2015 AUDI A8 brake light

88 On the road
switched off. More force is required to
stop and to steer the vehicle.
- To reduce the risk of injuries, make sure
that the Start-Stop-System is turned off
when working in the engine compart­
me nt¢
page 89.
(D Note
Always switch off the Start-Stop -System
when driving through water ¢
page 89.
Starting/stopping the engine
Applies to vehicles: with Start-Stop-System
Fig . 91 In strument duster : eng ine switc hed off (stop
phase)
~ Slow the vehicle to a stop using the brake
and keep pressing the brake pedal. The en­
gine w ill switch off. The
11] indicator light
appears in the information line in the instru­
ment cluster display.
~ When you take your foot off the brake ped­
al, the engine restarts . The ind icator light
turns off.
Additional information
The engine w ill switch off in the P, D, N and S
positions as well as in manua l mode. In the P
position, the e ngine will also remain off if you
take your foot off the brake pedal. The engine
starts again when you select another se lector
lever position and take your foot off the brake
pedal.
If you select the R position during a Stop
phase, the engine will start again .
Shift from D to P quickly to prevent the engine
from starting unintentionally when shifting
through R. You
can determine for yourself if the engine
will stop or not by reducing or increasing the
amount of force you use to press the brake
pedal. For example, if you only lightly press
on the brake pedal in stop-and and-go traffic
or when turning, the engine will not switch off
when the vehicle is stationary. As soon as you
press the brake down harder, the engine wi ll
switch off.
General information
Applies to vehicles: with Start-Stop-System
The standard Start-Stop-mode can be cancel­
led for different system-related reasons.
Fig. 92 Instrument cluster: eng ine -Stop temporarily
unavailable
Engine will not switch off
Before each stop phase, the system checks if
certain conditions have been met. For exam­
ple, the eng ine will
not be switched off in the
following situations:
- The engine has not reached the minimum
requ ired temperature for Start-Stop-mode.
- The interior temperature selected by the A/C
system has not been reached.
- The outside temperature is extremely high/
low.
- The windshield is being defrosted
¢page 81.
-The parking system* is switched on.
- The battery charge level is too low.
- The steering wheel is sharply turned or
there is a steering movement.
- After engaging the reverse gear.
- On sharp incl ines.

The@j indicator light appears in the informa ­
tion line in the instrument cluster display
<:!)fig. 92 .
Engine automatically restarts
The stop phase is interrupted in the following
situations, for examp le. The engi ne restarts
without any action by the driver.
- Th e interior temperature varies from the
temperatu re selected in the A/C system.
- The windshield is being defrosted
r::!) page 81 .
-The brake pedal is pressed several times in a
row.
- The battery charge level becomes too low.
- High power consumption .
Switching the ignition off automatically
To prevent the battery from draining, the igni­
tion will switch off
automatically when all of
the following conditions have been met:
- The vehicle has al ready been driven.
- The eng ine has been turned off by the Start-
Stop-System*.
- The driver's door is opened.
- The driver's seat belt is removed .
- The brake pedal is not pressed down.
- The vehicle is stationary .
In this case, the activated low beam will be re­
placed by the side marker lights. The side
marker lights will switch off after approxi­
mately 30 minutes or when you lock the vehi­
cle .
If the Start-Stop System has
not turned off
the engine or if you have switched the Start­
Stop system off manually, the ignition w ill
not
be automatically switched off and the engine
will cont inue to run
r::!) .&. .
A WARNING
Never allow the engine to run in confined
spaces - danger of asphyxiation.
(D Tips
If you shift into the D, N or S positions af­
ter shift ing into reverse, the veh icle must
On the road 89
be driven faster than 6 mph (10 km/h) in
order for the engine to switch off again.
Switching the Start-Stop-System on/off
manually
App lies to vehicles: wit h Start -Stop -System
If you do not wish to use the system, you can
switch it off manually.
Fig. 93 Center console: Start -Stop -System button
.,. To switch the Sta rt-Stop-System off/on
manually, p ress the
ICA.> ••I button. The L ED in
the button turns on when the system is
sw itched off.
(D Tips
If you switch the system off during a stop
phase, the engine will start again auto­
ma tically .
Messages in the instrument cluster
display
Applies to vehicles: wit h Start-Stop-Syste m
Start-Stop system deactivated: Please re­
start engine manually
This message appears when specific condi­
tions are not met during a stop phase and the
Start-Stop-System will
not be able to restart
the engine. If the Dor R selector lever posi­
tions were engaged, P will be selected auto­
matically . The engine must be started with
the
I START ENGINE ST OP ! button.
Start-Stop system: System fault! Function
unavailable
There is a malfunction in the Start-Stop-Sys­
tem. Drive the vehicle to an authorized repair .,.

90 On the road
facility for servicing as soon as possib le to
correct the malfunction.
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 warn ing tone when
your speed exceeds the stored value by ap­ proximately 3 mph (3 km/h). An indicator
light. (USA models) . (Canada models) in
the instrument cluster display also turns on at
the same time. The indicator light./.
turns off when the speed decreases below the
stored maximum speed.
Sett ing a threshold is recommended if you
wo uld like to be reminded when you reach a
certain maximum speed . Situations where you
may want to do so include driving in a country
with a general speed limit or if there is a
specif ied maximum speed for winter tires.
@ Tips
Even though your vehicle is equipped with
a speed warning system, you should still
watch the speedometer to make sure you
are not driving faster than the speed lim it.
Setting the threshold
You can set, change and delete the threshold
in the MMI.
.. Se lect : ICAR lfunction button> Car systems
control button > Driver assist > Speed warn­
ing.
You can set any threshold between 20 mph
(30 km/h) and 150 mph (240 km/h). Settings
can each be adjusted in increments of S mph
(10 km/h).
Cruise control
Switching on
The cruise control system makes it possible to
drive at a constant speed starting at 20 mph (30kmlh) .
0
•
~
0
Fig. 94 Control leve r with set b utton
Fig. 95 Display: Se lected speed
.. Pull the lever to position (D c::> fig. 94 to
sw itch the system on.
.. Drive at the speed you wish to set.
.. Press button @ to set that speed.
T he stored speed and the indicator light
II (US models) ;El (Canadian mode ls) ap­
pear in the instrument cluster display
c::> fig. 95 . The display may vary, depending on
the type of display in your veh icle .
T his information is also shown briefly in the
Head-up Display*.
Th e speed is kept constant via an engine out­
put adjustment or active brake intervent ion.
WARNING
-Always pay attention to traffic even when
the cruise control is switched on. You are
a.lways respons ible for your speed and
Ill-

,....,
N ,....,
N
0 J:
'SI: ,...., \!) ..,.,
,...., ..,., ,....,
the distance between your vehicle and
other vehicles.
- For safety reasons, the cruise control
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, grave l, heavy rain and hydro­
planing) -risk of acc ident .
- Turn off the cruise control temporari ly
when entering turn lanes, highway exit lanes or in construction zones .
- Please note that inadvertent ly "rest ing"
yo ur foot on the accelerator peda l causes
the cruise control not to brake. This is
because t he cr uise con trol is overr idden
by the driver's acce le rat ion.
- If a brake system malfunction such as
overheat ing occurs when the cruise con­
t ro l system is sw itched on, the braking
f unction in the system may be switched
off. The other cr uise control f unctions re­
main active as long as the indicator light
II (US models) !Iii (Canadian mode ls)
is on.
The brake lights illuminate as soon as the brakes decelerate automat ica lly.
Changing speed
.,. To increase/decrease the speed in incre­
ments, tap the lever in the
010 d irection
i=> page 90, fig . 94 .
... To increase/dec rease the speed qu ickly, hold
the leve r in the
G) /0 direction unt il the de­
s ired speed is d isplayed.
You can also press the accelerato r pedal down
to increase your speed, e .g . if you want to
pass someone. The speed yo u saved earlier
will resume as soon as yo u release the acceler­
ator peda l.
I f, however, you exceed your saved speed by
6 mp h (1 0 km/h) fo r longe r th an 5 mi nutes,
the cruise cont ro l will tu rn off tempor arily.
The green symbo l
II (US models) !Iii i n the
On th e ro ad 91
display is rep laced w ith a wh ite symbo l. The
saved speed remains the same .
' Presetting your speed
You can preset your desired speed while the
vehicle is not moving .
.,. Switch o n the ign ition.
.,. Pull lever into posi tion
(D c:> page 90,
fig. 94 .
... Press the leve r in the 0 or 0 direction to
increase or decrease your speed.
.,. Release the lever to save that speed.
This function makes it possib le, for examp le,
to save the speed you want before driving on
the h ighway. Once on the highway, activate
the cru ise control by pulling the lever toward
(D.
' Switching the system off
Temporary deactivation
.,. Press the brake pedal, or
... Press the leve r in to position @(not clicked
into place)
~ page 90, fig . 94, or
.,. Dr ive fo r longe r than 5 mi nutes at mo re
t han 5 mph (10 km/h) above the stored
speed.
Switching off completely
.,. Press lever into position @(clicked into
place), or
.,. Switch t he ignit ion off.
T he system retains the saved speed if you de ­
activate the c ruise control temporar ily. To re­
sume t he saved speed, re lease the brake ped ­
al and p ull the leve r to po sition
(D .
Swi tch ing the ignit ion off e rases the saved
speed.
A WARNING
You sho uld only ret urn to the saved speed
if it is not too fast for the cur rent traffic
conditions -ris k of an accident!

Audi adaptive cruise control and braking guard 95
tachometer @and is also shown briefly in
thedisplay @c::>fig.101.
.. You must also press the brake 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
II-Adaptive cru ise contro l is switched on.
No vehicles are detec ted up ahead. The stored
speed is ma intained.
• -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 automatical ly.
fit -Adaptive cruise contro l is switched on. A
mov ing vehicle up ahead was detected. Your
vehicle remains stopped.
• -When automatic brak ing is not able to
keep enough distance to a previously detected
moving vehicle up ahead, you must take con­
trol and brake
c::> page 97, Prompt for driver
intervention.
© Display
If adaptive cruise control is not shown in the
d isp lay, you can call it up with the multifunc­
tion steering wheel buttons c::>
page 23.
Based on the symbols in the d isplay, you can
determine if the system is maintaining a dis­
tance to the vehicle ahead and what that d is­
tance is.
No vehicle · No veh icle ahead was detected .
White vehicle -A vehicle ahead was detected.
Red vehicle -Prompt for the driver to take ac­
tion
<=:> page 97.
Both
arrow s on 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 96. If the
distance selected is too close or may soon be­
come too close, the arrows move into the red
zone on the sca le .
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), will au­
tomatically accelerate the vehicle to 20
mph (30 km/h), which 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 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
Applies to vehicles: with Aud i adapt ive crui se control
0
f
• 0
Fig. 102 Selector lever: ch ang ing the speed
.. To increase or reduce the speed in incre­
ments,
tap the lever up or down.
-0:, N 0 ± ... a)
.. To increase or reduce the speed quickly, hold
the lever up or down until the red LED @
reaches the desired speed
c::> page 94,
fig.101. ~

Audi adaptive cruise control and braking guard 97
When approaching a moving vehicl e up ahead,
the adaptive cruise contro l system automati­
cally brakes to match that object's speed and
then maintains the stored distance.
If the ve­
hicle ahead accelerates, adaptive cruise 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 specified values .
Depending on the driving situation and the
how the vehicle ahead is driving, the actual
distance may be more or less than these tar ­
get distances.
The various symbols for the time increments appear briefly in the information line @
¢
page 94, fig . 101 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 interval of 1 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 interval 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 interval 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 interval of 2.3 seconds .
A WARNING
Following other vehicles too closely in­
creases the risk of collisions and serious
personal injur y.
- Setting short distances to the traffic
ahead reduces the time and distance
available to bring 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 d istance for the traff ic, road and
weather conditions .
(D 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
trol key being used.
Selecting the driving mode
Applies to vehicles: with Audi adaptive cruise control
.. Select the desired driving mode in dr ive se­
lect <=;>
page 108.
(D Tips
Your settings are automat ically stored and
assigned to the remote control key being
used.
Prompt for dr iver intervention
Applies to vehicles: with Audi adaptive cruise contro l
Fig. 105 Instrument cluste r: request fo r dr ive r inter­
vent ion
In certain situations, the system will prompt
you to take action . This could happen, for ex­
amp le, if braking by the adaptive cruise con­
trol system is not enough to maintain enough
distance to the veh icle ahead .
The indicator light . and the symbol in the
display will warn you about the situation
<=;> fig. 105. You will also hear an acoustic sig-
nal. ..,.

98 Audi adaptive cruise control and braking guard
-Press the brake peda l to slow your vehicle
down.
Audi braking guard
Description
Ap plies to vehicles: with Audi adaptive cruise co ntrol
Fig. 106 Instrume nt cluste r: approac h warn ing
Braking guard uses radar sensors and a video
camera. It also functions within the limits 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 vehicle is traveling at a
h igh speed and approaching a vehicle up
ahead that is moving more slowly . Brak ing
guard does not react if it cannot detect the
situation.
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 collis ion. The indicator
light. in the display comes on.
- The
approach warning is given when a de­
tected vehicle up ahead in your lane is mov­
i ng much more slowly than you are or if it
brakes sharply . When this wa rning is given,
it may only be possible to avoid a collision
by swerving or braking sharply. Th e indicator
li ght . and indicator in the display will
warn you about the danger~
fig. 106. You
will also hear an acoustic signa l.
ll This is not av ailable in some coun tri es.
If you do not react fast enough or do not react
at all to the situation, braking guard wi ll inter·
vene by braking and the message
braking
guard intervention
will appear.
- If a collision is imminent, the system wi ll
first provide an
acute warning by briefly and
sharply applying the brakes .
- If you do not react to the acute warning,
braking guard can brake wit h increas ing
force w ithin the limits of the system . This
reduces the vehicle speed in the event of a
collision.
- The system can initiate max imum brak ing
shortly before a collision
1> . Full deceleration
at high speeds occurs only in vehicles with
adapt ive cr uise control and side assist (p re
sense plus) .
- If the brak ing guard senses that you are not
braking hard enough when a collision is im·
minent, it can increase the brak ing force.
- The pre sense functions also engage when a
col lision is imminent ~
page 194.
Which functions can be controlled?
You can switch braking guard and the dis­
tance/approach warn ing on or off in the MMI
~ page 99, Settings in the MMI.
A WARNING
-
Lack of attention can cause collisions, oth-
er accidents and serious personal injuries .
The braking guard is an assist system and
ca nnot prevent a collision by itself. The
driver must always intervene. The driver is
a lways respons ible for braking at the cor­
rect time.
- Always pay close attention to traffic,
even when the braking guard is switched
on. Be ready to intervene and be ready to
take comp lete control whenever necessa­
ry. Always keep the safe and legal dis­
tance between your vehicle and veh icles
up ahead .
- Braking guard works within limits and
will not respond outside the system

,....,
N ,....,
N
0 J:
'SI: ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
Selector lever lock
The selector lever lock prevents you from se­l ecting a position unintentionally, causing the
vehicle to roll. When engaging some selector lever positions, you must press the button on
the selector lever
c:> fig. 124 and/or press the
brake pedal.
You must press the brake pedal to engage a
selector lever position when the engine is run­
ning while the vehicle is stationary. The ar­
rows
c:> fig. 125 indicate when you need to
press the button on the selector lever.
The selector lever does not lock if you shift
from D to R within one second. This allows
you to "rock" the vehicle to free it when it is
stuck.
P- Park
The whee ls are locked in this position. Only
shift into park when the vehicle is stationary
c:> &. To engage the P se lector lever position,
press the button on the selector lever and
shift into the P position .
You can only shift out of park when the engine is running and you are pressing the brake ped­
al. Press the button on the selector lever to
release the parking lock and select the desired
selector lever pos it ion .
P engages automatically when you switch the
engine off while D, Sor R is engaged or in
manual mode .
If you switch the engine off when N is engag ­
ed, the transmission remains in N for approxi­
mately 30 minutes and then Pis engaged.
You must use the emergency release proce­ dure to release the parking lock before towing
the vehicle
c:> page 119.
R -Reverse
The reverse gear is engaged in this position .
Only select reverse when the vehicle is sta ­
tionary and the engine is running at idle speed
c:> &. To engage the R selector lever position,
press the button on the selector lever, press
Automatic Transmission 115
the brake peda l and move the selector lever
into the R position.
T he back-up lights turn on when you select
the R selector lever position wh ile the engine
is running .
N -Neutral
The transmission is in idle in this pos it ion . To
engage the N selector lever posit ion, press
the button on the selector lever and shift into
the N position.
If you switch the eng ine off when N is engag­
ed, the transmission remains in N for approxi­
mately 30 minutes and then Pis engaged.
You cannot select the N position when the ig­
nition is switched off. When driv ing through
an automat ic car wash, first select the N posi ­
tion and then switch the engine off
c:> table on
page 216.
The veh icle cannot be locked when the selec­
tor lever is in the N position.
D/S - Posit ion for driv ing forward
In the D/S position, the transmission can be
operated either in the normal mode D or in
the sport mode S . You can only select the S se­
lector lever position when Dis engaged. Move
the selector lever back to engage the S selec­
tor lever position. To select the D selector lev­
er position again when Sis engaged, move the
selector lever back
c:> .&. . To shift from N to D
when traveling at speeds below 1 mph (2km/
h), press the brake peda l and select the D se­
lector lever position
c:> .&. .
In the normal mode D, the transmission auto ­
matically selects the suitable gear ratio.
It de­
pends on engine load, vehicle speed and driv­
ing style.
Se lect the
sport mode S for sporty driving.
The vehicle makes fu ll use of the engine's
power. Shift ing may become noticeab le when
accelerat ing.
The S selector lever position engages auto­
matically when you select the dynamic mode
in Audi drive select.
liJI,