2018 AUDI A3 SEDAN brake

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-Due to t he interlinking o f various vehicle sys­
tems, critica l driving situations can be detected
by
pre sense ba sic and meas ures for preventa ­
t ive occ upant protection are can be initiated.
- The
pre sense front uses the data from the ra ­
dar sensors and calc ulates the probab ility of an
acc ident
c::> page 124. An impending collision
with vehicles ca n be detected within the limits
of the system . In this case, the system warns
the driver v isually, acoustically and with a je rk
on the brakes if necessary. If needed, it ca n ini ­
tiate a part ia l o r full dece le ra tion to reduce the
co llision speed o r to avo id t he coll is io n unde r
ce rtain c ircumstances. In conjunc tion wi th pre
sense basic, the front safety belts are a lso re ­
versib ly tensioned w hen needed . The pre sense
front is a lso active when adaptive cruise con­
trol* is sw itched off.
A WARNING
Also follow the genera l instructions fo und in
c::> .&. in G eneral information on page 124.
(D Tips
- Certain pre sense f unctions switch off when
d riving in reverse.
- The pre sense functions may not be avai la­
b le if there is a ma lfunction in the ESC sys­
tem or the airbag contro l modu le.
- Note t hat the revers ible belt tensioner on
t h e front passe nger's side deactivates w hen
the front passe nger's a irbag is deact ivated .
- Switch the pre sense off when you are not
us ing public streets or whe n loadi ng the ve­
h icle onto a veh icle carrier, train, ship or
othe r type of t ransportation . T his can pre­
vent a n un des ired intervent ion from the pre
sense sys te m .
Audi pre sense basic
App lies to: ve hicles with Audi pre sense basic
The pre sense basic funct io ns are activ ated a t a
speed of approximate ly 20 mph (30 km/h) or
h igher .
The fo llow ing funct io ns can be t rigge red unde r
cert ain cond itions withi n the limi ts of the sys ­
tem :
Ass istance systems
- Tensioning o f the safety belts (for examp le,
during heavy braking) : the front safety belts
have revers ib le be lt tens ione rs . If a collision
does not occu r, the safety belts loosen slig htly
and are ready to tr igger aga in.
- Initiat ing the clos ing of the w indows and the
panorama g lass roof* (for examp le when un­
der- or oversteering).
Audi drive select*: the trigger times are adjusted depending on the mode selected .
Audi pre sense front
Applies to : vehicles wi th Audi pre sense fro nt
Fig. 134 In str u men t cluster : approac h warni ng
Description
Wi thin the lim its of t he sys tem and depending
on the sit uat ion and spee d, p re sense front can
warn you about impending collisions with sta ­
t iona ry, stopped, and moving vehicles and ini ­
tiate app ropr iate braking measu res.
0 .... a, "? :i:: ~ a:
If detection is not possib le, then pre sense front
does not react.
T he following fu nctions t rigge r in conjunction
wi th pre sense basic at co rresponding ve hicle
speeds :
- Reve rsible tens ion ing of the front safety belts.
- Clos ing the windows and pano rama g lass roof* .
Early warning /acute warning
The system can provide visual and audible warn­
ings when dangerous situations are detected.
The
early warning may occur if:
- a vehicle driving ahead brakes st rong ly,
131

Ass is tanc e system s
-your vehicle is traveling at speeds between ap ­
proximately 20 to 50 mph (30 to 85 km/h) and
it approaches a stationary vehicle.
- your vehicle is traveling at speeds between ap ­
proximately 20 to 155 mph (30 to 250 km/h)
and it approaches a vehicle that is clearly trav ­
eling more slowly or a veh icle in your direction
o f travel tha t is stopped.
When this warning occurs, it may only be possi ­
b le to avoid a collision by swerving or braking
strong ly. The message
A udi pre sense.
¢ fig. 134 and a warning tone will warn you
about the danger .
If there is an impending collision with vehicles,
there will a lso be an
acute warning in the form of
sharp braking. If you do not react to the acute
warn ing, pre sense front can brake with increas ­
ing force within the limits of the system . T his re­
duces the vehicle speed in the event of a coll i­
sion .
Autom atic deceleration
Depending on the speed, pre sense front can de­
cel erate automatica lly
shortly before a collision:
-if there are stationary vehicles when you are
traveling at speeds up to approx imately 28
mph (45 km/h)
-if there are veh icles dr iv ing or stopped ahead
whe n you are traveling at speeds up to approxi­
mately 155 mph (250 km/h)
Autom atic bra king force inc rea se
If pre sense front determines that you are not
braking strongly enough when a co llision is imm i­
nent, it can inc rease the braking force, depending
on the situation and speed:
-if there are stationary vehicles when you are
traveling at speeds up to approx imately 50
mph (85 km/h)
-if the re are ve hicles driving or stopped ahead
when you are traveling at speeds up to approxi­
mately 155 mph (250 km/h)
A WARNING
Pre sense front cannot ove rcome the laws of
physics . It i s a system des igned to assist and
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it cannot prevent a coll is io n in eve ry ci rc u m ­
stance . The driver m ust always intervene. The
driver is always respons ible for braking at the
correct time . Do not let the inc reased safety
provided tempt yo u into tak ing risks . This
could inc rease your r isk of a co llision.
-Keep in mind that pre sense front can pro­
vide war nings or b rake unexpectedly. Al­
ways secure a ny cargo or objects that yo u
a re transporting to reduce t he ris k of dam­
a ge or inj ury.
-The system can dep loy in co rre ctly due to
sys tem -specific li mits.
-Please note that the se nsor does not a lways
detect a ll obje cts. Thi s increases the r is k of
a c ollision .
-Pre sense front does not rea ct to ve hicles
tr ave ling towa rd yo u in the same lane, to
peop le, groups of people, anim als, ob je cts
that are crossing the road, or objects t hat
are difficult to
detect ¢.& in General infor­
mation on page 124 .
A WARNING
Pre sense front may be restricted o r not avai l­
ab le in the fo llow ing example s ituations :
-if there a re othe r reflective objects nearby,
such as gua rd ra ils or vehicles
-when driving into a tunnel
-in heavy fog, ra in, sp ray o r snow
-if the rada r senso r is d irty, covered in ice,
d amaged, or cove red
- in curves
- if the ESC was restr icted or sw itched off
@ Note
The sensor can be d isplaced by impacts or
damage to the bumper, wheel housing and underbody. Pre sense front can be impaired
by this . Have an author ized A udi dealer or au­
thor ized Audi Se rvice Facility check t heir func-
-
tion. 1111-

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(D Tips
-Side assist is not active w hile you are mak­
i ng the ad justment.
- Your settings are automatically stored and
ass igned to the remote control key being
used.
Rear cross-traffic assist
App lies to: vehicles with rear cross-traff ic assist
Fig. 14 2 Example display
Fig. 143 Infotainment system: rear cross -traffic ass ist dis ­
play
Activating rear cros s-traffic assist
The rear cross- traffic assist is ac tivated a utomat i­
cally if you t urn on the pa rking aid
¢ page 143 or
shift into reverse gear.
The rea r cross- traffic assist can warn t he drive r of
a potential collis ion with approaching cross-traf­
f ic when driving in reverse at speeds up to ap­
proximately 7 mph ( 12 km/h). Within its limits,
the system monitors the areas behind and next
to the veh icle using the radar sensors when leav­
ing a parking space
c:> page 137, fig . 141. Moving
objects that are approaching, such as cars, are
detected
c:> fig . 142.
If the system detects cr itical cross traffic when
backing out of a parking space, it will react as fol­
lows:
A ssi st a nce systems
- Visual indicator : an indicator appears in the In ­
fotainment system disp lay with a red arrow
symbo l. The arrow points in the d irect ion from
which the object is
approaching ¢ fig. 143.
-Audible warning signal : a continuous tone may
sound as an addit ional indicator when dr iving in
reverse.
- Automat ic brake acti vation : a brief activation
of the brakes may also warn you of a potent ial
collision w ith an approaching object.
The audib le warning signal and the automatic
bra ke activation occur only when driv ing in re ­
verse.
A WARNING
-- The rear cross-traffic assist is an assist sys­
tem and cannot prevent a co llision by itself .
The drive r must always intervene . T he d river
is always respons ible for b raking at the cor­
rect t ime.
- Please note that the rear cross-traff ic assist
may activate the b rakes unexpe cted ly. Se­
cure a ny cargo th at you are transpor ting to
redu ce t he risk of damage or i njury.
- An add itiona l brake activation may be t rig­
ge red w ith in 10 seconds after an automatic
b rake activation.
- I f the re is an acoustic wa rn ing s ignal from
the rea r cross-traffic ass ist, t hen the p ark­
ing sys tem may not warn you of detected
obstacles under certain circumstances.
- The v iew o f the radar sensors may be im­
pa ired by leaves, s now, heavy sp ray or dirt.
Clean the area i n front of the sensors
c:>page 137, fig. 141 .
A WARNING
-
-The rear cross -traffic assist will not provide
alerts if your vehicle is pulled too far into
the parking space so that it is hidden by ad­
jacent vehicles.
- The rear cross-traffic assist will not provide
alerts about people a nd can not warn you
about every type of approaching objects,
such as cyclists. Always monitor the t raff ic
as we ll as the vehicle's sur roundi ngs wit h di-
re ct eye contact .
~
139

Assistance systems
-The rear cross-traffic assist will not provide
alerts if the veh icle is in a paralle l parking
space or an angled parking space.
(LlJ Note
Also read the information in <=:>@ in General
information on page 138 .
(D Tips
-You can cancel the automa tic brake activa ­
tion with increasing braking force if you ap­
ply the brakes yourse lf or accelerate consid ­
erab ly.
- In some situations, rear cross-traffic assist
may warn you even if there is no cross traffic
i n a critical area, for example when backing
i nto a parking space or maneuver ing.
- The rear cross-traffic assist also switches off when you switch off the ESC.
- The system is not available when towing a
trailer.
Messages
A pp lies to: ve hicles w ith Audi side assis t
If the side assist sw itches off automatically, a
message appears in the instrument cluster dis­
play.
@j Aud i side assist: malfunction! Please contact
Service
The system cannot guarantee that it wi ll detect
veh icles correctly and it has switched off. The
sensors have been moved or are faulty. Have the
system checked by an authorized Audi dealer or
author ized Audi Service Facility soon .
(ij Audi side assist: currently unavailable. No
sensor view
(ij Audi side assist: currently unavailable. Sen­
sor vision restricted due to surroundings. See
owner 's manual
The radar sensor vis ion is impaired . Do not cover
the area in front of the sensors with bike wheels,
stickers, dirt or other objects. C lean the area in
front of the sensors, if necessary
c> page 13 7,
fig . 141.
140
(ij Audi side assist: currently unavailable
Sid e assist cannot be switched on at this time be­
cause there is a malfunction (for ex am ple, the
battery charge level may be too low).
@j Audi side assist: unavailable in towing mode
(ij Audi side assist: unavailable in towing mode
Side assist switches off automatically after a
short time when a factory-insta lled trai ler hitch
i s connected to the electr ica l connector on the
trailer. There is no guarantee the system will
switch off when using a retrofitted trailer hitch .
Do not use side assist when tow ing a tra iler .
[I! Rear parking aid : obstacle detection restrict­
ed
The rear cross-traffic assist is not available . Ei ­
ther t he ESC is switched off, or the radar sensors
may be covered by a bike rack, stickers, leaves,
snow or other objects. Switc h the ESC on, or
clean the area in front of the sensors if necessary
<=:>page 137 , fig . 141. If th is message continues
to be displayed, dr ive immed iate ly to an author­
iz ed Audi dealer or authorized Audi Se rvice Facili­
ty to have the malfunction repaired.
Audi drive select
Introduction
App lies to : vehicles wi th Audi drive se lec t
Audi drive select makes it poss ible to experience
different types of vehicle settings in one vehicle.
The dr iver can select from three modes,
Comfort ,
Auto
and Dynamic , using the ~.'/:.1 button in the
center console or by using the Infotainment sys­
tem. This allo ws you to switch between a sporty
and a comfo rtable driving mode, for example. In
the
Individual* mode, the settings can be adjust ­
ed to your personal preferences . This makes it
possible to comb ine settings such as a sporty en­
gine setting with light steering.
Description
Applies to: vehicles wit h Audi drive se lect
The vehicle setup in each mode depends on the
vehicle 's features. However, the engine and
steering are a lways affected .

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in reverse q .&. in General information on
page 143,
~ 0 in General information on
page
143!
(D Tips
If you press the P, Y! button to switch the park­
ing aid off, it can only be reactivated auto­
mat ically when one of the following condi­
tions is met:
- The vehicle speed exceeds 6 mph (10 km/
h).
-The ignition is switched off and back on
again.
- The parking brake is set and then re leased .
- The "P" selector lever position is engaged
and released aga in.
Rearview camera
Introduction
App lies to: veh icles with rearview camera
Fig . 14 8 Illustrat ion: c ro ss park ing
T he rearview camera helps you to park or maneu­
ver us ing the or ientation lines .
Park ing aid
General information
Applies to: vehicles with rearview camera
-----.---
Fig. 149 Area co vere d (D and area not cove red @ by th e
r earv iew ca mera (examp le)
0
F ig . 1 50 Lu ggage compartmen t lid : locat io n of t he rear ­
v iew came ra (example)
The rearview camera is located above the rear li·
cense plate bracket . Make sure that the lens for
the parking system
¢ fig . 150 is not covered by
deposits or any other obst ruct ions because this
can affect the function of the parking system. For
information on cleaning, see
¢ page 354.
T he rearview camera coverage area includes (D
¢ fig . 149 . Onl y this a rea is s hown in the Info­
ta inment display . Objects that are in
area @,
wh ich is not covered, are not displayed .
WARNING
-Always read and follow the applicab le warn­
ings ¢.&. in General information on
page 143 .
-If the position and the installa tion angle of
the rearview camera was changed , for ex­
ample after a collision, do not continue to
use the system for safety reasons. Have it
checked by an authorized Aud i dealer or a u-
thor ized Audi Service Facility.
~
145

Intelligent Technology
Intelligent Technology Electronic Stabilization
Control (ESC)
Description
Elect ronic stabili zation control ( ESC) supports
driver safety. It red uces the risk of slipping and
improves dr iving stabi lity. ESC detects crit ica l sit­
uations such as the vehicle overstee ring and un­
dersteeri ng or the w heels are sp inning. The vehi­
cle is stabilized by app lying the brakes or reduc ­
i n g e ngine torque . When the ESC engages, the
G1 indicato r light bli nks in t he instr ument clus­
t er.
The fo llow ing systems are in tegrated in the ESC:
Anti-lock braking system (ABS)
ABS p reve nts the whee ls from lock ing whe n brak ­
ing. The vehicle can st ill be steered even d uring
hard brak ing. Apply steady press ure to the bra ke
pedal. Do not pump the pedal. A puls ing in t he
b rake pedal indicates that the system is act ing to
s tabili ze the vehicle .
Brake assist system
The brake assist system can decrease brak ing dis­
tance . It inc reases brak ing power when the d river
presses the brake pedal q uick ly in eme rgency sit­
uations . You must press and hold t he b rake pedal
until the dangerous si tuatio n is ove r. In veh icles
w ith adapt ive c ruise con trol*, the bra ke assist
sys te m is more sensitive if t he di stan ce detec ted
t o the veh icle dr iv ing ahead is too small.
Anti-Slip Regulation (ASR)
ASR reduces eng ine power when the drive wheels
beg in s pinning a nd adapts the force to the road
conditions . T his makes it easie r to sta rt, acceler­
a te and dr ive u p hill s.
Electronic differential lock (EDL)
The EDL applies the brakes to a whee l t h at starts
sp inning and transfe rs t he d rive power to t he
other d riving wheel or wh eels ( if the veh icle is
eq uipped w ith all whee l dr ive*) . T his func tion is
no t a vailable at hig her s pee ds .
148
In extreme cases, ED L automat ica lly swi tches off
to keep the b rake o n the bra ked whee l from over ­
h eating. The ve hicle is still wo rking co rrect ly. ED L
will switc h on again automatically when condi­
tions have returned to normal.
Power steering
The ESC can also support veh icle sta bility
th ro ugh stee ring .
Selective wheel torque control
Selective w heel to rque cont rol is used when driv­
in g on curves. The fron t whee l on the in side of
t h e curve or both whee ls on t he i nsid e of the
cu rve are braked se lective ly as needed. This al ­
l ows mo re precise driving in cu rves .
Automatic post-collision braking system
The "automat ic pos t-coll is io n braking syste m"
c a n help t o reduce t he risk of sliding and of addi ­
tion al collisions a fter an acc iden t. If the a irbag
contro l modu le detects a collision above a certa in
vehicle speed, the ve hicle is braked by the ESC.
The
ve hicle does not br ak e automatically if;
- t he dr ive r presses the acce lerato r pedal, or
- the ESC, the b ra ke system or the ve hicle elect ri-
cal sys tem are not func tioning .
A WARNING
-The ES C and i ts in tegra ted systems can not
over co m e the li mits im posed by n atural
p hy sical laws. T h is is es peci ally i mpo rtan t
on s lippery or we t ro ad s. If the sy stem s be­
gi n acting to stabilize yo ur vehicle, you
should immediately a lter your speed to
match the road and t raffic conditions. Do
not let the increased safety provi ded tempt
you into tak ing risks. This could increase
your r is k of a coll is io n.
- Please note the r is k of a coll is io n increases
when dr iv in g fast , especially t hrough c urves
and on s lippery or wet roads, and when dr iv­
ing too close to obj ects ahead . T he ESC and
i t s in teg rated sys tems c annot alw ays pre­
ve nt col lisio ns
-th ere i s still a r is k of acci-
d en ts!
..,.

Intelligent Technology
-There is no vehicle stabilization when ESC/
ASR are switched off.
(D Tips
- ESC/ ASR cannot be switched off or sport
mode cannot be switched on if the cruise
control system * or the adaptive cruise con­
tro l* is switched on.
- Malfunctions in the Audi magnetic ride*
may make it impossible to switch the ESC/
ASR off or to switch sport mode on.
Brakes
New brake pads
New brake pads do not achieve their full braking
effect during the first 250 mi (400 km). They
must be "broken in" first. However, you can com­
pensate for the slightly reduced braking force by
pressing firmly on the brake pedal. Avoid heavy
braking dur ing the break-in per iod .
The break-in period can be considerably longer
for vehicles with ceramic brake rotors*. However,
you can compensate for the slightly reduced
braking force by pressing f irmly on the brake
pedal. Avoid heavy brak ing dur ing the break- in
pe riod .
Wear
Brake pad
wear depends largely on the way the
veh icle is driven and on operat ing cond itions .
This is especially true if you are driving frequently
in the city and on curves or with a sporty driving
style.
Operating noise
Noises may occur when braking depend ing on the
speed, braking force and outs ide cond itions such
as temperature and humidity.
Noises may become more apparent at lower
speeds due to the nature of the materials in the
ceramic brake rotors*.
Effect of water and road salt
In certain situations, for example after driving
through water, in heavy rain, after overnight con­
densat ion or after washing your car, the braking
150
effect can be reduced by moisture or ice on the
brake rotors and brake pads . The brakes must be
"dried" first with a few carefu l brake applica ­
tions.
At higher speeds and with the windshield wipe rs
turned on, the brake pads press against the brake
rotors for a short amount of time . This action,
which is not felt by the dr iver, happens at regular
i ntervals and ensures a better reaction t ime for
the brakes in wet weather .
The brak ing effect can also be reduced if you are
driv ing on salted roads and you do not app ly the
brakes for long periods of time. The layer of salt
on the brake rotors and pads must be worn off
first whe n the brakes are applied .
Due to its surface, the ceram ic brake rotor* ab­
sorbs moisture in certain s ituations . Therefore,
there will temporarily be less braking force than
when the brakes are dry . You can compensate for
th is by press ing the brake pedal harder.
Corrosion
Leaving the vehicle parked for long periods of
time, low mileage and avoiding heavy braking
can contribute to corros ion on the brake rotors
and to dirty brake pads.
If you usually avoid heavy braking or if there is
corrosion present, occasional heavy brak ing at
high speeds is recommended to clean the brake
rotors and
pads~.& .
Brake system malfunction
If you notice that the brake pedal travel has sud­
denly
i ncreased, then a brake circuit in the dua l­
c ir cuit brake system may have malfunctioned.
Drive to an authorized Audi dealer or authorized
Audi Service Fac il ity immed iately to have the
problem corrected. On the way there, drive with
r educed speed and keep in mind that you will
need a longer distance to stop and you will need
to press the brake pedal harder.
Low brake fluid level
When the brake fluid level is low, malfunctions in
t h e b rake system may occur. The b rake flu id level
is electronically monitored.
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Brake booster
The brake booster amplifies the pressu re yo u ap­
p ly to the brake pedal. It only operates while the
engine is running or when the ignition is switched
on (plug-in hybrid drive*) .
A WARNING
- Only apply the brakes for the purpose of
cleaning the brake system when road and
traff ic conditions permit. You must not en­
danger other road users. This increases the
r isk of an accident .
-
-Never let the vehicle roll while the engine is
stopped because this increases the risk of an
acc ident.
- Depend ing on the veh icle equipment, the
brake pedal may be pulled downward when
the vehicle automatically initiates b rak ing.
- Never place objects in the driver's footwell.
An object could end up in the area around
the pedals and prevent you from using
them. You wo uld not be able to use the ped­
als if sudden driving or braking mane uvers
were needed, which increases the risk of an
accident.
- Only use floor mats that do not obstruct the
area around the pedals and that can be se­
curely fastened in the footwe lls.
- T o reduce the risk of injury, do not place
your foot under the brake pedal.
(Llj) Note
-Never let the brakes "rub" by pressing the
pedal lightly when braking is not actually
necessary. This causes the brakes to over­
heat and increases braking distance and
causes wear.
- Before driving on a long stretch with steep
slopes, reduce your speed and shift to the
next lower gear This makes use of the en­
gine braking effect and relieves the brakes.
If you need to brake add it ionally, brake in
i ntervals and not cont inuously.
Intelligent Technology
(D Tips
- If the brake booster is not working, you
must press the brake pedal with much more
force than normal.
- If you retrofit your vehicle with a front spoi l­
er, wheel covers or simi lar items, make sure
that the air flow to the front wheels is not
interrupted. Otherwise the brake system
can become too hot.
Electromechanical
steering
The electromechanical steering supports the
driver's steering movements.
Power steering adapts electronically based on
the ve hicle speed.
Indicator lights and messages
• Do not drive vehicle: steering defective
If this indicator light turns on and stays on and
th is message appears, the power steering may
have failed .
Stop the vehicle in a safe location as soon as pos­
s ible. Do
not cont inue driving. See an authorized
Audi dealer or authorized Audi Service Fac ility for
ass istance .
l;r-ij Steering: system fault! You can continue
driving
If the indicator light turns on, the steering wheel
may be more difficult to move or more sensitive
than usual. The steering whee l may also be at an
angle when driving straight.
Drive slowly to an authorized Audi dea ler or au­
thorized Audi Service Facility to have the mal­
function corrected.
(D Tips
If the. or 'Tij indicator light on ly stays on
for a short time, you may continue driving .
151