2018 AUDI A4 brake

Assistance systems
Switching off completely
.. Press the leve r into posit ion @ (clicked into
place), or
.. Switch the ignition off.
The speed yo u sto red w ill be mainta ined if the
cru ise control has been switched off tempora rily.
To resume the stored speed, release the brake or
clutch pedal and pu ll the leve r into position
(D.
Sw itching the ign ition off will erase the stored
speed.
A WARNING
You shou ld only resume the stored speed if it
is not too high for existing traffic cond itions.
Otherwise you can increase the r isk of an acci­
dent.
Camera-based traffic
sign recognition
Description
Applies to: veh icles with camera-based traffic sign recogni·
tion
Fig. 104 Inst rumen t cluster: traffic sign recognition
Fig. 105 Windsh ield: camera window fo r tra ffic sign recog ­
nit ion
104
Traffic sign recognition assists you when driving
by displaying detected speed limits or signs pro­
hibiting passing in the instrument cluster display
¢ fig. 104. Within the limits of the system, the
legal speed limits in schoo l zones are detected
and displayed .
General information
Traffic sign recognition can detect standard
speed limit signs that are within the camera's vis­
u al field. With assistance from navigation data,
detected speed limits are evaluated and shown in
the d isplay. The traffic s ign for the current de­
tected speed lim it will blink in the display if you
exceed the warning threshold set in the Infota in­
ment system
¢ page 1 OS.
Th e traffic sign recognition is subject to certa in
system limitat ions and may be unava ilable or on­
l y part ially ava ilab le in the follow ing s ituations:
- when visibility is poor, such as in snow, rain,
fog or heavy spray
- when there is glare, for example from oncom­
ing traffic or the sun
- at high speeds
- if the camera's visual
field¢ fig. 105 is covered,
for examp le by dirt or stickers. For information
on cleaning,
see¢ page 354
- if the traffic signs are completely or partially
covered, for examp le by trees, snow, dirt or
other vehicles
- if speed traffic signs do not conform to the
standards
- if traffic signs are damaged or bent
- if traffic signs are displayed on sign holders
with electronic signs
- if the traffic signs o r the config uration of the
road have changed (navigation data is no lon­
ger up-to-date)
_& WARNING
Pay attention to traffic and the area around
your vehicle when traff ic sign recogn ition is
turned on . The traffic s igns installed on the
road always take precedence over the display .
The drive r is always responsible for assessing
the traffic situation.
-

Assistance systems
-No messages are displayed when at speeds
under
20 mph (30 km/h) .
Settings in the Infotainment system
Appl ies to: ve hicles w ith predi ctive e fficiency assis t
~ In the Infotainment system, select: IMENUI
button > Vehicle > left control button > Driver
ass istance
> Eff icie ncy assist .
Predictive messages are shown when this f unc­
tion is sw itched on.
(D Tips
No predictive messages are shown on vehicles
w ithout a navigation system .
Audi adaptive cruise
control
Description
A ppl ie s to: ve hicles w ith Audi adaptive cruise co ntro l
Fig. 107 Detect ion range
The adaptive cruise control system is a combina­
tion of speed and distance regulation.
It assists
the dr iver by both regulating the speed and
maintaining a distance to the vehicle driving
ahead, within the limits of the system . If the sys­
tem detects a vehicle driving ahead, the adaptive
cru ise control can brake and acce lerate your vehi­
cle. This increases driving comfort dur ing long
tr ips on highways and in stop-and -go traff ic (au ­
tomatic transmission*).
What can adaptive cruise control do?
The adaptive cruise contro l system uses video, ra­
dar, ultrasound and navigation data. Veh icles
108
driving ahead can be recognized up to 650 feet
(200 m) away.
P red ictive functions offer the driver additional
comfort and contribute to the reduction in fue l
consumption and CO2 emiss ions
r:!> page 115.
On open roads with no traffic , it functions like a
c ruise control system. The stored speed is main­
tained . When approaching a vehicle driving
ahead, the adaptive cruise contro l system auto­
matically brakes to match that vehicle's speed
and then maintains the set distance . As soon as
the system does not detect a vehicle dr iving
ahead, adaptive cruise control accelerates up to
the stored speed.
App lies to: vehicles wit h auto matic transmissions
In stop-and-go traffic, adaptive cruise control can
brake until the veh icle is stationary and then can
also start driving again automat ically under cer­
ta in cond itions
r:!> page 112 .
In traffic jams or s top-and-go traffic, traffic jam
ass ist can ass ist the driver
r:!> page 116.
Which functions can be controlled?
When you switch adapt ive cru ise control on, you
can set the current speed as the "contro l speed"
r:!> page 110, Switching on/off.
When dr iving, you can stop cruise control
c:>page 113 or change the speed c::;,page 112 at
any time .
You can also set the distance to the vehicle driv­ i ng ahead and set the driving mode of the adap­
tive cru ise cont rol
c::;, page 113 .

General information
Appl ies to: ve hicles with Audi adaptive cruise contro l
Fig. 108 Fro nt of the vehicle: sensors and video camera
The areas with the radar and ultrasonic sensors
and the video camera
c:> fig . 108 must not be cov ­
ered by stickers, deposits or any other objects, because this can inte rfere with the adaptive
cr uise control funct ion. For information on clean­
ing, see
c:> page 354 . The same app lies for any
modifications made in the front area.
In some d riving situations, the adaptive cru ise
control funct ion is restr icted:
- Vehicles can only be detected when they are within the sensor detection zones
c:> page 108,
fig. 107.
- The system has a limited abil ity to detect
vehicles that are a short distance ahead, off to
the side of your vehicle or moving into your
lane .
- Objects that are difficult to detect such as mo­
torcycles, vehicles with high ground clearan ce
or an overhanging load are detected late or not dete cted at all.
- When driving through curves
c:> page 110 .
-When the vehicle is stat ionary c:> page 110.
..&, WARNING
Always pay attent ion to the traffic aro und you
when adap tive cruise contro l is swi tched o n.
As the driver, you are s till responsible for your
own speed and the distance to other vehicles .
The adaptive cruise control is used to assist
you. The driver must a lways take action to
avoid a collision. The driver is a lways responsi­
ble for brak ing at the correct time.
A ss is ta nce syst ems
-For safety reasons, do not use adaptive
cru ise control when the road surface is in
poor condition and/or in bad weather condi­
tions (such as ice, fog, gravel, heavy rain and
hydroplaning). Using the system under
these conditions increases the r isk of an ac­
cident.
- Sw itch adaptive cruise control off tempora­
rily when dr iv ing in turning lanes, on ex­
p ressway ex its (except if predictive con trol
is switched on) or in const ruct ion zones.
This prevents the vehicle from acce lerating
to the stored speed when in these situa­
tions.
- The adaptive cruise contro l system will not
brake by itself if you put your foot on the ac­
celerator pedal. Doing so can override the
speed and distance regulation.
- When approaching stationary obstacles
such as stopped traffic, adaptive cruise con­
trol will respond with limited function.
- Adaptive cr uise control does not respond to
peop le, animals, or crossing or oncoming
objects.
- The funct ion of the radar sensors can be af­
fected by reflective objects such as guard rails, the entrance to a tunnel, heavy rain or
ice.
(D Note
The sensors can be displaced by impacts or
damage to the bumper, wheel housing and underbody. This can impair the adaptive
cruise control. Have an authorized Audi dealer
or authorized Audi Service Facility check
the ir
f u nct ion.
(D Tips
For an explanation on conformity with the
FCC regulations in the United States and the
Industry Canada regu lations, see
c:> page 38 6.
109

Assistance systems
In curves
Applies to: vehicles w ith Audi adaptive cruise co ntro l
Fig. 109 Example: dr iv ing into a curve
When driving into a curve ¢ fig. 109 and out of a
curve, the adaptive cru ise control may react to a
veh icle in the neighboring lane and apply the
brakes. You can prevent that by pressing the ac­
celerator pedal briefly.
Stationary vehicle s
Applies to: ve hicles with Audi adaptive cruise co ntro l
F ig . 110 Example: veh icle c hanging lanes and stationa ry
ve hicle
Within the limits of the system, adaptive cruise
control can react to stationary vehicles
¢
fig. 110, as long as you are driving slower than
30 mph (SO km/h) and the system class ifies the
possible passing maneuver as low. For example,
if a vehicle that was already detected
@ turns or
changes lanes, the adaptive cruise contro l reacts
to the stat iona ry vehicle ahead of
it @ .
110
Veh icles with manual transmission
App lies to : vehicles wit h Audi adapt ive cruise control and
manual t ra n smi ssio n
The adaptive cru ise control is available from 1st
gear through 6th gear in the normal speed
range.
When the adaptive cruise contro l is turned on,
you must press the clutch to shift gears (as usu­
al). When sh ift ing normally or when pressing the
clutch, the adaptive cruise control remains
turned on.
After you have engaged the gear, you do
not
need to press the gas pedal. The adaptive cru ise
contro l accelerates automat ically if necessary .
If you press down on the clutch for too long or
shift/couple improper ly, the adaptive cruise con­
trol may turn off automatically .
Switching on/off
Applies to: vehicles with A ud i adapt ive cruise control
Fig. 111 Ope rating leve r: sw itching on and off
Fig. 112 Instrument cl uste r: adapt ive cr uise cont ro l
You can set any speed between 20 and 95 mph
(30 and 150 km/h).
.,._

a co .... N ,....
N .... 0 0
3 co
In d ic at or ligh ts and messages in the instr ument
cluster display inform you about the current sit ­
uation and setting.
A n ad dit iona l in di ca tor appears in the head -up
d isp lay*.
Switching adaptive cruise control on
" Pull the lever toward you in to posi tion @
¢fig. 111.
Storing the speed and activating regulation
" To store the cu rrent speed , press the ISET ! but­
ton
¢ fig . 111 . The stored speed is shown in the
speedomete r in the LED
line @ and appears
br iefly i n the status
line @¢fig . 112 .
"Applies to: vehicles with automat ic transmis­
s ion: To acti va te the cont ro l when st ation ary,
also press the bra ke peda l.
Switching adaptive cruise control off
" Push the lever away from you in to posi tion @
u nti l it clicks into place. The message ACC:
off
appears.
@ Indicator lights
fll-Adaptive cru ise con trol is switched on . No
ve hicles are detected ahead. The stored speed is
m ain tained .
•-A vehicle d rivi ng a head was detected. The
adapt ive cr uise control system regulates the
speed and distance to the veh icle dr iv ing ahea d
a n d accelerates/brakes automatically .
• - Automatic transmission: adaptive cruise
control must be sw itched on . A veh icle was de­
tec ted ahead . Yo ur vehicle is s tat io nary and w ill
n ot sta rt driving au tomatically .
tii-Automatic transmission : adaptive cruise
control must be sw itched on . No vehicles were
detected ahead . Your veh icle is stationary a nd
w ill no t start dr iv ing automa tica lly .
• -The automatic braking is not enough to
maintain a sufficient distance to a veh icle dr iv ing
ahead . You must
in tervene ¢ page 114, Driver
intervention request .
Assistance systems
© Instrument cluster display
If the Driver assistance di spl ay is not shown in
t h e instr ument cluster d isp lay, you can open it
u sing the m ultif unct ion steering whee l buttons
¢ page 13.
Ba sed on the gr aphic dis pla y, you can dete rmine
i f th e sys tem is maintain ing a d istance to the ve ­
hicle d riving ahead a nd what t hat distance is .
No vehicle -no vehicle was detec ted dr iv ing
ahe ad.
Silver vehicle -a vehicle was detected driving
ahea d.
Red veh icle -request for drive r interve ntion
¢ page 114.
The five distance bars on the gauge © represent
t h e set distance (refer
to ¢ page 113 for infor­
mation o n how to change the d ista nce). If you
fall be low the selected d ista nce, the distance
bars become red from the bo ttom upwa rd.
.&, WARNING
Applies to: vehicles w ith automatic transm is­
sion: If you pre ss t he
I SET ! butt on whe n driv­
i ng at speeds below 20 mp h (30 km /h) , the
ve hicle accelerates au toma tic ally up to 20
mph ( 30 km/h), which is the m inimum speed
that can be set.
@ Tips
- If you swit ch the ig nitio n or the ad ap tive
c ruise cont rol sys tem o ff, the set s peed is
erased fo r safety reasons .
- The e lec troni c sta biliz ation control ( ESC)
and the an ti- slip -regul ation (AS R) are auto ­
matically switc hed on when t he adaptive
cruise cont rol is switched on.
111

Assistance systems
Changing the speed
Applies to: vehicles w ith Audi adaptive cruise co ntro l
0
f
' 0
Fig. 113 Operat ing lever : c h ang ing the speed
.,. To increase/decrease the speed in 1 mph (1
km/h) increments, br iefly
tap the lever toward
010 c:> fig . 113 to the first level.
.,. To inc rease/decrease the speed in 5 mph
(5 km/h or 10 km/h) increments, br iefly
tap
the leve r toward 0 10 to the second level.
.,. To increase or decrease the speed quickly, hold
the lever towards 0 10 u p to the fi rst or sec­
ond level until the red
LED @ reaches the de­
s ir ed speed
c:> poge 110, fig. 112 .
You can a lso preselect the speed when adaptive
cruise control is not active by moving the lever in
the desired d irection
0 10 . Activate the previ­
ously selected speed by pulling the lever into po­
sition
(D c:>poge 110, fig. 111 .
After each change, the new stored speed appears
briefly in the status line
c:;, poge 110, fig. 112 @.
When adaptive cruise control is active, the ill in­
dicator light turns on and when adaptive cruise
control is not active, the
ll'J indicator light turns
on . In the Audi virtual cockpit*, the
II indicator
light turns on instead.
l) Thi s is not ava ilab le in som e coun tri es .
112
Dr iving in stop-and-go traffic
App lies to : vehicles wit h Audi adapt ive cruise control and au­
tomatic transmiss ion
Fig. 114 Instrument cl uster: safe start monitor
The adaptive cru ise control system also assists
you in stop-and-go traffic . If a vehicle driving
ahead stops, your vehicle will brake and stay at a
stop w ithin the limits of the system.
.,. To resume driving with adaptive cruise control,
tap the accelerator pedal or
.,. Pull the lever toward you into position@
c:>page 113, fig. 115.
Starting to drive with adaptive cruise
control
1 )
As long as the message ACC: automatic go dis­
plays and the vehicle dr iv ing ahead s tarts to
move, your vehicle will start driving
c:> ,&. Yo u can
activate
ACC: automatic go again for a short
time by pulling the lever to position@.
Fo r safety reasons, your vehicle w ill only start to
drive automatically if:
- the drive r's safety belt is fastened
-all doors and the hood are closed
- your vehicle is not stationary for more than
three minutes
Safe start monitor
If an obstacle is detected when you start driving,
you w ill be alerted to the danger by
the . indi­
cator light and the image in the instrument clus­
ter display
c:> fig. 114 c::> .&. . An audio signal will
also sound . Your vehicle will drive more slowly
when starting. This may also happen in some sit -
uations when the re is no apparent obstacle.
.,..

-Press the brake pedal to slow your vehicle
down.
A WARNING
If the message ACC: automatic go1> appears,
your vehicle will start driving even if there is an obstacle between your vehicle and the ve­
hicle driv ing ahead. This increases the risk of
an acc ident .
{!) Tips
If adaptive cruise control is active and your
vehicle does not start driving even though the
message
ACC: automatic go1 l appears, you
can start driving by tapping the accelerator
pedal.
Interrupting cruise control
A pplies to: ve hicles with Audi adaptive cruise contro l
Fig. 115 Selector lever
Requirement: adaptive cruise control must be
switched on.
Overriding cruise control
.. To accelerate manually, pull the lever toward
you into position @and hold it there or press
the accelerator pedal. The message
ACC: over­
ride
appears .
.. To resume cruise control, release the lever or
take your foot off the acce lerator pedal.
Canceling cruise control while driving
.. Move the lever into position @. The message
ACC: standby appears . Or
.. Press the brake pedal.
ll Th is is not ava ilab le in some coun tries.
Assistance systems
.. To resume the stored speed, move the lever in-
to position @.
Automatic transmission: 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 peda l
and pull the lever toward you into position @.
A WARNING
It is dangerous to activate cruise control and
resume the stored speed when the current
road, traffic or weather cond itions do not per­
mit this . This increases the risk of an accident.
Setting the distance
App lies to: vehicles wit h Audi adapt ive cr uise control
,
0
Fig. 116 Operating lever: setting the distance
.,. Tap the switch to display the current set dis­
tance
qfig . 116.
.,. To increase or reduce the d istance in incre­
ments, tap the switch upward/downward
again. The distance between the two vehicles
w ill change in the instrument cluster display.
When approaching a vehicle driving ahead, the
adaptive cruise control system brakes to match
that vehicle's speed and then adjusts to the set
distance. If the vehicle driving ahead accelerates,
then the adaptive cruise control will a lso acce ler­
ate up to the speed that you have set .
T he higher the speed, the greater the distance
¢.& .The Distance 3 setting is recommended .
113

Predictive control
(efficiency assist)
Description
A pp lies to: ve hicles with Audi adaptive cruise co ntro l an d pr e·
di ctive efficiency assist
Fig. 118 Instrument cluster: pred ictive control
General information
The predictive control 1l uses the map informa­
tion from the navigation system in order to react
proact ively when driv ing. Information from the
camera-based traffic sign recognition* is also ap­ plied to recognize traffic signs
<:!)page 104.
When coming up to areas with speed limits or
changes in the course of the road (such as curves,
intersections or traffic circles), the system brakes
automatically and then accelerates back up to
the set speed .
When adaptive cruise control is switched off, the
system only provides notifications without con­
trolled
interventions ¢ page 107.
The driver can override the predictive control at
any time by pressing the accelerator or brake
pedal. If the system changes the vehicle speed to
adapt to speed limits, you can change the speed
using the
lever ¢ page 112, fig. 113 .
Always switch off the predictive control in
the following situations:
- When increased attention is needed from the
driver .
- In poor weather conditions such as snow or
heavy rain.
0 -When driving on roads in poor condition . al ~ N
" N ~ 0 0
~ ll This is not ava ila ble in some co untrie s. al
Assistance systems
Indicator in the instrument cluster display
When switching on the adaptive cruise contro l
for the first time, the message
ACC: 11D + B ac­
tive
in the instrument cluster indicates the avail·
ability of the predictive control.
T he symbol appears when the system
is regulating the speed to match a speed limit . If
this is the case, the system is reg ulating a speed
of 50 mph (80 km/h). The speed is then taken
over by the adaptive cruise control. The speed in
the speedometer LED ring adjusts to the speed to
be maintained
¢ page 110, fig . 112. The ..
¢ fig . 118 symbo l appears when there is an adap ­
tation to the route ahead .
If you are in the Driver assistance display in the
instrument cluster, then the following symbols
will indicate which occurrence the system is cur­
rently responding to:
Symbol Meaning
MPH USA
models:
Speed limit
km/h
Canada models:
speed limiter
Ir
Curve
_l!L
1i1
Intersection
~ ): Traffic c ircle
A WARNING
- Read the warnings on ¢.&. in General infor­
mation on page 109
and on¢ .&. in Descrip­
tion on page 104 .
- Pay attention to traffic and the area around
your veh icle when predictive control is
switched on. The driver is always responsi­
ble for assessing the traffic situation.
- There is an increase in the risk of an acci­
dent, because the system does not consider
"right of way" rules and also does not re-
spond
to traffic lights. ._.
115