2013 AUDI S4 brakes

-Do not ride the brakes or press the brake
pedal too often or too long when driving
down a hill. Constant braking causes the
brakes to overheat and substantially re­
duces braking performance, increases
braking distance or causes complete fail­
ure of the brake system.
- To prevent the vehicle from rolling back
when stopping on inclines, always hold it
in place with the brake pedal or parking
brake.
- Never hold the vehicle on an incline with
a slipping clutch. The clutch opens auto­
matically when it becomes too hot from
the overload. An indicator lamp
[O] illu­
minates and a driver message appears
¢ page 9 7 when the clutch is overload­
ed .
- If the engine must remain running, never
have any driving position engaged when
checking under the hood. Make sure the
selector lever has securely engaged and
is locked in P with the parking brake set
¢ page 213, Engine compartment . Oth­
erwise, any increase in engine speed may
set the vehicle in motion, even with the
parking brake applied .
0 Note
-S tronic ®- and tiptronic transmission:
When stopping on an incline, do not try
to hold the vehicle in place by pressing
the accelerator pedal while a driving gear
is selected. This can cause the transmis­
sion to overheat and can damage it. Acti­
vate the parking brake or press the brake
pedal to prevent the vehicle from rolling.
- S tronic ®- and tiptronic transmission: Al­
lowing the vehicle to roll when the en­
gine is stopped and the selector lever is in N will damage the transmission be­
cause it is not lubricated under those cir­
cumstances .
(D Tips
For safety reasons, the parking brake is re­
leased automatically only when the driv ­
er's safety belt is engaged in the buckle.
Transmission 95
Hill descent control
App lies to veh icles: w it h m ult itro nic/S tro nic/t iptro nic
The hill descent control system assists the
driver when driving down declines .
Hill descent control is activated when these­
lector lever is in D/S and you press the brake
pedal. The transmission automatically selects
a gear that is suitable for the incline. Hill de­ scent control tries to maintain the speed ach­
ieved at the time of braking, within physical
and technical limitations. It may still be nec­
essary to adjust the speed with the brakes.
Hill descent control switches off once the de­
cline levels out or you press the accelerator
pedal.
On vehicles with the cruise control system*
¢ page 89 , hill descent control is also activat­
ed when the speed is set.
.&_ WARNING
-
Hill descent control cannot overcome
physical limitations, so it may not be able
to maintain a constant speed under all
conditions. Always be ready to apply the brakes.

100 Audi adaptive cruise control and braking guard
confirmed by the video camera, an acute
collision warning.
- For safety reasons, do not use adaptive
cruise control when driving on roads with
many curves, when the road surface is in
poor condition and/or in bad weather
(such as ice, fog, gravel, heavy rain and
hydroplan ing). Using the system under
these conditions could result in a colli­
sion.
- Switch adaptive cruise control off tempo­
rar ily when driv ing in turning lanes, on
expressway exits or in construc tion
zones. This prevents the vehicle from ac­
celerating to the set speed when in these
situations.
- Th e adaptive cruise control system w ill
not brake by itse lf if you put your foot on
the accelerator pedal. Doing so can over­
ride the speed and distance regulation.
- When approaching stationary objects
such as stopped traffic, adaptive cruise
control will not respond and braking
guard w ill have limited function.
- The adaptive cr uise control system and
braking guard do not react to people, an­
ima ls, objects crossing the road or on­
coming objects .
- The function of the radar sensor can be
affected by reflective objects such as
guard rails, the entrance to a tunnel,
heavy rain or ice.
- Never follow a vehicle so closely that you cannot stop your vehicle safely. The
adaptive cruise control cannot slow or
brake the vehicle safely when you follow
ano ther vehicle too closely . Always re­
member that the automatic braking
function cannot bring the vehicle to a sudden or emergency stop under these
conditions.
- To prevent unintended operation, always
switch ACC off when it is not being used.
{[) Note
The sensor can be d isp laced by impacts or
damage to the bumper, whee l housing and
underbody . That could affect the adaptive cruise control system and b
raking guard.
Have your authorized Audi dea ler or au­
thorized Audi Service Facility check their
function.
, In curves
Applies to vehicles: wit h Aud i adapt ive cr uise contro l
Fig . 111 Examp le: driv ing into a curve
When driving into a curve <=> fig. 111 and out
of a curve, the adaptive cruise control may re­ act to a vehicle in the next lane and app ly the
brakes. You can override or prevent the brak­
ing by pressing the accelerator pedal briefly.
Stationary objects
Applies to vehicles: with Aud i adaptive crui se contro l
Fig. 112 Examp le: object chang ing lanes a nd station ­
a ry object
The adaptive cru ise control system only reacts
to objects that are moving or that the system
has a lready detected as moving. For example,
if a vehi cle@ , which has already been detect­
ed by the adaptive cruise control, turns or
changes lanes and another stationary vehicle
@ is located in front of that vehicle, the sys­
tem will not react to the stationary vehicle.

102 Audi adaptive cruise control and braking guard
Switching on and off
Applies to vehicles: with Audi adaptive cruise control
Fig. 114 Se lec tor lever: switching on/off
Fig. 115 Instrument clus te r: A udi adap tive c ru ise co n·
trol
You can set any speed between 20 mph and
95 mph (30 and 150 km/h).
Indicator lamps and messages in the instru·
ment cluster display inform you about the cur·
rent system status and settings.
Switching Audi adaptive cruise control on
• Pull the lever toward you into position@
r=;,fig. 114. ACC standby appears in the in ·
strument cluster display.
Setting the speed and activating
regulation
.. To set the current speed, press the !SE T!
button r=;, page 11, fig . 4. The set speed is shown in
the tachometer @and is also
shown briefly in the display@~
fig. 115.
Switching Audi adaptive cruise control off
• Push the lever away from you into position
@ until it clicks into place. The message
ACC off appears.
@ Indicator lights
11 · Adaptive cruise control is switched on. No
vehicles are detected up ahead. The stored
speed is maintained.
I-A moving vehicle is detected up ahead.
T he adaptive cru ise control system regulates
the speed and distance to the moving vehicle
ahead and accelerates/brakes automatically.
I-When automatic braking is not able to
keep e nough distance to a previously detected
moving veh icle up ahead, you must take con·
trol and brake ~
page 105, Request for driver
intervention.
© Display
If adapt ive cru ise control is not shown in the
display, you can call it up w ith the
I RESET I
button r=;, page 24.
Based on the symbols in the display, you can
determine if the system is maintain ing a d is ·
tance to the vehicle ahead and what that dis­
tance is.
No vehicle· No vehicle ahead was detected .
White vehicle· A vehicle ahead was detected .
Red vehicle -Prompt for the driver to take ac­
tion
,=;, page 105.
Both arrows 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 .
T he green zone on the scale shows the stored
distance. For information on changing the
stored distance, refer tor=;,
page 104 . If the
distance se lected is too close or may soon be·
come too close , the arrows move into the red
zone on the sca le. .,..

104 Audi adapti ve cruise control and br aking guard
Setting the distance
App lies to vehicles: with Audi adaptive cruise control
Fig. 118 Selector lever: setting the distance
~ Tap the switch to display the current set dis­
tance ¢fig.
118.
~ To increase or reduce the distance by incre­
ments, tap the switch again to the left or
right. The distance between the two veh icles
will change in the instrument cluster d is­
play.
When approaching a moving vehicle up ahead,
the adaptive cru ise cont rol system brakes to
matc h that object's speed and then maintains
the stored d istance. If the vehicle ahead ac ­
celerates, adaptive cruise control will also ac ­
celerate up to the stored speed.
The highe r the speed, the greater the distance
in yards (meters)¢ ,&.. T he
Di st a nc e 3 setting
is recommended .
The distances p rov ided are specified values.
Depending on the driving situation and the
how the vehicle ahead is dr iving, the actual
distance may be more or less than these tar­
get distances .
The various symbols fo r the time increments
appear briefly in the information line @
c;, page 102, fig. 115 when you change the
settings.
c::::::,_c::::::, ___ Dist ance 1: This setting corre-
sponds to a distance of 92 feet/28 meters
when traveling at 62 mph (100 km/h), or a
time interva l of 1 second.
c::::::, __ c::::::, __ Dista nce 2 : This setting corre­
sponds to a distance of 118 feet/36 meters
when traveling at 62 mph (100 km/h), or a
time interva l of 1.3 seconds .
c::::::, ___ c::::::, _ Dista nce 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.
c::::::, ____ c::::::, Dista nce 4 : This setting corre-
sponds to a distance of 210 feet/64 meters
when traveling at 62 mph (100 km/h), or a
t ime interval of 2.3 seconds.
A WARNING
Following other vehicles too closely in­
creases the risk of collis ions and ser ious
personal injury .
- Sett ing short distances to the traffic
ahead reduces the time and distance
availab le to bring your vehicle to a safe
stop and makes it even more necessary
to pay close attention to traffic.
-
- Always obey applicable t raffic laws, use
good judgment, and select a safe follow­
ing d istance for the t raff ic, road and
weather conditions .
0) Tips
-Distan ce 3 is set automatically each time
you switch the ignition on.
- Your standard settings are automatically
stored and ass igned to the remote con­
tro l key be ing used.
Setting the driving program
Applies to vehicles: with Audi adaptive cruise control
Depending on the selected driving program
and distance, driving behavior when accelerat­
ing will vary from dynamic to comfortable .
Setting the dri ving program for vehicles
without Aud i d riv e se le ct*
~ In the radio/MM!*, select: ICARlfunction
button
> Ad apti ve crui se cont rol > Drivi ng
p ro g.
> comfort, sta nd ard or dyn amic . Or
~ Select: !CAR ! function button> Ca r sys­
tem s*
control button > Driver a ssist > Adap ­
ti ve c ruis e c ontr ol
> D rivi ng program * >
Co mfort, Standard or Dynam ic .

Audi adaptive cruise control and braking guard 105
Setting the driving mode for vehicles with
Audi drive select*
Refer to r=;,poge 1 14 .
(D Tips
Yo ur setti ngs a re automatically store d an d
assig ned to the remote contro l key be in g
used.
Request for driver intervention
A pp lies to vehicles: w ith Audi a daptive cruise control
Fig. 119 Inst rumen t cl uster: reques t fo r drive r in te r·
ve ntio n
In ce rtain si tuations, t he sys tem w ill prom pt
you to take actio n. This cou ld ha ppen, for ex­
ample, if braking by the a daptive cr uise con ­
trol system is not enough to maintain enough
d istance to the vehicle ahead.
The inst rument cluste r will war n you about
the danger
r=;,fig. 119:
- A red ve hicle is pic tured in the d is pla y.
- The text
DISTANCE! appea rs in the s ta tus
b ar.
- T he r ed indi cator lig ht
I blinks .
- In add it ion, a warning tone sounds.
Audi braking guard
Description
App lies to vehicles: wi th Audi ada ptive c ruise con tro l
Fig. 120 In str um ent clus ter: approach warnin g
Brak ing guard uses a radar sensor. It also
funct ions wit hin the lim its of the system
whe n adapt ive cruise control is switched off.
What can Audi braking guard do?
When detected in time, the system can assess
situations when a veh icle ahead brakes s ud­
denly or if your own vehicle is t raveling at a
high speed and approac hing a ve hicle up
ahead that is movi ng mo re sl ow ly. B raking
guard does not reac t if it cannot detec t the
s ituation.
The system advis es yo u of various s ituations:
- The
distance wa rning is given if yo u are too
close to the vehicle ahead for a long time. If
the vehicle ahead bra kes sharply , yo u will
not be ab le to avoid a collision . The ind icator
light
I in the d isp lay comes o n.
- The
approach warning is given when a de­
tected ve hicle up ahead i n your lane is mov­
ing m uch mo re sl owly than you are or if i t
brake s sh arp ly. W hen t his war ning is g iven,
it may on ly be poss ible to avoi d a co llision
by swe rving or b ra kin g sharp ly. The indic ator
light
I a nd indic ator in t he di spl ay w ill war n
you abo ut the d ange r¢
fig . 120. You will a l­
so hear an aco ustic s ignal.
If y o u do no t rea ct fas t eno ugh o r do not r eact
at all to the si tuat ion, B rak ing guard will in­
t e rvene by b rak ing and t he message
braking
guard intervention
w ill appea r.

106 Audi adap tive cruise control and br aking guard
- If a co llision is imminent, the system will
first provide an
acute warning by bri efly and
sharp ly app ly ing the brakes .
- If you do not react to the ac ute warning ,
braking guard can brake within the limits of
the system. This reduces the veh icle speed
in the event of a collision.
- At speeds under 20 mph (30 km/h), the sys ­
tem can in it iate a complete deceleration
s hortly before a collision .
1>.
- If the braking guard senses that you are not
braking hard enough when a collision is im­
minent, it can increase the braking force.
Which funct ion s can be contr oll ed ?
You can switch braking guard and the dis­
tance/approach warning on or off in the radio
or MM I c> poge 106, Settings in the radio/
MMI.
A WARNING
Lack of attention can cause col lisions, oth­
er accidents and serious personal injuries.
The braking guard is an assist system and
cannot prevent a collis ion by itself. The
driver must always intervene . The driver is
always responsib le for bra king at the cor­
rect time.
- Always pay close attention to traffic,
even when the brak ing guard is switched
on. Be ready to intervene and be ready to
take complete control whenever necessa­
ry. A lways keep the safe and legal dis­
tance between your vehicle and vehicles
up ahead.
- Braking guard works w ith in limits and
will not respond outs ide the system lim­
its, for example when approaching a
stopped vehicle or stationary obstacle
(end of a traff ic jam or veh icle that has
broken down in traffic).
- Always remember that the radar sensor
for the braking guard works only within
defined detection and range limits that
l ) Th is is not available in some c oun tri es.
may prevent the proper detection of oth­
er vehicles.
- The radar sensor's function and range
can be reduced by rain, snow and heavy
spray. Moving veh icles up ahead may not
be prompt ly detected or may not be de­
tected at all .
- Reflective surfaces including crash barri­
ers or tunne l entrances may impair the
function of the radar sensor .
(D Tips
- You can cancel the braking that is in it iat­
ed by the system by braking yourse lf, by
accelerating not iceably or by swerving .
- Braking guard error messages
c>poge 107.
- Keep in mind that brak ing guard can
brake unexpectedly. Always secure any
cargo or objects that you are transport­
ing to reduce the risk of damage or in­
jury .
Settings in the radio/MMI
Applies to vehicles: with Audi adaptive cruise control
., Select: I CAR I function button > Car sys­
tem s*
contro l button > Driv er a ssist > Au di
br aki ng g ua rd .
Or
., Select: !CAR ! function b utton > Aud i brak-
ing gu ard .
S ys tem -
Switch A udi braking guard On and
Off . When you switch the ignition on, the
message
Audi b raking gu ard off appears if
the system is switch ed off .
Ea rly warnin g -The distance and approach
warnings in the display can be switched
On /
Off .
(D Tips
-Yo ur settings are automatically stored
and assigned to the remote contro l key
being used at the times the settings are
made.

186 Intelligent technology
ESC includes and/or works together with the
anti-lock brake system (ABS), brake assist sys ­
tem, anti-slip regulation (ASR) , e lectronic dif­
ferential lock (EDL), dynamic steering" and
e lectronic interaxle differentia l lock* /selective
wheel torque control* . ESC is switched on all
the t ime. I n certa in s ituations whe n you need
l ess t raction, you can switch
off ASR by p ress­
i ng the bu tto n
[ru ¢ page 188, fig. 176 or
¢ page 188, fig. 177. Be sure to sw itch ASR
on aga in when yo u no longer need less t rac­
tion .
Anti -lock braking system (ABS)
ABS prevents the wheels from locking up
when braki ng. The veh icle can still be steered
even d uring h ard br aking. Apply ste ady p res ­
sure to the brake pedal. Do no t pump the ped­
a l. A pulsing in the brake peda l indicates t hat
the system is he lping yo u to b rake the vehicle .
Brake assist system
The brake assis t system can decrease b ra ki ng
d ista nce. It increases braking power w hen the
d river p resses the brake pedal quic kly in eme r­
gency situations . You must p ress and hold the
brake peda l until the situation is over. In
vehicles w ith adapt ive cru ise contro l", the
brake assist system is more sensit ive if the
d ista nce detected to t he vehicle a head is too
small.
Anti-slip regulation (ASR)
ASR reduces engine power when the drive
wheels begin to spin and adapts the fo rce to
the road condit ions. This makes it eas ier to
start , accelerate and drive up hills.
Electronic differenti al lock (EDL )
The ED L brakes wheels that are spinn ing and
transfers the drive power to the other drive
wheel or whee ls if t he vehicle is equipped with
all-w heel drive*. This function is available up
to about 60 mph (100 km/h).
In extreme cases, EDL automat ica lly switches
off to help keep the bra ke on the braked whee l
from overheating. EDL wi ll switch on again au-tomat
ica lly when conditions have ret urned to
no rma l.
Dynamic steering*
On vehicles wi th dynam ic steering*, ESC he lps
st abi liz e the steer ing in cr itical situ ations.
Electronic interaxle differential lock* /
selective wheel torque control*
T he elec troni c int eraxle differentia l lock (front
whee l dr ive) o r th e se lec tive whee l torque
control (all-whee l dr ive) oper ates when dr iv ­
ing t hro ugh curves. The front wheel on the in ­
side of the c urve or both whee ls on the inside
of the c urve are b raked se lectively as needed.
This m inimizes sliding in the front wheels and
allows for more precise driving through
curves . The applicable system may not acti­
vate when dr iving in wet o r snowy cond itions.
A WARNING
- ESC, ABS, ASR, EDL dynam ic steering*
a nd the ele ct roni c interaxle d ifferential
lo ck* /se lective whee l torque con trol *
cannot ove rcome the laws of physics .
This is especially important on sli ppery
or wet roads.
If the systems beg in acting
to stabilize your veh icle, yo u should im­
mediately change your speed to match
the road and traffic conditions . Do not
let the increased safety prov ided by
these systems tempt you to take r isks.
Doing so will increase the risk of a loss of
veh icle cont ro l, col lision and ser ious pe r­
sonal injur ies.
- Always ada pt your speed to road, traffi c
a nd wea ther conditions. The r isk of los-
ing con trol of the vehicle i ncreases when
d riving too fast, es pec ia lly through
curves and o n slippe ry or wet roads, an d
when dr iv ing too close to vehicles up
ahead. ESC, ABS, the brake ass ist sys­
tem, ASR, EDL dynam ic steer ing* and the
e lectronic inte raxle differentia l lock*/se­
lec tive whee l to rque control* cannot p re-
-
vent co llisi ons. ~

188 Intelligent technology
allroad: Switching on /off
ESC turns on automatically when you start
the engine .
Fig. 176 Version A: lower ce nter console,~ OFF but­
to n
...... [ I I n-I _,,. .,., -------' -"~ __..,
Fig. 177 Versio n B: upper ce nter conso le,~ OFF but­
to n
ESC Offroad mode
In order to maintain maximum traction and
optima l brak ing when driving offroad , the
conditions for the ESC to work are reduced to
such a degree, tha t the vehicle whee ls co uld
start to spin . The stabilizing effects start to
work later wh ich results in limited vehicle sta­
b ili ty.
The ESC Offroad mode should on ly be used in
the following situations:
- Rocking the vehicle to free it when it is stuck
- Driving in deep snow or on loose ground
- Driving on rough terra in when much of the
car's weight is lifted off the wheels (axle ar­
t icu lation)
- Driving with snow cha ins
- Driving downhill while braking on loose
ground
F or your safety, switch off the ESC Offroad
mode in advance.
Switching on th e ES C Offroad mode
Press the In OF FI button ¢ fig. 176 or
¢ fig. 177 . The I indicator light turns on and
the message
St abilization cont ro l ( ES C): Off­
ro ad. Wa rning! Rest ricted stability
appears
in the disp lay.
Swit ching off th e ESC Offroad mode
Press the !.$ O FF I button again to sw itch the
ESC back on . The
IJ indicator light turns off
and the message
Stabil ization contro l (ESC ):
On
appears in the display.
_& WARNING
- You shou ld only turn on the ESC Offroad
mode when driving offroad or with snow
chains.
- Drive whee ls can sp in and you can lose
control of the vehicle more easi ly when
ASR and ESC are in Offroad mode, espe ­
cially whe n the road is slippery.
- Switch to Offroad mode only whe n your
driving skills, traff ic and weather condi­
tions permit .
(D Tips
You cannot sw itch Offroad mode on when
adaptive cruise control* is working.
Braking
What affects braking efficiency?
New brake pad s
During the first 250 mi les (400 km), new
brake pads do not possess the ir full brak ing
effect, they have to be "broken in" first¢ .&,.
You can compensate for this slightly reduced
braking power by p ushing harde r on the brake
pedal. Avoid heavy brak ing loads dur ing the
break-in pe riod.
Oper ating cond ition s and driving habit s
The brakes on today's automobiles are still
subject to wear, depending largely on operat ­
ing co nd it ions and driving hab its
¢ .&, . On
vehicles that are either driven most ly in stop-
and-go city traff ic or are dr iven hard, the
lilJ,,