2017 AUDI A8 brake

Assist Interrupting cruise control
Applies to: vehicles with Audi adaptive cruise contro l
Fig. 110 Selector leve r
Requirement: adaptive cruise control mus t be
sw itched on .
Overriding cruise control
• To accelerate manually , pull the lever toward
you into position @and hold it there . T he mes­
sage
ACC: override appears . Or
• press the accelera tor pedal.
• To resume cruise control , release the lever or
take your foot off the accelerator pedal.
Canceling cruise control while driving
• Move the lever into position @. The message
ACC: standby appears . Or
• press the brake pedal.
• To resume the stored speed, move the lever in ­
to posit ion @.
Canceling cruise control when stopped
• Push the lever away from you into position @.
The message
ACC : standby appears.
• To resume cruise control, press the brake pedal
and pull the lever toward you into position @.
.&, WARNING
It is dangerous to activate cruise control and
resume the stored speed when the current
road, traffic or weather conditions do not per­
mit this. This increases the risk of an accident.
98
Setting the distance
Applies to: vehicles with Audi adaptive cruise control
Fig. 111 Ope rating leve r: sett ing th e dis tan ce
• Tap the switch to display the current set dis­
tance
¢ fig . 111 .
• To increase or reduce the distance in incre­
ments, tap the switch again to the right or left .
The distance between the two veh icles will
change in the instrument cluster display .
When approaching an object ahead, the adaptive
cruise contro l system brakes to match that speed
and then adjusts to the set distance.
If the object
ahead accelerates, adaptive cruise control will al­
so accelerate up to the stored speed .
The higher the speed, the greater the distance
¢ ,&. .The
Distance 3 setting is recommended .
That is equal to the general recommendation of
"half the speed shown on the speedometer".
The distances provided are spec ified values . De ­
pending on the driving situation and the way the
object ahead is dr iving, the actual distance may
be more or less than these target distances .
The var ious symbo ls for the time increments ap­
pears briefly in the information line @
¢
page 96 , fig . 108 when you change the set­
tings .
c::::,_c::::, ___ Distance 1 : this setting corresponds
to a distance of 92 ft (28 m) when traveling at 62
mph (100 km/h), for example (time between: 1
second) .
c::::, __ c::::, __ Distance 2: this setting cor responds
to a distance of 118 ft (36 m) when traveling at
62 mph (100 km/h) , for example (time between:
1.3 seconds) . ""

C) C0 ....
"' " "' .... 0 0 :r ~-- -~ -Di st a nce 3: this setting corresponds
to a distance of 164
ft (SO m) when traveling at
62 mph (100 km/h), for examp le (time between :
1.8 seconds).
~-- --~ Dist a nce 4: This setting corresponds
to a distance of 210
ft (64 m) when traveling at
62 mph (100 km/h), (time distance of 2.3 sec­
onds).
A WARNING
Following other vehicles too closely increases
the risk of coll isions and ser ious personal in ­
jury.
- Setting short distances to the traffic ahead
reduces the t ime and distance available to
br ing your vehicle to a safe stop and makes
it even mo re necessary to pay close atten­
t ion to traffic.
- Always obey applicable traffic laws, use
good j udgment, and select a safe following
distance for the traffic, road and weather
condit ions .
@ Tips
- Di stance 3
is set automatically each time
you switch the ignition on.
- Your settings are automatically stored and
assigned to the remote control key being
used.
Selecting the driving mode
A pp lies to: ve hicles with Audi adaptive cruise co ntrol
.,. Se lect the des ired driving mode in dr ive se lect
c> page 110 .
@ Tips
Your se ttings a re au toma tical ly s to red and as­
signed to the remote control key being used.
A ss ist
Driver intervention request
App lies to : vehicles wit h Aud i ada ptive cr uise control
Fig. 112 Instrume nt cl uster : request fo r drive r in terven ­
tio n
In certain situa tions, the system will request you
to take action:
- if the braking from the adap tive cruise contro l
system is not enough to ma intain eno ugh dis­
t ance to the object ahead.
The da nger is indicated by the. indicator light
r:!> fig . 112. An audio signal will a lso sound .
- Press the brake pedal to slow your vehicle
down.
Audi braking guard
Appl ies to: vehicles wit h Audi ada ptive cr uise control
Fig. 113 Instrument cluster : approach wa rnin g
The braking guard uses radar sensors and a v ideo
camera. It also functions within the limits of the
system when adaptive cru ise control is switched
off .
Wh at can the b raking guard do?
When detected in time, the system can assess
dangerous situations where an object ahead
brakes suddenly or if your own vehicle is traveling .,..
99

Ass is t
at a high speed and approaching an object that is
moving more slowly. The braking guard does not
react if it cannot detect the s ituation.
The sys tem advises you of various dangerous si t­
uations :
- T he
distan ce warning occurs if you drive too
closely to t he object ahead for a long period of
time . If the ob je ct ahead b rakes strongly, you
would not be able to avoid a collis ion . The .
indicator light appears as an indication for this.
- T he
app roach wa rning occurs when an object
ahead is traveling more slow ly or brakes
strongly . When this warning occurs, it may on ly
be possib le to avoid a co llision by swerv ing or
braking strong ly. The danger is indicated by the
• indicator light
c> fig. 113. An audio signal
will also sound.
If you do not react early enough or at a ll to a dan­
gerous situation, the braking guard supports you
with a brak ing intervention. The approach warn­
ing indicators and the message
Braking guard :
e n gaged
also appear .
- If a collision is imminent, the system will first
provide an
ac ute wa rni ng by braking sharply.
- If you do not react to the acute warning, the braking guard can increase the braking force
within the limits of the system. This reduces
the vehicle speed in the event of a co llision.
- The system can init iate comp lete deceleration
sho rtly before a collision
ll . Full decele ration at
high speeds occurs only in vehicles with adap­
tive cru ise cont rol and s ide assist (pre sense
pl us).
- If the braking guard determines that you are
not brak ing strongly enough when there is an
impending co llision, it can increase the bra king
f o rce .
- T he pre se nse functions also engage when
the re is an impend ing collision
c:> page 216.
Which functions can be controll ed ?
You can switch the braking guard and the dis ­
tance/approach warn ing on or off in the lnfotain-
l ) Ma rket -spe cific
100
ment system c:> page 101, Settings in the Info­
tainment system.
A WARNING
Lack of attent ion can cause collisions, other
accidents and ser ious personal inju ries. The
braking guard is an assist system and cannot
p revent a collision by itself . The driver must
a lways inte rvene . The driver is always respon­
sib le for braking at the co rrect t ime .
- Always pay close attention to traffic, even when the b raking guard is sw itched on. Be
ready to intervene and be ready to take
comp lete contro l whenever ne cessa ry . Al­
ways keep the sa fe and legal dist ance be­
t ween your vehi cle and veh icles up ahead .
- Br ak ing g uard works w ithin limits and will
no t respond o utside the system limits, for
examp le when approaching a stopped vehi ­
cle or stationary obstacle (en d of a traffic
jam or vehicle that has broken down in traf­
fic).
- Always remember that the radar sensor for
the brak ing g uard works only within def ined
detection and range limits that may prevent
the prope r detection o f other vehicles.
- The radar sensor 's function and range can
be reduced by rain, snow and heavy spray.
Moving vehicles up ahead may not be
promptly detected or may not be detected
at al l.
- Reflective surfaces including crash barr iers
or tunnel entrances may impair the function
of the radar sensor.
(D Tips
- You can cancel the braking with increas ing
force that is initiated by the system by bra k­
ing yourself, by acce le ra ting not iceably or
by swerving.
- Keep in mind that braking gua rd can brake
unexpectedly. Always secure any cargo or
objects tha t you are transpo rting to redu ce
t h e risk of damage or injury.

0 co .... N ,..._
N .... 0 0 :c ' Settings in the Infotainment system
Applies to: vehicles with Audi adaptive cruise contro l
.,. Se lect: t he I CAR I fu nction bu tton > Car systems
co ntro l bu tton > Driver a ssist > Audi braking
guard .
System -
Switch the bra kin g g ua rd On/ Off. When
you swit ch the ig nition on, the message
Braking
guard: Off
appears if t he sys tem is switched o ff.
Early warning -The distance and approac h warn­
i ngs i n the display can be sw itched
On/ Off.
@ Tips
- Your settings are automatically stored and
ass igned to the remote cont rol key bei ng
used.
- If you restric t or sw itch off the ESC, the
braking gua rd also sw itches itself off
¢ page 12 7.
- Switch braking guard off when yo u are load­
i ng t he ve hicle on to a vehicle ca rr ier, t rain,
shi p or other type o f transportation. This
c a n p reven t undesired w arnings from the
br akin g guard system.
Messages
Applies to: veh icles with Audi adaptive cruise control
Braking guard: Off
This message appea rs if the sys tem is switc hed
off through the In fota inme nt system . Otherwise ,
if the system is tur ned off, the informa tion ap ­
pears every time shortly after the start of t he
tr ip.
The message also appears if the system is not
avai la bl e d ue to a ma lfunction or if the ESC is
switched off~
page 127. If this is the case, the
system w ill not prov ide warnings about a possi ­
b le co llision.
Braking guard : engaged
This message appea rs if a sha rp bra ke press ure
was applied due to an ac ute wa rn ing.
ACC: unavailable
ACC and Audi braking guard: Unavailable Assist
T
he system cannot gua rantee that it will detect
objects co rrectly and is sw itched off . The sensors
have been moved or are faulty. The p re sense
funct ions may a lso be affected . D rive to an au­
t h ori zed Audi dea ler or authorized Audi Service
Facility immed iate ly to have the malfunction cor ­
rected .
ACC: Currently unavailable. No sensor vis ion
ACC and Audi braking guard: Cu rrently unavail­
able. No sensor vision
Th is mess age appears if the senso r view i s ob ­
str ucted, for examp le by leaves, snow , heavy
spray or dirt. Clean the sensors¢
page 94 ,
fig . 104.
ACC : Currently unavailabl e. Gradient too steep
The road exceeds the maximum poss ible angle
fo r safe adaptive c ruise cont rol operat io n. Adap­
t ive cr uise control is sw itched off.
ACC: only available in D, Sor M
Se lect the D, Sor M selector leve r pos ition.
ACC : Currently unavailable. Parking brake ap •
plied
The ad apt ive cr uise cont rol system sw itches off
a utoma tica lly if the parking brake is se t.
ACC: Currently unavailable . Stability control
( ESC) input .
This message appears if the Electronic Stab iliza­
t ion Control (ESC) is taking action to stab ilize the
vehicle . In t his case, adaptive cruise control
switches off automatically .
ACC off: manual control!
This message appears when adaptive cruise con­
trol cannot set the parking brake. P ress the brake
pedal to prevent the vehicle from ro lling.
• ••
T h ree white do ts appear if a setting canno t be se­
l ecte d w it h t he oper ati ng leve r. For ex ample, this
h appens if a daptive cr uise con trol c annot sta rt
driv ing a utomat ica lly in stop -and -go traff ic be ­
ca use the dr iver has not fastene d their safety
belt . ..,.
101

Intelligent Technology
Intelligent Technology
Electronic Stabilization
Control (ESC)
Description
The ESC increases driving safety . It reduces the
risk of s lipping and improves driving stabi lity.
ESC detects critical situations such as when the
veh icle is oversteer ing and understeering or the
wheels are spinning. The vehicle is stabilized by
apply ing the brakes or reducing eng ine torque .
When ESC engages, the
Ji] ind icator light blinks
in the inst rument cluste r.
The fo llow ing systems are integrated in the ESC:
Anti -lock b raking system (ABS)
ABS prevents the whee ls from locking when brak­
i n g . The vehicle can sti ll be steered even d uring
hard brak ing. Apply steady press ure to the brake
pedal. Do not pump the pedal. A puls ing in the
brake pedal indicates that the system is acting to
stabilize the vehicle.
Brake a ssi st sy stem
The brake assist system can dec rease braking dis­
tance. It increases brak ing power when the driver
presses the brake pedal quick ly in emergency sit­
uations . You must press and hold the brake pedal
until the dangerous situat io n is over . In veh icles
w ith adapt ive c ruise control*, the bra ke assis t
system is more sensitive if the distance detected
to the veh icle dr iv ing ahead is too small. On
ve hicles w ith act ivated and functi oni ng night vi­
sion assist*, the brake assist system can respond
more sensit ively if there is a warning .
Anti-slip regulation (ASR)
A SR red uces eng ine power when the d rive wheels
begin s pinning and ad apts the force to the road
conditions. This makes it easier to sta rt, acceler ­
ate and dr ive up hi lls.
Electronic differential lock (EDL )
EDL applies the brakes to a wheel that sta rts
sp inning and t ransfe rs t he d rive powe r to t he
o ther d riving w heels. This f unct ion is not av aila ­
b le at higher speeds .
126
In extreme cases, ED L automat ically switches off
to keep the b rake on the braked whee l from over­
heating. The veh icle is still working correct ly. ED L
will switc h on again automatically when condi­
tions have returned to normal.
Steering recommendat ion
The E SC he lps to stabili ze the vehicle by changing
the steering torque.
I n veh icles with dyna mic steer ing*, ESC a lso
helps to sta bilize the s teer ing in cr it ica l situa ­
tions.
Selective wheel torque control
Se lective wheel to rque cont rol is used when d riv­
i ng on curves.
The fro nt wheel on the ins ide of the curve or bo th
whee ls on the inside of the curve are braked se­
l ectively as needed. This allows more pre cise d riv­
i ng in cu rves. The applicab le system may no t ac ti­
vate when dr iv ing in we t or snowy condi tio ns.
Automatic post -collision braking system
The "automat ic post-coll is io n braking system"
can help to reduce the risk of sl iding and of addi­
tiona l co llisions after an acc iden t. If the a irbag
c ontro l modu le detects a collision above a cer tain
vehicle speed, the ve hicle is braked by the ESC.
The veh icle does not b rake automatically if:
- the drive r presses the acce lerator pedal, or
- the bra king force generate d by the pressed
brake pedal is greater than the b raking force
that would be in itiated by the system, or
- the ESC, the bra ke system or the vehicle electri­
cal system are not functioning.
A WARNING
- The ESC and its integ rated systems can not
overcome the lim its imposed by natura l
p hys ica l laws. Th is is es pec ially impor tan t
on s lippery or wet roads. If the system s be­
g in a cting to stabilize yo ur vehicle, you
should immedi ately alte r your speed to
match the road and tra ffi c conditions. Do
not let t he i ncreased safety provi ded tempt

Intelligent Technology
Brakes
New brake p ads
New b rake pads do no t achieve the ir full b raking
effect during the firs t 250 mi (400 km) . They
m ust be "broken in" first . The b reak -in period can
be considerably longe r for vehicles with ceram ic
brake rotors* . However, you can compensate for
the slightly reduced braking force by pressing
firm ly on the brake pedal. Avo id heavy braking
during the break-in period .
Wear
Brake pad wear depends largely on the way the
veh icle is driven and on operat ing cond itions.
This is especially true if you are driving frequently
in the c ity and on curves or with a sporty driving
style .
Operating noise
Noises may occur when braking depend ing on the
speed, braking force and outs ide cond itions such
as temperature and humidity.
Noises may become more appare nt at lowe r
speeds due to the nature of the materia ls in the
ceramic brake rotors*.
Effect of water and road salt
I n cer tain s ituations, for example a fter driving
through water, in heavy rain, afte r ove rnig ht con ­
densation or after washing your car, the braking
effect can be red uced by moisture or ice on the
brake rotors and b rake pads . The brakes must be
"dr ied" first w ith a few care ful b rake applica­
tions .
At higher speeds and with the windshie ld wipers
turned on, the brake pads press aga inst the brake
rotors for a short amount of time. T his action,
which is no t felt by the driver, happens at regular
i n tervals a nd ensu res a better react ion time for
the bra kes in wet weather.
The braking effect can also be reduced if you are
driving on salted roads a nd you do not apply the
brakes fo r long pe riods of time. The laye r of salt
o n th e brake roto rs and pads mus t be wo rn off
fi rs t when the brakes are app lied.
128
D ue to its s urface, the ce ram ic brake rotor * ab ­
sorbs moisture in ce rtain situations. The refore,
there will tempora rily be less brak ing fo rce than
whe n the brakes are d ry . You can compensate for
th is by press ing the brake pedal harder.
Corrosion
Leav ing the ve hicl e pa rked for long periods of
time , low mileage and avoiding heavy b raking
can contrib ute to corros ion on the b rake roto rs
and to dirty brake pads.
If you usua lly avoid heavy bra king or if there is
cor rosion p resent, occasiona l heavy brak ing at
high speeds is recommended to clean the brake
rotors and pads
c> ,& .
Brake system malfunction
if you no tic e th at the b rake peda l t ravel has sud­
denly
increase d, then a bra ke circuit in the dua l­
c ir cuit b rake system may have malfunctioned.
D rive to an authorized A udi dealer or authorized
Audi Service Facility immed iate ly to have the
problem corrected . On the way there, drive w ith
reduced sp eed and keep in m ind that you wilt
need a longe r distance to stop and you will need
to press the b rake peda l ha rder.
Low b rake fluid level
When the brake fluid level is low, malfunctions in
the b rake system may occur . The brake fl uid level
i s e lec tronically moni to red.
Brake booster
The brake booster amp lifies the pressure you ap­
ply to the brake pedal. It only wor ks when the en­
gine is running.
A WARNING
- On ly app ly the brakes for the purpose of
cleani ng the bra ke sys tem w hen road and
t raffic cond itions permit. You must not en­
da nger ot her roa d users . T h is i ncreases the
r isk of an acci den t.
-
- Never le t th e ve hicle roll while t he engi ne is
stop ped bec ause this increa ses the r is k of an
a cciden t. ..,.

0 co .... N ,..._
N .... 0 0 :c ' -New brake pads do not achieve their fu ll
brak ing effect during the first 250 mi
(400 km). They must be "broken in" first.
However, you can compensate for the
sl ightly reduced braking force by pressing
firmly on the brake pedal. Avoid heavy brak­
ing dur ing the b reak-in per iod.
- Certa in weather and operat ing cond it ions
such as dr iving t hrough water, d riving in
heavy ra in or d riving after washing your ve­
hicle ca n impair the effectiveness of the
bra kes . In the w inter, ice may b uild up on
the brake pads, rotors and drums . Check
these components by braking carefu lly. Ap­
plying the brakes carefu lly several times
dr ies the brakes and removes ice bu ild-up.
- The effic iency of the brakes can also be im­
paired by driving for long st retches on roads
cove red w ith salt without using the b rakes.
Yo u can remove sa lt deposits from the
bra ke rotors and pads by caref ully applyi ng
the brakes severa l t imes .
- If the front spoiler is damaged or you install
another spoiler, ma ke sure the front wheel
bra kes are vent ilated prope rly. O therwise,
the br ake system could overheat, wh ic h re­
duces the ir effectiveness.
- Failure of a brake circui t impai rs b raking
perfo rmance, whi ch incre ases bra king dis­
tance . Avoi d driving the vehicle and have it
towed it to the nearest author ized Audi
dealer or authorized A udi Se rvice Facility .
- If the bra ke booster is not wor king, you will
have to press m uch ha rder on the bra ke
peda l to compensate for the lack of the
booster.
(D Note
- Never let the brakes "rub" by pressing the
pedal lightly when braking is not actually
necessary. This causes the brakes to over­
heat and inc reases braking d istance and
causes wear.
- Before driving downh ill a long distance on a
steep h ill, decrease your speed and select a
l ower gear. This makes use of the engine
braking effect and relieves the brakes . If Intellig
ent Technology
you need to bra ke ad ditiona lly, bra ke in in­
terva ls and not continuous ly .
(D Tips
- If the brake boos ter is not wor king, you
must press the brake peda l with much more
force than normal.
- If you retrof it your vehicle with a front spo il­
er, wheel covers or simi lar items, make su re
that the air f low to the front wheels is not
inter rupted. Otherwise the b rake system
can become too hot.
Electromechanical
steering., dynamic
steering
The electromechanical steering supports the
driver's steering movements.
Power s teer ing adapts electronically based on
the ve hicle speed .
Indicator lights and messages
• Do not dr ive vehicle: Steering defective
If this indicator light turns on and stays on and
t hi s message appears, the power steering may
have failed.
Stop the vehicle in a safe location as soon as pos­ s ible. Do
not cont inue drivi ng. See an authorized
Audi dealer or authorized Audi Service Fac il ity for
ass ista nce.
l;rj Steering: System fault You can continue
driving
If the indicator light turns on and the message
appears, the steering wheel may be more d iffi ­
cu lt to move or m ore sensitive than usual. The
steering wheel may also be at an angle when
driv ing stra ight .
Drive slowly to an a uthorized Audi dea ler or au­
thori zed Audi Serv ice Facility to have the mal­
funct ion corrected .
'T-ij Dynamic stee ring: Initializing
If the indicato r ligh t is blinking and this mess age
appe ars, dynamic steering* is be ing ini tialized. .,.
129

Intelligent Technology
To restore the balance of energy, components
that require large amounts of energy are tempo­
rarily scaled back or switched off. Heating sys­
tems in particular require a great deal of energy .
If you notice, for example, that the seat heating"
or rear window defogger is not working, then it has been temporarily reduced or switched off .
These systems are available again as soon as the
energy supply has been restored.
In addition, you may notice that the idle speed
has slightly increased. That is normal and no
cause for concern . By increasing the idling speed,
the additional requ ired energy will be generated
and the vehicle battery will be charged.
Notice about data
recorded by the Event
Data Recorder and
vehicle control modules
Event Data Recorder
This vehicle is equipped with an Event Data Re­
corder (EDR). The main purpose of an EDR is to
record, in certain crash or near crash-like situa­
tions , such as an airbag deployment o r hitting a
road obstacle, data that will assist in understand­
ing how a vehicle 's systems performed. The EDR
is designed to record data related to vehicle dy­
namics and safety systems for a short period of
time, typically 30 seconds or less. The EDR in this
vehicle is designed to record such data as :
- How various systems in your vehicle were oper­
ating;
- Whether or not the driver and passenger safety
belts were buckled/fastened;
- How far (if at all) the driver was depressing the
accelerator and/or brake pedal; and,
- How fast the vehicle was traveling.
These data can help prov ide a better understand­
ing of the circumstances in which crashes and in­
juries occur. NOTE: EDR data are recorded by your
vehicle only if a non-trivial crash situation occurs ;
no data are recorded by the EDR under normal
driving conditions and no personal data (e .g.,
name, gender, age, and crash location) are re­
corded. However, other parties, such as law en-
132
forcement, could combine the EDR data with the
type of personally identifying data routinely ac­
quired during a crash investigation.
To read data recorded by an EDR, special equ ip­
ment is required, and access to the vehicle or the
EDR is needed . In addition to the vehicle manu­
facturer, other part ies, such as law enforcement,
that have the special equipment, can read the in­
formation if they have access to the vehicle or the
EDR .
Some state laws restrict the retrieval or down­
loading of data stored by ED Rs installed in a vehi­
cle for the express purpose of retrieving data af­
ter an accident or crash event without the own ­
er 's consent .
Audi will not access the EDR and/or simi lar data
or give it to others -
- unless the vehicle owner (or lessee if the vehi ­
cle has been leased) agrees; or
- upon the official request by the police; or
- upon the order of a court of law or a govern-
ment agency; or
- for the defense of a lawsuit through the judicial
discovery process.
- Audi may also use the data for research about
veh icle operation and safety performance or
provide the data to a third party for research
purposes without identifying the specific vehi­
cle or information about the identity of its own ­
er or lessee and only after the recorded vehicle
data has been accessed.
Vehicle control modules
Your vehicle is also equipped with a number of
electronic control modules for various vehicle
systems, such as engine management, emission control, airbags, and safety belts.
These electronic control modules record data during normal vehicle operation that may be
needed by trained technicians for diagnostic and
repair purposes. The recording capability of these
modules is limited to data (no sound is record­
ed) . Only a small amount of data is actually re­
corded over a very limited period of time, or stor­
ed when a system fault is detected by a contro l
module . Some of the data stored may relate to .,._