2011 AUDI S8 brake

Depending on the weight of the r ig (vehicle
and trai ler) and the severity of the incline, you
may roll backwards as you start. You can pre­
vent roll ing backwards by holding the parking
brake switch(®) pulled out and accelerating -
just as you would when starting on a hill with
a conventional hand brake.
Emergency braking
In the event that the conventional brake sys­
tem fails or locks.
... In an emergency, pull the switch(®) and
continue to pull it to slow your vehicle down
with the parking brake.
... As soon as you release t he sw itch (®) or ac-
ce lerate, the braking p rocess stops.
If you pull the sw itch(®) and hold it above a
speed of about 5 mph (8 km/h), t he emergen­
cy braking fu nction is in itiated . The vehicle is
b raked at all four wheels by activating the hy­
d ra u lic bra ke system. The b rake performance
i s simi lar to making an emergency stop
c::> &. .
In order not to activate the emergency brak­
ing by m ista ke, an audible warning tone (b uz­
z er) sou nds when the switch®> is pulled. As
soon as the switch(®) is released, or the acce l­
erator pedal is dep ressed, emergency brak ing
stops .
A WARNING
Emergency braking should only be used i n
an emergency, when the normal foot brake
has failed or the brake pedal is obstructed.
Using the parking brake to perform emer­
gency braking will slow you r vehicle down
as if you had made a fu ll brake applicat ion.
T he laws of physics can not be s uspended
even w ith ESP and its associated compo­
nents (ABS, ASR, EDL). In corners and
when road or weather conditions are bad,
a full brake application can cause the vehi­
cle to skid or the rear end to break away -
r isking an accident.
On th e ro ad 83
Speed warning system
Introduction
The speed warning system helps you to stay
under a specified maximum speed .
The speed warning system warns you if you
are exceeding the maximum speed that you
have set. You will hear a warning tone when
you r speed exceeds the stored value by ap­
proximately 3 mph (3 km/h) . An indicator
li ght . (USA
models) ;a (Canada mode ls) in
the instr ument cluster d isp lay al so tur ns on at
the same time. The indicator light . /.
turns off when the speed decreases be low the
stored maxim um speed .
Se tting a t hreshold is recommended if you
would like to be rem inded w hen you reach a
certain maximum speed. Situations where you
may want to do so incl ude driv ing in a co untry
with a genera l speed limit or if there is a
specified maximum speed for winter tires.
(D Tips
Even though your vehicle is eq uipped w ith
a speed warn ing system, you sho uld still
watch the speedometer to make sure you
are not dr iv ing faster than the speed limit.
Setting the threshold
You can set, change and delete the threshold
in the MMI.
... Select: !CAR ! function button > Car systems
contro l button > Dri ver ass ist > Speed warn­
ing .
You can set any threshold between 20 mph
(30 km/h) and 150 mph (240 km/h) . Sett ings
can each be adjusted in increments of 5 mph
(10 km/h).

84 On the road
Cruise control
Switching on
The cruise control system makes it possible to
drive at a constant speed starting at 20 mph
(30 km/h).
0
f
®t
0
Fig. 83 Control lever w it h set butt on
Fig . 84 D is pl ay: Selected speed
"' Pull the lever to position (D c::> fig. 83 to
switch the system on.
"' Drive at the speed you wish to set.
"'Press button@to set that speed .
I :i:. ... a,
The stored speed and the ind icator light
[ij;W~1~ (US models) / 0 (Canadian models) ap ­
pear in the instrument cluster display
c:;, fig. 84 . The display may vary, depending on
the type of display in your vehicle . The indic a­
tor light . in the instrument cluster also illu­
minates.
The speed is kept constant
via an engine out­
put adjustment or active brake intervention .
8_ WARNING
-Always pay attention to traffic even when
the cruise control is switched on . You are
always responsible for your speed and
the distance between your vehicle and
other vehicles. -
For safety reasons, the cruise contro l
should not be used in the city, in stop­
and-go traffic, on twisting roads and
when road conditions are poor (such as ice, fog, gravel, heavy rain and hydro­
plan ing) - risk of accident.
- Turn off the cruise control temporarily when enter ing turn lanes, highway exit
lanes or in construction zones .
- Please note that inadvertently "resting" your foot on the accelerator pedal causes
the cruise control not to brake. This is
because the cruise control is overridden
by the drive r's acceleration.
- If a brake system malfunction such as
overheating occurs when the cruise con­
trol system is switched on, the braking
function in the system may be switched
off . The other cruise control functions re­
main active as long as the indicator light
m:lmi (US models)/ . (Canadian mod­
els) is on.
(D Tips
The brake lights illuminate as soon as th e
brakes decelerate automatically.
Changing speed
"' Press lever in the 0 or O direction
c::>page 84, fig. 83 to increase or decrease
your speed.
"' Release the lever to save that speed .
Change speed in increments of 1 mph (1 km/
h) by lightly press ing the lever. If you keep the
lever pressed down , you will alter your speed
in 5 mph (10 km/h) increments .
You can also press the accelerator pedal down
to increase your speed, e .g. if you want to
pass someone . The speed you saved earlier
will resume as soon as you release the acceler­
ator pedal.
If, however, you exceed your saved speed by
6 mph (10 km/h) for longer than 5 minutes,
the cruise control will turn off temporari ly.
The green symbol in the display
c> page 84, .,..

fig. 84 is replaced with a white symbol. The
saved speed remains the same.
Presetting your speed
You con preset your desired speed while the
vehicle is not moving .
.,. Swit ch on the ignition .
.,. Pull lever into posit ion @ ~
page 84,
fig . 83 .
... Press the lever in the 0 or 0 direction to
increase or decrease your speed .
.,. Re lease the lever to save that speed.
This function makes it possible, for example,
to save the speed you want before driving on
the highway . Once on the highway, activate
the cruise control by pull ing the lever toward
@.
Switching the system off
Temp orar y de activation
.,. Press the brake pedal, or
... Press the lever into pos it ion @ (not clicked
into p lace)
c:;, page 84, fig . 83, or
.,. Drive for longe r than 5 minutes at more
than 5 mph (10 km/h) above the sto red
speed.
Switching off compl etely
.,. Press lever into position @(clicked into
place), or
.,. Switch the ign ition off.
The system reta ins the saved speed if you de ­
activate the cr uise control tempo rarily . To re­
sume the saved speed, release the brake ped­
a l and pull the lever to position@.
Sw itch ing the ign ition off erases the saved
speed .
A WARNING
You should only return to the saved speed
if it is not too fast for the current traffic
condi tions - risk of an ac ciden t!
On th e ro ad 85

86 Adaptive cruise control and braking guard
Adaptive cruise control
and braking guard
Introduction
Applies to vehicles: with adaptive cruise co ntrol
The adaptive cruise control system assists the
driver by regulating 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.
Audi braking guard can warn you about an im­ pending collision with a vehicle up ahead that
is slower or has slowed down and start slow­
ing your vehicle down with the brakes
<::> page 92.
Adaptive cruise control and Audi Braking
Guard have technical limitations that you
must know, so please read this section care­
fully, understand how the system works and
use them properly at all times.
General information
General information
Applies to vehicles: with Adapt ive cruise contro l
Fig. 85 Front of th e ve hicle : senso rs a nd video camera
The areas that contain the radar and ultrason­
ic sensors and the video camera
c::> fig . 85
must never be covered by stickers, or other
things or coated with dirt, insects, snow or ice
that will interfere with the Adaptive cruise
control system and Audi braking guard . Re­
move snow with a hand brush and remove ice with a de-icing spray that does not contain
solvents.
The function of the Adaptive cruise control
system and Audi braking guard is limited un­
der some conditions.
- Objects can only be detected when they are
within sensor range
c::> page 88, fig. 88 .
-The system has a limited ability to detect
objects that are a short distance ahead, off
to the side of your vehicle or moving into
your lane from the front or moves into your
lane from the side.
- When driving through curves
r=;> page 87.
-Some kinds of vehicles are hard to detect;
for examp le motorcycles, vehicles with high
ground clearance or overhanging loads mab
be detected when it is too late or they may
not be detected at all.
- Stationary objects
c::> page 87.
A WARNING
Improper use of the adaptive cruise con­
trol can cause collisions, other accidents
and serious personal injury. -
-Never let the comfort and convenience
that adaptive cruise control and Audi
braking guard offer distract you from the
need to be alert to traffic conditions and
the need to remain in full control of your
vehicle at all times,
- Always remember that the adaptive
cru ise control and Audi braking guard
have lim its -they will not slow the vehi­
cle down or maintain the set distance
when you drive towards an obstacle or
something on or near the road that is not
moving, such as vehicles stopped in a
traffic jam, a stalled or disabled vehicle.
If registered by the radar sensors, vehi­
cles or obstacles that are not moving can
trigger a collision warning and if con­
firmed by the video camera, an acute col­ lision warning.
- Always remember that the adaptive
cruise control cannot detect a vehicle
that is driving towards you in your traffic
lane and that it cannot detect narrow
~

Adaptive cruis e control and bra kin g guard
vehicles such as motorcycles and bicy­
cles.
- The adaptive cruise control system can­
not detect people, animals and cannot
detect objects or traffic that crosses your
lane of travel.
- Never drive at speeds that are too fast for traffic, road and weather conditions.
- Never use adaptive cruise control when
you cannot drive safely at a steady speed, including on wind ing roads or
when road conditions are poor (for exam ­
ple, in construction sites, on ice , gravel,
in fog, heavy ra in or on wet roads that in­
crease the risk of hydroplan ing).
- Never follow a veh icle so closely that you
cannot stop your vehicle safely. The
adaptive cruise cont ro l cannot slow or
brake the veh icle safely when you follow
another veh icle too closely. Always re ­
member that the automatic braking
function cannot bring the vehicle to a
sudden or emergency stop under these
condit ions.
- Never rest your foot on the acce lerator
pedal, especially when the adaptive
cruise control is being used. Pressure on
the accelerator w ill override the adaptive
cruise control braking function and pre­
vent the brakes from being applied whe n
adaptive cruise cont ro l detects a situa­
t io n when the brakes must be applied.
- Never use adaptive cruise control whe n
the radar sensors cannot accurately de­
t ect vehicles moving in t raff ic. The rad ar
sensor's vision can be reduced by heavy
rain, ice, snow, heavy road spray and re­
flect ions from guard rails, t unnel ent ran­
ces, etc. These and simi lar conditions can
prevent vehicles from being accurately
detected and in some cases they may not
be detected at all .
- Always turn off adaptive cru ise contro l
when entering turn lanes, exit lanes and
constr uction zones or in similar sit ua­
t ions because the vehicle will automati­
ca lly accelerate to the sto red speed when
the roa d ahead is clear. -
To prevent unintended operation, a lways
sw itch ACC off when it is not being used .
(D Note
The sensors can be moved by impac ts or
damage to the bumper, wheel housing and underbody . Damage in these areas could
change the way the adaptive cru ise control
system and Aud i brak ing guard work to­
gether . Have your authorized Audi deale r
check to make s ure that the adaptive
cruise control system is wor king p roperly if
your vehicle had a m ino r frontal impact or
was damaged in the area of the sensors.
In curves
Applies to vehicles: wi th adaptive cruise control
Fi g. 86 Exa mpl e: dri vin g into a curve
When dr iving into a curve¢ fig. 86 and out of
a curve, the adaptive c ruise control may react
to a vehicle in the next lane and app ly the
brakes . You c an override or preven t the brak­
ing by pressing the accelerator pedal b riefly .
Stationary objects
Applies to vehicles: wit h adaptive cruise control
Fig. 87 E xam ple: object c hanging l anes a nd s tationa ry
o ~ect
~
8 7

88 Adaptive cruise control and braking guard
The adaptive cruise control system on ly reacts
to objects that are moving or that the system
has already detected and reg istered as mov ­
ing.
Adaptive cruise control
Description
Ap plies to vehicles: with a daptive cruise co ntrol
Fi g. 88 Detect io n ra nge
What c an adaptive cruise control do?
The adaptive cruise control system uses video,
radar and ultrasound. Mov ing vehicle ahead
can be recognized up to about 650 feet (200 m) away .
On open roads w ith no traffic, adaptive cruise
control wo rks like a regu la r cruise control sys­
tem. The stored speed is maintained. When
ap proaching a moving vehicle de tected up
a head, t he adapt ive cr uise control system au­
tomatically s lows dow n to ma tch that vehi­
cle's spee d and then ma in tain s th e d istance
that the driver previo usly s to red. As soon as
the system does not de tect a vehicle up
ahead, adaptive c ruise control acce lerates
bac k up to the stored speed.
I n stop-and-go t raffic, ada ptive cr uise con tro l
can brake unt il t he vehicle stops i f th is is pos ­
sib le w ith in the systems' limits and capabili­
ties. ACC will not make an emergency stop.
Pull the lever <=>
page 88, fig. 89 towards
you into position @to reactivate ACC, the ve­
h icle w ill move forward when t he vehicle in
fro nt o f you s tarts moving aga in . You can also
depr ess the accelerator to move forwa rd
again <=>
page 89.
Which functions can be controlled?
When yo u swi tc h a dap ti ve cr uise control on,
yo u c an set the c urrent speed as the "cont ro l
s p eed " <=>
page 88, Switching on and off.
When dr iving, yo u ca n stop cru ise co ntrol
¢ p age 90 or ch ange t he spee d ¢ page 90
at any time .
You can also se t the dis tance to t he object
ahead and set the ad apt ive cr uise con tro l d riv­
ing progr am
¢page 91.
Switching on and off
Applies to vehicles: wi th adaptive c ruise contro l
Fig. 89 Ope rati ng lever: swit c hin g on/off
Fig . 90 Instrument clus te r: adap tive cruise control
You can set any speed between 20 mp h and
95 mp h (30 and 150 km/h) .
Switching adaptive cruise control on
... Pull the lever toward you into position (D
¢ fig. 89. ACC standby appears in t he in­
strument cluste r display.
Setting the speed and activating
regulation
... To set the c urrent speed, press the ISETI but­
ton ¢
fig. 89. The set speed is shown in the
tachometer @and in the display¢
fig . 90 . ..,_

Adaptive cru ise co ntrol and b rakin g guar d 89
You must also press the b rake pedal when
the vehicle is stopped.
Sw itching adapti ve cruis e co ntrol off
~ Push the lever away from you into position
@ until it clic ks into p lace. The message
A CC off appears.
I ndicator lamps and messages in the instru­
ment cluster display inform you about the c ur­
rent system status and settings.
@ Indic ator light s
fl-adaptive cruise control is sw itched on . No
veh icles are detected up ahead . The stored
speed is ma inta ined.
I -A moving vehicle is detected up ahead .
The adaptive cruise control system regulates
the speed and distance to the moving veh icle
ahead and accelerates/brakes automat ically.
f:i -adaptive cru ise control is switched on. A
mov ing vehicle up ahead was detected. Your
veh icle remains stopped and will not start
driving automatically.
I -When automat ic braking is not able to
keep enough distance to a previously detected
mov ing vehicle up ahead, you must take con­
trol and brake¢
page 90, Prompt for driver
intervention.
© Di splay
If adaptive cruise control is not shown in the
d isplay, you can call it up with the multifunc­
tion steering wheel buttons
¢ page 23 .
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 d is­
tance is .
No v ehicle -No vehicle ahead was detected.
White vehicle -A vehicle ahead was detected .
Red ve hicl e -Prompt for the d river to take ac­
tion
¢ page 90.
Both arr ow s on the scal e© indicate the dis­
tance to the vehicle ahead . No ar row 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 .
T he green zone on the sca le shows the stored
distance. For informat ion on changing the
stored distance ¢
page 91. If the distance
selected is too close or may soon become too
close, the arrows move into the red zone on
the scale .
A WARNING
Improper use of the adaptive cruise con­
trol can cause collisions, other accidents
and serious personal injur ies .
- 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), wh ich is the minimum
speed that can be set .
(D Tips
- If you switch the ignit ion or the adaptive
cruise control off, the set speed is e rased
from the system memory.
- You cannot switch the Electron ic Stabili­
zation Program (ESP) to the SPORT mode
when adaptive c ruise control is sw itched
on.
Driving in stop-and-go traffic
Appl ies to vehicles: wi th adap tive c ruise control
T he adaptive cru ise contro l system also as­
sists yo u in stop-and-go traffic. If a previous
detected vehicle ahead stops, your vehicle wi ll
brake to a stop, within the limits of the sys­
tem.
~ To resume driving with adaptive cruise con­
trol, tap the acce lerator pedal or
~ Pull the lever toward you into position @
¢ page 88, fig. 89.
(D Tips
- If adaptive cruise control is act ive and
your vehicle does not start driving as ex­ pected after pu lling the lever once, you
can start out again by tapping the acce l-
erator peda l. ..,.

90 Adapti ve crui se control and braking gu ard
- If an obstacle is detected when your ve ­
hicle starts driving, the system will
prompt you to take over~
page 90.
Your vehicle w ill drive more slow ly when
starting . This may also happe n in some
situations when there no obstacle is ap ­
parent .
Interrupting cruise control
Applies to vehicles: with adaptive cruise control
Requi rement : adaptive cruise control must be
switched on.
Overriding cruise control
... To accelerate manually, pull the lever to­
ward you into position@~
page 88, fig. 89
and hold it there . The message ACC ove rri de
appears. Or
... press the accelerator peda l.
... To resume cruise control, release the leve r
o r take your foot off the acce le rator pedal.
Canc eling cruise control while driving
... Move the lever into posit ion @. The mes­
sage
ACC standb y appears . Or
... press the brake peda l.
... To resume the stored speed, move the lever
into position @.
Canceling cruise control when stopped
... Push the lever away from you into position
@ . The message
ACC standb y appears .
... To resume cruise control, press the brake
peda l and pull the lever toward you into po­
sition @.
A WARNING
Improper use of the adaptive cruise con­
trol can cause collis ions, other acc idents
and ser io us personal injuries.
- Never resume the stored speed if the
speed is too high for preva iling road,
traffic or weather conditions .
-
Prompt for driver intervention
Applies to vehicles: with adaptive cruise contro l
Fig. 91 Inst ru m en t cl ust er : req ues t fo r dr ive r in te rv en­
ti on
In certa in situations, the system will p rompt
you to take action . Fo r example , braking by
the adaptive cr uise control system is not
enough to maintain enough distance to the
vehicle ahead .
T he ind ic a tor light
I and the symbol in the
display will warn you abo ut the s ituation
r::!> fig. 91 . You wi ll also hear an acoustic signal.
- Press the brake pedal to slow your vehicle
down.
Changing the speed
Applies to vehicles: with adaptive cruise control
0
f
• 0
Fig. 92 Operating leve r: c ha ngi ng the speed
... To increase or reduce the speed in incre ­
ments,
tap the lever up or down .
... To increase or reduce the speed quick ly,
h o ld
the lever up o r down un til the red LED@
reaches the desired speed
r::!> page 88,
fig. 90.