brake AUDI S8 2014 Owner's Manual

Switching off completely
"'Press leve r into position @(clicked into
place), or
"' Switch the ignition off.
The system reta ins the saved speed if you de­
activate the cru ise control temporarily. To re­
sume the saved speed, release the brake ped­
a l and pull the lever to position @.
Switching the ignition off erases the saved
speed .
& WARNING
You should only return to t he saved speed
if it is not too fast for the current traffic
conditions -risk of an accident!
On the road 93

94 Audi adapti ve cruise control and bra king gu ard
Audi adaptive cruise
control and braking
guard
Introduction
App lies to vehicles: with Audi adaptive cruise co ntrol
The adaptive cruise control system assists the
driver by regu lat ing vehicle speed and helping
to maintain a set distance to the vehicle
ahead, within the limits of the system.
If the
system detects a moving vehicle up ahead,
adaptive cruise control can brake and then ac­
celerate your vehicle. This helps to make driv­
ing more comfortable both on long highway
stretches and in stop-and-go traffic.
The braking guard system can warn you about
an impending collision and initiate braking
maneuvers¢
page 100.
Adaptive cruise control and braking guard
have technical limitations that you must
know, so please read this section carefully, un­
derstand how the system works and use them
properly at all times.
General information
General information
Applies to vehicles: with Audi adaptive cruise control
Fig. 93 Front of th e veh icle: senso rs and video camera
The areas that conta in the radar and ultrason­
ic sensors and the v ideo camera ¢
fig. 93
must never be covered by stic kers or other ob­
jects or obstructed w ith dirt, insects, snow or
i ce that will interfere with the adaptive cruise
control system and braking guard. For infor­
mation on cleaning, refer to¢
page 216. The same applies for any modifications made in
the front area.
T he function of the adaptive cru ise contro l
system and braking guard is limited under
some cond itions:
- Objects can only be de tected when they are
w ith in sensor range¢
page 96, fig. 96.
- The system has a limited ability to detect
objects that are a short d istance ahead, off
to the side of your vehi cle or mov ing into
your lane.
- Some kinds of ve hicles are hard to detect;
for examp le motorcycles, veh icles with high
ground clearance or overhanging loads may
be detected when it is too late or they may
not be detected at all.
-When driving through curves
¢page 95 .
-Stat ionary objec ts ¢page 95.
& WARNING
A lways pay attention to traffic when adap ­
tive cruise contro l is switched on and brak­
ing g uard is active. As the dr iver, you are
still respons ible for starting and for main­
taining speed and distance to other ob­
jects. Braking guard is used to assist you .
The dr iver must a lways take action to avo id
a collis ion . The driver is a lways respons ible
for braking a t the co rrec t time.
- Imp roper use of adaptive cru ise control
can cause collisions, other acc idents and
serious pe rsonal in jury.
- Never let the comfort and convenience
that adaptive cruise control and braking gua rd offer d istract you from the need to
be alert to traffic condit ions and the
need to rema in in fu ll control of your ve­
h icle at a ll times,
- Always remember that the adaptive
cruise control and braking guard have
limits -they will not s low the vehicle
down or maintain the set distance when
you drive towards an obstacle or some­
thing on or near the road that is not
mov ing, such as vehicles stopped in a
traffic jam, a stalled o r disabled vehicle.
I f registered by the radar sensors,

Audi adapt ive crui se c ontrol an d bra kin g guard 95
vehicles or obstacles that are not moving
can trigger a collision warning and if con­
firmed by the video camera, an acute col­ lis ion warn ing.
- For safety reasons, do not use adaptive
cruise control when driving on roads with
many curves, when the road surface is in
poor condit ion and/or in bad weather
(such as ice, fog, gravel, heavy rain and
hydroplan ing). Using the system under
these cond itions cou ld result in a co lli ­
sion .
- Switch adaptive c ruise control off tempo­
rar ily when driv ing in turning lanes, on
expressway exits or in construction
zones . This prevents the vehicle from ac­
celerating to the set speed when in these
situations .
- The adapt ive cru ise control system w ill
not brake by itse lf if you put your foot on
the accelerator pedal. Doing so can over­ ride the speed and distance regulation .
- When approaching stationary objects such as stopped traffic, adaptive cruise
control will not respond and braking
guard w ill have limited function.
- The adapt ive cruise control system and
braking guard do not react to people , an­
ima ls, objects crossing the road o r on­
coming objects .
- The function of the radar sensors can be
affected by reflective objects such as
guard ra ils, the entra nce to a tunnel,
heavy rain or i ce.
- Never follow a veh icle so closely that you
cannot stop your vehicle safe ly. The
adaptive cruise cont ro l c anno t slow or
brake the veh icle safely when you follow
another vehicle too closely. Always re­
member that the automatic braking
funct ion cannot bring the veh icle to a
sudden or emergency stop under these
conditions .
- To prevent unintended operation, always
switch ACC off when it is not be ing used. (D Note
The sensors can be displaced by impacts or
damage to the bumper, wheel housing and
underbody. That cou ld affect the adaptive
cruise control system and brak ing guard .
Have your authorized Aud i dea le r or a u­
thorized Audi Serv ice Facility check their
funct ion.
In curves
Applies to vehicles: with Audi adaptive cruise control
I
F ig. 9 4 Exampl e: dri vin g in to a curve
When dr iving into a curve c:> fig. 94 and out of
a cu rve, the ad aptive cruise con trol m ay react
to a vehicle in the next lane and apply the
brakes . You can override or prevent the brak­
i ng by pressing the accelerator pedal b riefly.
Stationary objects
Applies to vehicles: with Audi adaptive cruise control
Fig. 95 Ex ampl e: object chang ing l anes and s ta tio nar y
objec t
The adaptive cru ise con tro l system only reacts
to objects that a re mov ing o r th at the system
has a lready detected as moving . For examp le,
if a veh icle @, which has a lready been detect-
ed by the adaptive c ruise contro l, tu rns o r
changes lane s and another stationary vehicle .,._

96 Audi adaptive cruise control and braking guard
@ is located in front of that vehicle, the sys­
tem will not react to the stationary vehicl e.
Audi adaptive cruise
control
Description
Applies to vehicles: with Audi adaptive cruise control
Fig. 96 Detectio n range
What can adaptive cruise control do?
The adaptive cruise control system uses video,
radar and ultrasou nd . Moving vehicles ahead
can be recognized up to about 650 feet (200 m) away.
On open roads w ith no traffic, adaptive cruise
control works like a regular cruise control sys­
tem . The stored speed is maintained . When
approaching a moving vehicle detected up
ahead, the adaptive cruise control system au­
tomatically s lows down to match that vehi­
cle's speed and then maintains the distance
that the driver previous ly stored. As soon as
the system does not detect a vehicle up
ahead, adaptive cruise control accelerates
back up to the stored speed.
In stop-and-go traffic, adapt ive cru ise control
can brake until the vehicle stops and acceler ­
ate again under certain conditions and if this
is possible within the system's limits and ca­
pabilities ¢
page 98. Adaptive cru ise control
will not make an emergency stop .
Which functions can be controlled?
When you switch adaptive cruise contro l on,
you can set the current speed as the "control speed" ¢
page 96, Swi tching on and off.
When driving, you can stop cruise control
¢
poge 98 or change the speed¢ page 97
at any time .
You can also set the distance to the object
ahead and set the adaptive cruise control driv­
ing program ¢
page 98.
Switching on and off
Applies to vehicles: with Audi adaptive cruise control
Fig. 97 Se le cto r lever: swit chin g on /off
Fig. 98 Instrume nt cl uste r: adapt ive cruis e cont rol
You can set any speed between 20 mph and
95 mp h (30 and 150 km/h) .
Ind icator lamps and messages in the instru ­
ment cluster d isplay inform you about the cur­
rent system status and settings .
Switching adaptive cruise control on
... Pull the leve r toward you into position (D
¢ fig. 97 . ACC standby appears in the in­
strument cluster display .
Setting the speed and activating
regulation
... To set the current speed, press the ISETI bu t­
ton ¢
fig. 97. T he set speed is shown in the
tachometer @and is a lso shown br iefly in
the display @¢
fig. 98 . ...,

Audi adaptive cruise control and braking guard 97
.. You must also press the b rake pedal when
the vehicle is stopped.
Switching adaptive cruise control off
.. Push the lever away from you into position
@ until it clicks into place. The message
ACC off appears.
@ Indicator lights
fl -Adaptive cruise control is switched on. No
vehicles are detected up ahead . The stored
speed is ma intained.
I -A moving vehicle is detected up ahead .
The adaptive cruise control system regulates
the speed and distance to the moving vehicle
ahead and acce lerates/brakes automatica lly.
f¥i -Adaptive cruise control is switched on. A
mov ing vehicle up ahead was detected . Your
veh icle remains stopped .
I· When automatic braking is not able to
keep enough distance to a previously detected
mov ing vehicle up ahead, you must take con­
trol and brake
c:::> page 99, Prompt for driver
intervention.
© Display
If adaptive cruise control is not shown in the
d isplay, you can call it up with the multifunc­
tion steering wheel buttons¢
page 24 .
Based on the symbols in the display, you can
determine if the system is maintaining a dis­
tance to the vehicle ahead and what that dis ­
tance is.
No vehicle -No vehicle ahead was detected.
White vehicle -A vehicle ahead was detected.
Red vehicle -Prompt for the driver to take ac­
tion
c:::> page 99.
Both
arrows o n the scale © indicate the dis­
tance to the vehicle ahead . No arrow appears
when the vehicle is on an open road and there
is no object ahead.
If an object is detected
ahead, the arrow moves on the scale.
The green zone on the scale shows the stored
distance. For information on changing the stored distance, refer to
c:::> page 98
. If the
distance selected is too close or may soon be­
come too close, the arrows move into the red
z one on the sca le .
A WARNING
Improper use of the adaptive cruise con­
trol can cause collisions, other accidents
and serious personal injuries.
- Pressing the
!SET ! button when driv ing at
speeds below 20 mph (30 km/h), w ill au­
tomatically accelerate the vehicle to 20
mph (30 km/h), which is the minimum
speed that can be set.
@ Tips
-If you switch the ignit ion or the adaptive
cruise control off, the set speed is erased
from the system memory.
- You cannot switch the Electronic Stabili­
zation Control (ESC) to the SPORT mode
when adaptive cruise control is switched
on.
Changing the speed
App lies to veh icles: w it h A ud i ada ptive c ruise co ntrol
0
f
• 0
Fig. 99 Selector lever: changing the speed
.. To increase or reduce the speed in incre­
ments,
tap the lever up or down.
.,. To increase or reduce the speed q uickly,
hold
the lever up or down until the red LED @
reaches the desired speed
c:::> page 96,
fig. 98.
Follow ing any changes, the new stored speed
will be displayed briefly in the display @
c:::> page 96, fig. 98.

98 Audi adaptive cruise control and braking guard
Driv ing in stop-and-go traff ic
A pplies to vehicles: with Audi adaptive cruise control
The adaptive cruise co ntro l system a lso as­
sis ts you in stop- and -go traff ic. If a previo us
detec ted veh icle ahead s tops, yo ur vehicle will
brake to a stop, within the limits o f the sys ­
tem .
,,. To res ume dr iv ing wi th adap tive cruise con­
t ro l, tap the accelerator pe dal or
,,. Pull the lever toward yo u into posit ion @
¢page 98 , fig. 100.
@ Tips
-If ada ptive cruise con trol is a ctive an d
you r vehicle does not start driving as ex­
pected after pulling the lever once, you
can start out aga in by tapp ing the accel­
erato r pedal.
- If an obstacle is detected when yo ur ve­
h icle starts dr iv ing, the system w ill
prompt you to take over
¢ page 99.
Your veh icle w ill drive more s low ly when
star ting . This may a lso happe n in some
s ituation s whe n no obstacle is apparent.
Interrupting cruise control
Applies to vehicles: with Audi adaptive cruise co ntrol
Fi g. 100 Selecto r lever
Requ irement : adaptive cruise control must be
sw itched on .
Overriding crui se control
,,. To accelerate ma nually, pull the lever to­
ward you into position @and hold it there .
The message
ACC override appears . Or
,,. press th e accelerator peda l. ,,.
To resume cruise cont ro l, re lease the lever
or take your foot off the accelerato r pedal.
Canceling cruise control while driving
,,. Move the lever in to posi tion @. T he mes­
sa ge
ACC standby ap pears. Or
,,. press the brake pedal.
,,. To resume the stored speed, move the lever
into position @.
Canceling cruise control when stopped
,,. Push the lever away from you i nto posit io n
@ . Th e message
ACC standby appe ars.
,,. To resume cruise contro l, press the brake
pedal an d pu ll the lever toward you into po­
sition @.
A WARNING
• -
Never resume the stored speed if the
sp eed is too high for p revailing r oad, traf­
f ic or weat her condit io ns.
Setting the distance
App lies to vehicles: wit h Audi ada ptive c ruise contro l
Fig. 101 Selector lever: setting t he dista nce
,,. Tap the switch to display the current set dis­
tance
r::!> fig. 101 .
,,. To increase or reduce the d istance by incre­
ments, tap the switch again to the left or
r ight. The d istance between the two vehicles
w ill change in the instrument cluste r dis­
p lay .
When approach ing a mov ing vehicle up ahead,
the adaptive cruise control system automati­ ca lly brakes to match that object's speed and
Ill>

Audi adaptive cruise control and braking guard 99
then maintains the stored distance. If the ve­
hicle ahead accelerates, adaptive cr uise con­
trol will also accelerate up to the stored
speed.
The higher the speed, the greater the distance
in yards (meters) ¢.&. . The
Distance 3 setting
is recommended .
The distances prov ided are spec ified values.
Depending on the driving situation and the
how the vehicle ahead is driving, the actual
d istance may be more or less than these tar­
get distances.
The various symbols for the time increments
appear briefly in the information line @
¢ page 96, fig. 98 when you change the set­
tings.
~ -~ --- Distance 1: This setting corre­
sponds to a distance of 92 feet/28 meters
when traveling at 62 mph (100 km/h), or a
time interva l of
l second.
~ -- ~-- Distance 2: This setting corre­
sponds to a distance of 118 feet/36 meters
when traveling at 62 mph (100 km/h), or a
time interva l of 1.3 seconds .
~--- ~-Distance 3: This setting corre ­
sponds to a distance of 164 feet/SO meters
when traveling at 62 mph (100 km/h), or a
time interva l of 1.8 seconds .
~---- ~ Distance 4: This setting corre ­
sponds to a distance of 210 feet/64 meters
when traveling at 62 mph (100 km/h), or a
time interva l of 2.3 seconds .
A WARNING
Following other vehicles too closely in­
creases the risk of collisions and serious
personal injury.
- Setting short distances to the traffic
ahead reduces the time and distance
available to br ing your vehicle to a safe
stop and makes it even more necessary
to pay close attention to traffic.
- Always obey applicable traffic laws, use
good judgment, and select a safe follow- ing distance
for the traffic, road and
weather conditions.
@ Tips
- Distance 3 is set automatically each time
you switch the ignition on.
- Your standard settings are automatically
stored and assigned to the remote con­
tro l key being used.
Selecting the driving mode
Applies to vehicles: with Aud i adapt ive c ruise contro l
.,. Select the desired driving mode in drive se­
lect¢
page 110.
(0 Tips
Your settings are automat ica lly stored and
assigned to the remote control key being
used.
Prompt for driver intervention
Applies to vehicles: with Audi adapt ive cru ise contro l
Fig. 102 Instrument cluster: request fo r drive r in ter­
vent ion
In certa in situations, the system will prompt
you to take action . Th is could happen, for ex­
amp le, if braking by the adaptive cruise con­
trol system is not enough to maintain enough
distance to the vehicle ahead.
The indicator light
I and the symbol in the
display will warn you about the situation
¢ fig. 102. You will also hea r an acoustic sig­
nal.
- Press the brake pedal to slow your vehicle
down.

100 Audi adaptive cruise control and braking guard
Audi braking guard
Descript ion
Applies to vehicles: with Audi adaptive cruise control
Fig . 10 3 Instrumen t cl uste r: approach warn ing
Braking guard uses radar sensors and a video
camera . It also functions within the lim its of
the system when adapt ive cruise control is
switched off .
What can braking guard do?
When detected in time, the system can assess
situations when a vehicle ahead brakes sud­
denly or if your own veh icle is traveling at a
h igh speed and approachi ng a veh icle up
ahead that is moving more slowly . Bra king
g ua rd does not react if it can not detect th e
situa tio n.
The system advises you of various situations:
- The
distance warning is given if you are too
close to the vehicle ahead for a long time. If
the vehicle ahead brakes sharply, you will not be able to
avoid a coll is io n. The indicator
li ght
I in the display comes on .
- The
approach warning is g iven when a de ­
tected veh icle up ahead in your lane is
mov ­
ing much more slowly than you are o r if it
brakes sha rply . W he n this wa rning is giv en,
it may only be poss ible to avoid a collisio n
b y swervin g or br aki ng sh arply . Th e ind ic ator
li gh t
I and indica to r i n the disp lay wi ll warn
yo u about t he danger ~
fig. 103. Yo u will a l­
so hear an acoustic signa l.
If yo u do not re act fa st enoug h or do not re act
at all to the si tuatio n, br aking gu ard will inte r-
ll Thi s is not ava ilable in some co un tri es .
vene by braking and the message braking
guard intervention
wi ll appea r.
- If a coll is ion is imm inent, the sy stem wi ll
fi rs t provide an
acute warning by br iefly and
sharply a pplying the brakes.
- If you do no t re act to the acu te w arning,
bra king g uard can brake w it h increas ing
force w it h in the lim its of the system . This
red uces the vehicle speed in the event of a
co llision.
- The system can initiate maximum b ra ki ng
short ly before a co llision
ll. Full dece leration
at high speeds occurs only in vehicles with
ada ptive cr uise control a nd side assist (pre
sense plus) .
- If the brak ing guard senses that yo u are not
brak ing hard en ough w hen a co llis ion is im­
m inent, it can increase t he b rak ing fo rce .
- The pre sense f unctions also engage whe n a
col lision is imm inent
c> page 197.
Which function s can be controlled?
You can switch braking guard and the dis­
tance/approach warning on or off in the M MI
c> page 101, Settings in the MMI.
A WARNING
-
Lack of attentio n can cause collisions, oth-
er accidents and serio us pe rsonal i nju ries.
Th e braking gua rd is an assist system and
c an not preve nt a collision by it self. T he
d rive r m ust always in tervene. The dr ive r is
a lway s respon sib le f or br aki ng at the cor­
r e ct t ime.
- Always p ay clos e atte ntio n to traffic,
even when the braking guar d is swi tched
on. Be ready to in te rvene and be re ady to
take c omp lete contro l whenever necessa­
ry. Always keep the safe and legal dis­
tance between your ve hicle and veh icles
up ahead.
- Bra king guard works within limits and
w ill not respond outside the system lim­
its, for examp le w hen approachi ng a
stopped vehicle or stationary obstacle ..,.

Audi adaptive cru ise control and brakin g guar d 101
(end of a traffic jam or veh icle t hat has
br oken down in traffic).
- Always remember that the radar sensor
for the b raking guard works only within
defined detection and ra nge limits that
may prev ent the proper det ection of oth­
er ve hicles.
- The ra dar 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 de­
tected at al l.
- Reflective surfaces includ ing crash barr i­
ers or tunnel ent rances may impair the
function of the radar sensor.
(0 Tips
- You can cance l the braking w ith increas­
i ng fo rce that is initiated by the system
by braking you rself, by accelerating no­
ticeab ly or by swerving.
- Brak ing guard error messages
<=> page 101.
-Keep in mind that braking guard can
brake unexpectedly. Always secure any
ca rgo or objec ts that you are transport ­
i ng to reduce t he risk of d amage o r in­
Ju ry.
Settings in the MMI
Applies to vehicles: with Audi adaptive cruise control
~ Se lect : ICARI function button> Car system s
control button > Driver assist > Audi brak­
ing guard .
S ystem -
Switch braking g ua rd On and Off .
When you sw itch the ignition on, the message
Audi braking guard off appears if the system
is switched off.
Early warning -The distance and approac h
warn ings in the display can be switched
On /
Off .
@ Tips
- Your settings are automatica lly stored
and assigned to the remote control key being used at the time the settings
are
made .
-If you res trict the E SC, the braking gua rd
also sw itches itself
off <=> page 201 .
-Swi tch braking guard off when you a re
loading the vehicle onto a veh icle carrier,
t rain, ship o r other type of transporta­
t ion . This can prevent undesired warn­
ings from the braking guard system.
Messages
Applies to vehicles: with Aud i adapt ive c ruise con tro l
Braking guard : off
T his dr iver message appears if the system is
turned off via the info tainment . Othe rwise, if
the system is turned off, the information ap ­
pears every time shortly after the start of the
trip.
T he driver message a lso appears if the system
is not ava ilable d ue to a malfunct ion or if the
ESC is not switched on<=>
page 201 . If this is
the case, the system w ill not prov ide warnings
about a poss ible collision.
Braking guard : activated
T h is dr iver message appears if sharp b rake
pressure was applie d due to an acu te warning.
ACC: Unavailable!
ACC and Audi braking guard: not available
The system cannot detect mov ing vehicles up
ahead correctly and is switched off . The sen­
sors have been displaced or are not working proper ly. The Audi pre sense functions may a l­
so be affected . Drive to your authorized Aud i
dealer or author ized Audi serv ice facility im­
med iate ly to have the malfunction cor rected .
ACC: currently unavailable. No sensor v is ion
ACC and b raking guide: cu rrentl y unavaila­
ble . No sensor vis ion
T h is mess age appears if the senso r view is ob­
structe d, for examp le by leaves, snow, heavy
spray or dirt. Clean the sensors
,=;,page 94,
rg .93 . ~

102 Audi adaptive cruise control and bra king guard
ACC : Currently unavailable . Gradient too
steep
T he road ex ceeds the maxim um poss ible an­
g le for proper adaptive cruise co ntrol opera ­
tion . Adaptive cruise control is sw itched off .
ACC: Only available in D, Sor M
Select the D/S or M selector lever position .
ACC: currently unavailable. Parking brake
appl ied
T he adaptive c ruise co ntro l system swi tc hes
off a utomat ica lly if t he pa rking brake is set.
ACC : Currently unavailable . Stability control
(ESC) input .
This message appea rs if the Elect ron ic Stabili­
z ation Cont ro l (ES C) is wo rking to help stabi­
l iz e the vehicle. In thi s case, a dap tive cru ise
con tro l sw itches o ff autom atically .
ACC off: Manual control!
This message appears whe n adapt ive cr uise
control can not set the par king b rake. Press
the brake peda l to prevent the vehicle from
rolling .
•••
Three w hite dots appear if a settin g can not be
se lected with the se lecto r lever. For example,
this happens if adapt ive cr uise control cannot
resume driv ing in stop-and-go traff ic because
one o f the conditions required for ACC to wor k
i s not present .
Door open
The adaptive c ruise control system c annot
switch on whe n a doo r is open .
Stationary object ahead
This message appea rs if you would like to
sw itch adaptive cru ise cont rol on and ther e is
a stat io na ry ve hicle o r obstacle directly ahead
of yo ur vehicle .