Audi pre sense front and Audi pre sense rear.
Error message
Audi pre sense: not available
Preventative passenger protection is not avail­
able. See your authorized Audi dealer immedi­
ately to have the malfunction corrected .
A WARNING
Audi pre sense cannot overcome the laws
of physics.
It cannot prevent a collision. Do
not let the increased safety provided
tempt you to take risks. This will increase
the risk of a collision and serious personal
injuries.
- The sensors cannot always detect all ob­
jects . This increases the risk of a colli­
sion.
-Audi pre sense does not detect people or
animals or objects that are crossing the
veh icle's path
c> page 87.
- The radar sensor's vision can be reduced
by heavy rain, ice, snow, heavy road spray
and reflections from guard rails, tunnel
entrances, etc. These and similar condi­
tions can prevent vehicles from be ing ac­
curately detected and in some cases they
may not be detected at all.
Ill-
•
•

186 Audi pre sen se
The sensors can be displaced by impacts or
damage to the bumper, whee l housing and
underbody. This can affect the function of
the Audi pre sense system. Have your au­
thorized Audi dealer check to make sure
that the system is working properly .
@ Tips
-Certain Audi pre sense functions are not
available when ASR is sw itched off (sport
mode) or w hen driv ing in reverse.
- The Audi pre sense functions may not be
available if there is a malfunction in the
ESC system or the airbag control mod­
ule.
- The Audi pre sense front/plus functions
are not available if the re is a ma lfunction
i n the adapt ive cru ise control* system
¢page 94.
- The Audi pre sense rear/plus functions
are not available if there is a ma lfunction
i n the Aud i side assis t* system
¢ page 94 .

Intelligent technology Notice about data
recorded by vehicle
control modules
Your vehicle is not equipped with an Event Da­
ta Recorder (EDR), installed by some manu­
facturers for the express purpose of capturing
data for retrieval after an accident or crash
event. EDR's are sometimes called "crash re­
corders".
Some state laws restrict the retr ieval or down­
loading of data stored by EDR's that were in­
stalled 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 electron­
ic control modules for various vehicle systems
such as, for examp le, engine function, emis­
sion control, as well as for the airbags and
safety belts.
These electronic control modules also record
vehicle-related data during norma l vehicle op­
eration for diagnostic and repair purposes.
The recording capacity of the electronic con­
trol modules is limited to data (no sound is re­
corded) and only a small amount of data is ac­
tually 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 we ll as restraint
system use and performance in the event of a
crash or other condition. Stored data can only be read and downloaded with special equip­
ment.
Electronic Stability
Control (ESC)
Description
ESC helps to improve road holding and vehicle
dynamics to help reduce the probability of
skidding and loss of veh icle control. It works
only when the engine is running. ESC detects
Intelligent technology 187
certain difficult driving situations, including
when the vehicle is beginning to spin (yaw)
out of control and helps you to get the veh icle
back under control by se lectively braking the
wheels, and/or reducing engine power and
providing steering ass istance to help hold the
vehicle on the driver's intended course. The in­
dicator light
Ip.] in the instrument cluster
blinks when ESC is taking action to help you
control the vehicle.
ESC has limitations .
It is important to remem­
ber that ESC cannot overcome the laws of
physics.
It will not always be able to help out
under all conditions you may come up against.
For example, ESC may not always be able to
help you master situations where there is a
sudden change in the coefficient of friction of
the road surface. When there is a section of
dry road that is suddenly covered with water,
slush or snow, ESC cannot perform the same
way it would on the dry surface . If the vehicle
hydroplanes (rides on a cushion of water in­
stead of the road surface), ESC will not be
able to help you steer the vehicle because con­
tact with the pavement has been interrupted
and the vehicle cannot be braked or steered .
During fast cornering, particularly on winding
roads, ESC cannot always deal as effectively
with difficult driving situations than at lower
speeds. When towing a trailer, ESC is not able
to help you regain control as it would if you
were not tow ing a trailer.
Always adjust your speed and driving style to road, traffi<; and weather conditions. ESC can­
not override the vehicle's physical limits, in­
crease the available traction, or keep a veh icle
on the road if road departure is a result of
driver inattention. Instead, ESC improves the
poss ibility of keeping the vehicle under con­
trol and on the road dur ing extreme maneu­
vers by using the driver's steering inputs to
help keep the vehicle going in the intended di­
rection. If you are traveling at a speed that
causes you to run off the road before ESC can
provide any assistance, you may not experi­
ence the benefits of ESC.
•
•

188 Intelligent technology
ESC includes and/or works together with the
anti-lock braking system (ABS), brake assist
system, anti-s lip regulat ion (ASR), e lectronic
d ifferential lock ( EDL), dynamic steering* and
e lectronic interaxle differentia l lock*. ESC is
switched on all the time. I n certa in s ituations
when you need less tract io n, you ca n sw itch
off ASR by pressi ng the button above
~ page 189, fig. 167 the se lector lever. Be
sure to sw itch ASR on ag ain when you no lon­
ger need less trac tion.
Anti -lock braking system (ABS)
ABS prevents t he wheels from locking up
when braking. The veh icle can still be st eered
even d uring ha rd b rak ing . Apply steady p res­
sure to the br ake ped al. Do no t pu mp the ped­
a l. A puls ing in t he bra ke peda l ind icates that
the system is he lping yo u to b rake the vehicle .
Brake assist system
The brake assist system can decrease b ra kin g
d ista nce. It increases braking powe r w hen the
d river p resses the brake pedal quickl y in eme r­
gency situa tions . You mus t press and ho ld the
b rake peda l until the situation is over. In vehi­
cles with adaptive cruise control*, the brake
assist system is more sensitive i f the d istance
detected to the vehicle ahead is t oo smal l.
Anti-slip regulation (ASR)
ASR reduces engine power w hen the drive
wheels begin to spin and adapts the fo rce to
the road condit ions. This makes it eas ier to
start, accelerate and drive up hills.
Electronic differential lock (EDL )
The E DL brakes wheels that are spinn ing and
transfers the drive powe r to the o ther d rive
wheel o r whee ls if the vehic le is equipped with
a ll whee l drive*. This funct ion is available up
to about 7S mph (120 km/h).
I n extreme cases , EDL automatica lly swit ches
off to help keep the brake on the braked whee l
from overheating. ED L wi ll switch on again au­
tomatically when conditions have returned to normal.
Dynamic steering*
On vehicles wi th dynam ic s teeri ng, ES C helps
stab ilize the steer ing in cer tain sit uations.
Electronic interaxle differential lock
function*
T he ele ctronic i nte raxle di fferentia l lock f unc ­
tion ac tiva tes when dr iving t hrough curves.
B ra king is targeted towar d the whee ls on the
inside of the curve as needed . This helps to
min imi ze front whee l skid, improves traction
and allows for more precise driving throug h
cu rves .
A WARNING
- ESC, ABS, ASR , EDL, dynamic steering*
and the elect ronic interaxle differential
loc k function* cannot ove rcome t he laws
of physics . This is espe cially im po rtant
on slippery o r we t road s.
If the sys tems
begin actin g to stabilize your veh icle, you
should immediately change yo ur speed
to match the road and t raffic conditions .
Do not let the increased safety provided
by these systems tempt you to take risks. Doing so will increase the risk of a loss of
veh icle cont ro l, collision and ser io us per­
sonal injur ies .
-Always ada pt your speed to road , traffic
and wea ther conditions. The risk of los­
ing contr ol of the vehicle i ncreases wh en
d riving too fast, espe cially through
curve s and on slippe ry or wet roads, and
when dr iv ing too close to vehicles up
ahead. ESC, ABS, the brake ass ist sys ­
tem, EDL, ASR, dynam ic steering * and
the elect ron ic interaxle differential lock
function * cannot prevent co llisions.
- Always accelerate with s pecial care on
even, smooth s urfaces such as those that
are wet or covered with ice and snow.
The drive wheels can spin even w ith
these assistance sys tems that cannot al­
ways he lp to red uce the risk of loss of ve ­
h icle co nt ro l.
-

@ Tips
-ABS and ASR on ly work correctly when
all four wheels are equ ipped with identi­
cal t ires. Different tire s iz es can lead to a
reduct ion in eng ine power.
- You may hear noises when the systems
described are working.
- If the indicator light
D] or m (USA
models) ;£1 (Canada models) appears,
there may be a malfunction¢
page 19,
c> page
18 .
Switching on and off
ESC
turn s on au tomatically when you s tart
the engine .
Fig. 167 Cen te r con sol e wit h ES C OF F but ton
Switching ASR off (sport mode )
In certain sit uat ions, you can switch ASR and
ESC in to sport mode by pressing the bu tton
[ru
c> fig. 167 . The indicator light I comes o n
and the message
Cauti on! R edu ced t ra cti on
appears. ASR deactivates completely and the
assistance provided by the ESC system is lim it­
ed . Switch to sport mode only when your driv ­
ing skills, traffic and weathe r conditions per­
mi t.
I n some s ituations, it may be useful to switc h
ASR off to let the wheels slip. Example:
- Rocking the vehicle back and forth when it is
stuck
- Driv ing in deep snow or on loose ground
- Driving with snow cha ins
Switching ASR on
Press the button [fil again. The message Sta­
bility program on
appears.
Intelligen t technolog y 189
A WARNING
-Drive whee ls can sp in and you can lose
control of the vehicle more eas ily when
ASR and ESC are in sport mode, especial­
ly whe n the road is slippe ry .
- Sw itch to sport mode only when your
driving skills, traff ic and weather condi­
tions permit.
(D Tips
You cannot sw itch sport mode on whe n
adaptive cruise control* is working .
Braking
General information
What affects braking efficiency?
Operating cond itions and driving h abits
The brakes o n today's automobiles are still
subject to wear, depend ing largely on operat­
i ng condit ions and driving habits ¢&, . On ve­
hicles that a re either dr iven most ly in stop­
and-go c ity t raff ic or are dr iven hard, the
brake pad s should be checked by yo ur author ­
i zed Audi dealer more often than specified in
the
Warranty & Maintenance booklet. Failure
to have your brake pads inspected can result in reduced brake performance.
On steep slopes, you sho uld use the braking
effect of the eng ine . T his way, you prevent un­
necessary wear on the brake system . If you
must use your brakes, do not hold the br akes
down cont inuous ly . Pump the brakes a t in ter­
vals .
Moisture o r ro ad sa lt
Under certa in conditions, for example, when
driv ing through water or very heavy ra in, or
even after washing your veh icle, the braking
effec t can be reduced due to moisture (or in
freez ing cond itions ice) on the brake pads . A
few carefu l brake applications should dry off
the b ra ke pads or remove a ny ice coatings.
When you are driving a t higher speeds with
the windsh ie ld w ipers on , the brake pads will
IJJJ,

190 Intelligent technology
briefly touch the brake discs in regular inter ­
va ls so as to improve reaction time when brak­
ing on wet surfaces. You the driver wi ll not no­
tice anything.
The effectiveness of the brakes can be reduced
when the vehicle is driven on a salt-covered road and the brakes are not used. Here too,
you sho uld clean off accumu lated salt coat ing
from brake d iscs and pads with a few careful
applicat ions of the brake¢,& .
Cor ro sion
There may be a tendency fo r dirt to bui ld up
on the brake pads and corrosion to form on
the discs if the car is not dr iven regularly or
only for short trips with little use of the
brakes .
If the brakes are not used frequently, or if cor­ rosion has formed on the discs, it is advisab le
to clean off the pads and discs by brak ing
firm ly a few times from a moderately high
speed <=>,& .
Fault s in the brake sy stem
If you should notice a sudden increase in
brake peda l travel, then one of the two brake
circu its may have failed¢,& .
Low brake flu id le vel
M alfunctions can occur in the brake system if
the brake fl uid level is too low. The brake fluid
leve l is monitored electronically .
Brake lining wear status
Brake lin ing wea r may be chec ked by v is u al in­
spection of the condition of the brake pads
through the openings in the whee l. If neces ­
sary, the whee l may be removed for this in­
spection ¢ page 2 59, Changing a wheel.
A WARNING
-You should perform brak ing maneuvers
for the purpose of clean ing the brake
system on ly if road con ditio ns pe rmit.
Oth er road users must not be put at r isk -
yo u may cause an ac ciden t! -
Before descend ing a steep grade, red uce
speed and sh ift transmission into a lower
gear or lower dr iving range. Do not ride
the brakes or hold the pedal down too
long o r too often . This could cause the
brakes to get hot and diminish braking
efficie ncy.
- Do not "ride the brakes" by rest ing you r
foot on th e pedal whe n you do not intend
to b rake. This may c ause the brake s to
overhea t, prem ature wear and incre ased
stopping distance.
- Unde r cert ain cl im atic and ope rat ing
conditions s uch as passing thro ugh wa ­
ter, driving in heavy rain o r after washing
the vehicle, the effectiveness of the brakes can be reduced. In winte r, ice can
accumu late on the brake pads, lin ings,
d iscs and drums. Carefully app ly brakes
for a test. Brakes will dry and ice coat­ i n gs w ill be cleaned off after a few care­
fu l brake applicat ions.
- Driving for an extended period of t ime on
salt-covered roads without using your
b rakes can a lso affect bra kin g efficiency .
Clea n off accum ulate d sal t coa ting from
b rake discs and pads wi th a few c areful
b rake applications .
- If you d am age t he fron t spoiler, or i f yo u
install a diffe rent spoiler, be s ure the a ir
f low to the front brakes is not obstruc t­
e d. Otherwise the brake system could
overheat reducing the effectiveness o f
the entire brake system.
- Fa ilure of one brake circuit will impa ir
the braking capab ility result ing in an in­
creased stopping distance. Avoid driving
the vehicle and have it towed to the near­
est A udi dealer or qualified workshop .
Brake booster
The brake booster adds extra braking power.
T he brake booster wo rks with vacuum pres­
s ur e which is created only when the engine is
runn ing
c> ,& . ..,.