2018 AUDI A4 brakes

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Trailer towing Driving with a trailer
General information
Your Audi was designed primarily for passenger
transportation .
If you plan to tow a trailer, please remember that
the additional load will affect durability, econo­ my and performance.
Trailer towing not only places more stress on the
vehicle, it also calls for more concentration from
the driver.
For this reason, always follow the operating and
driving instructions provided and use common
sense.
Technical requirements
Trailer hitch
Use a weight-carrying hitch conforming to the
gross trailer weight. The hitch must be suitable
for your vehicle and trailer and must be mounted
securely on the vehicle's chassis at a technically
sound
location . Use only a trailer hitch with a re­
movable ball mount . Always check with the trail­
er hitch manufacturer to make sure that you are
using the correct hitch.
Do not use a bumper hitch.
The hitch must be installed in such a way that it
does not interfere with the impact -absorbing
bumper system. No modifications should be
made to the vehicle exhaust and brake systems .
From time to time, check that all hitch mounting
bo lts remain securely fastened.
When you are not towing a trailer,
remove the
tra iler hitch ball mount . This prevents the hitch
from causing damage shou ld your vehicle be
struck from beh ind ¢
,&. .
Trailer brakes
If your trailer is equipped with a braking system,
check to be sure that it conforms to all regula­
tions .
Trailer towing
The trailer hydraulic brake system must not be
directly connected to the vehicle's hydraulic
brake
system ¢.&. .
Safety chains
Always use safety chains between your vehicle
and the trailer.
Trailer lights
T ra iler lights must meet all regulations . Be sure
to check w ith your author ized Audi dealer for cor­
rect wiring, switches and relays.
Mirrors
If you are unable to see the traffic behind you us­
ing the regular outside mirrors, then you
must in­
stall extended mirrors. It is important that you
always have clear vision to the rear.
,8. WARNING
After removing the traile r hitch, do not store
it in your vehicle. In case of sudden braking,
the hitch could fly forward and injure you or
your passengers.
Operating instructions
Maximum trailer weight
A trailer for your vehicle is limited to a typical
class 1 or class 2 trailer.
Trailer load distribution
Be sure the load in the trailer is held securely in
place to prevent it from shifting forward, back­
ward or sideways.
Never allow a passenger to ride in a trailer ¢.&.
in Driver messages on page 100 .
Engine cooling system
Towing a trailer makes the engine work harder. It
is important that the cooling system's perform ­
ance is up to the additional load. Make sure that
the cooling system has enough fluid.
Tire pressure
When towing a trailer, inflate the tires of your
vehicle to the tire pressure listed under "Full
load" on the label ¢ page 344. Inflate trailer
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operation. You are always responsible for
your speed and the distance between your
vehicle and other vehicles.
- For safety reasons, cruise control should not be used in the city, in stop-and-go traffic, on
winding roads and when road conditions are poor (such as ice, fog, gravel, heavy rain and
hydroplaning), because th is increases the
risk of an accident.
- Switch the cruise control off temporar ily
when driving in turn ing lanes, h ighway exits
o r in construction zones.
- Please note that unconsciously "resting"
your foot on the accelerator pedal prevents the cruise control from b raking. This is be­
ca use p ressing the acce le ra to r peda l ove r­
rides the cruise contro l system.
- If a brake system ma lf u nction such as over­
heating occurs when the c ruise contro l sys­
tem is switched on, the braking function in
the system may be switched off . The rest of
the cruise control system functions remain
act ive as long as the
@;\l)M~ (USA models) /
Bl (Canada models) indicator light is on.
Before driving downhill a long distance on a
steep hill, decrease your speed and select a
lower gear. Th is makes use of the eng ine
braking effect and relieves the brakes.
(D} Tips
-Applies to: vehicles with manual transmis­ sion: The set speed can on ly be reached if
the engaged gear permits it so that the en­
gine is not over-rewed and will run smooth­ ly. Therefore, s hift into the higher or lower
gear in a timely manner .
- The brake lights turn on when the brakes are applied automatically.
Changing the speed
Applies to: vehicles with cruise control system
.. To inc rease/decrease the speed in 1 mph ( 1
km/h) increments, br iefly
tap the lever toward
0 10 ¢ page 102, fig. 103 to the first level.
A ss ista nce sys te m s
.. To increase/decrease the speed in 5 mph (10
km/h) increments, briefly
tap the lever toward
0 10 to the second level.
.. To increase or decrease the speed quick ly, hold
the lever toward 0 10 to the first or second
level unt il the desired speed is reached .
Overriding the speed
Applies to : vehicles with cruise control system
You can press the acce lerator pedal to increase
you r speed, fo r example if you want to pass
someone. The speed you set earl ier will resume
as soon as you release the acce lera to r pedal.
However, if you are exceeding the stored speed
by a considerable amount fo r a long time, the
c ruise contro l system will temporarily switch off.
T he
(ij;jl)~i~ (U SA mode ls) !Iii (Canada mode ls) in­
dicator light in the inst rument cluste r turns off
and the stored speed is maintained.
Preselecting a speed
Applies to: vehicles with cruise control system
You can pre-select your desired speed when the
vehicle is stationary .
.. Switch the igni tion on.
.. Pull the lever i nto pos it ion (!) ¢page 102,
fig. 103 .
.. To increase or decrease the speed, tap the lever
toward
0 10 .
This function makes it possible, fo r example, to
save the speed you want before driving on the
highway. Once you are on the expressway, acti­
vate the cruise contro l system by pull ing the lev­
er into
position (!).
Switching off
Applies to : vehicles with cruise control system
Deact iva ting tempor aril y
.. Press the brake pedal, or
.. Press the lever toward @(not locked i nto
place)
¢ page 102, fig. 103 .
103

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
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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 .

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).
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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.
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-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
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~ 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. ._.
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In a speed range under 40 mph (65 km/h), traffic
jam assist can help to keep the vehicle within a lane calculated by the system. W ith in the lim its
of the system, the system controls the steering
automatically when adapt ive cruise control is
switched on . Since traffic jam assist is only an as­
sist system, the driver must always keep his or
her hands on the steer ing whee l and be ready to
steer. The d rive r ca n override the control at any
time by actively steering.
The system is designed for driv ing on express­
ways and highways.
Switching traffic jam ass ist on and off
... Press the button to switch the system on and
off<=> fig. 119.
... To turn the system off completely, select in the
Infotainment system:
I MENU ! button> Vehicle
> left contro l button > Driver a ssistance > Traf­
fic jam a ssist .
If traff ic jam assist was deactivated through the
Infotainment system, you can cont inue operating
the act ive lane assist using
the<=> fig. 119 button
<=> page 126. The traffic jam ass ist functions are
no longer available.
Requirements for using traffic jam assist:
-Traffic jam assist must be switched on in the
Infota inment system .
-Adaptive cruise control must be switched on
and act ive
c;, page 110 .
Always switch off traffic jam assist in the
following situations:
-When increased attention is needed from the
driver .
-In poor weather conditions such as snow or
heavy rain .
-When driving on roads in poor condition .
-In construction zones.
-In city driving .
Traffic jam assist availability:
When you are in the Driver assistance view in the
in str ument cluster disp lay, the indicator light
turns
on ¥ and the message Traffic jam assist
available
appears if a traffic jam situation was
detected. You can open the
Driver assistance dis -
Assistance systems
play using the mu ltifunction steering wheel but­
tons
c;, page 13 . To activate traffic jam assist, you
must press the
<=> fig. 119 button and switch on
the adaptive cruise control
c;, page 110.
Indicator lights
Ill and II-traff ic jam assist is switched on.
Vehicles driving ahead were detected. Your vehi ­
cle adapts whi le driving
c;, fig. 120.
•-Traffic jam ass ist switches off if the driver
does not take over steer ing after multiple driver
intervention requests . The system brakes the ve ­
hicle until it is stationary.
A WARNING
-A lways keep your hands on the steering wheel
so you can be ready to steer at any t ime . The
driver is always responsible for staying in a lane and for assessing traffic s ituations . Read
and follow the warnings
on<=>.& in General
information on page
109 . Never use traffic
jam ass ist in the following situations or you
will increase the risk of an accid ent.
-Driving offroad or on unpaved roads. Traffic
jam assist is only designed for use on paved
roads.
-I n city driv ing o r in construction zones.
-On curv ing stretches of road.
-In narrow lanes.
- In unclear traffic situat ions such as at inter-
sections or toll stat ions.
@ Tips
You are not necessarily guided to the center
of your lane.
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