2008 AUDI S6 brake sensor

• ..__A_ d_a...: p:,..._ ti_v _ e_ C_ ru_ is_ e_ C_ o_n_ t_ r_ o _ l ___________________________________________ _
& WARNING
The radar sensor's vision can be reduced by rain, snow and heavy
spray. This can result in vehicles driving ahead being inadequately
detected or, in some circumstances, not detected at all. If neces­
sary, take action yourself! •
Applies to ve hicle s: with Ad aptive Cruise Co nt rol
When driving around curves
L=~=======; ~
c'i
Entering a curve
Fig. 142 Vehicle
entering a curve
Fig. 143 Vehicle
leaving a curve
When entering a curve, the Adaptive Cruise Control may react to a
vehicle in the next lane and apply the brakes in your vehicle =>
fig. 142. The braking action can be overridden by depressing the
accelerator pedal.
Leaving a curve
At the exit from very long curves the predictive lane reading can
cause th e Adaptive Cruise Control to react to another vehicle in the
next lane and apply the brakes in your vehicle => fig. 143. The
braking action can be over ridden by depressing the accelerator
pedal. •
Applies to ve hicles: w ith Adaptive C ru ise Co nt rol
Vehicles offset to one side
Fig . 144 Vehicle trav­
eling ahead outside the
detection range of the
radar sensor
Vehicles traveling ahead and to one side cannot be detected by the
Adaptive Cruise Control until they are within the detection range of
the sensor. •

llffl __ ln_ t _e_ ll-'"ig ...,_ e_ n_t _t_ e_ c_ h _ n_o _ l_o _,.g= y,_ __________________________________________ _
Intelligent technology
Notice about data recorded by
vehicle control modu les
Your vehicle is not equipped with an Event Data Recorder (EDR),
installed by some manufacturers for the express purpose of
capturing data for retrieval after an accident or crash event . EDR's
are sometimes called "crash recorders" .
Some state laws restrict the retrieva l or downloading of data stored
by EDR's that were insta lled in a vehicle for the express purpose of
retrieving data after an accident or crash event without the owner's
consent.
Although your vehicle is not equipped with an EDR, it is equipped
with a number of electronic control modules for various vehicle systems such as, for example, engine function, emission control, as
well as for the airbags and safety belts.
These electronic control modules also record vehicle-related data during norma l vehicle operation for diagnost ic and repair purposes .
The recording capacity of the electronic control modules is limited
to data (no sound is recorded) and only a small amount of data is
actually recorded over a very limited period of time and stored when
a system fault or other condition is sensed by a control unit. Some
of the data then stored may relate to vehicle speed, direction, braking as well as restraint system use and performance in the
event of a crash or other condition . Stored data can only be read and
down loaded with special equipment .•
Electron ic Stabilizat ion Program (ESP)
General =nformation
The ESP improves the vehicle stability.
(
Fi g. 225 C ente r
co nso le w it h ES P
swi tch
ESP is designed to he lp you maintain vehic le control in situations
where the car approaches the limits of "grip", especia lly when
accelerating and cornering. ESP reduces the risk of skidding and
improves stabil ity under all road conditions .
T he system operates across the entire speed range in combination
with the ABS system. If the Anti-Lock Brake System (ABS) malfunc­
tions, the ESP wil l also shut down .
How th e sys te m w ork s
The Anti -Lock Brake System (ABS) , Electronic Differential Lock (EDU
and the Anti-Slip Regulation System (ASR) are integrated in the e lec­
tronic stabi lization program . In addition to the data provided by
these functions, the ESP control unit requires additional measure­ ment data provided by high performance sensors . The rotational
speed of the vehic le about its vertical axis, vehicle acce leration in
the fore-and-aft and lateral directions, the brake pressure and the steering angle are al l measured .

The direction in which the driver wishes to travel is determined with
t he aid of the steering angle and vehicle speed and is continua lly
compared with the actual behavior of the vehicle. If the two do not
match, for example, when the vehic le starts hydrop laning on a wet
road, ESP will automatically brake the appropriate whee l to correct
the prob lem.
The vehicle is then stab ilized by the forces acting on the whee l
during braking. If the vehicle is
oversteering (rear tends to skid out
of the turn), the brakes are mainly app lied on the wheel that is on
the outside of the curve. In the case of a vehicle that is
understeering
(tendency to sl ide out of the curve), the brakes are applied at the
rear wheel that is on the inside of the curve . An acoustic signal indi­
cates when ESP brake application cuts in
~ & .
The system operates across the entire speed range in combination
with the ABS system
~ page 262 . If the Anti -Lock Brake System
(ABS) malfunctions, the ESP wi ll be out of action as well.
Ac tivat ing
When you turn on the eng ine, ESP will automatically be activated
and will perform a se lf -test . As soon as the test is comp leted, the
system is in norma l operating mode.
You can activate a deactivated ESP or deactivated ESP/ASR if required by pressing the~
page 258, fig. 225 button . When they are
activated, the message
E S P/AS R on appears briefly in the display.
D eactiv ating
The ESP should normally be activated al l the time . If necessary, you
can deactivate An ti- Slip Regulation (ASR) or the E lectronic Stabiliza ­
tion Program (ESP) by pressing the button~
page 258, fig. 225.
• Dea ct ivat ing A SR: Tap the button . In certain exceptional situa ­
tions (e.g. driving with t ire chains) , the Anti-Sl ip Regulation (ASR)
can be deactivated ~
page 260. The message ASR off appears in the
display as we ll.
• Dea ctiv at ing E SP/ASR Press the button for more than 3 seconds.
With the ESP/ASR deactivated, the ESP check light comes on, see
Controls and equip­
ment Safety first Vehicle operation
In
te llig ent tec hn olo gy
~ page 19 . The message ES P sw itched off appears in the disp lay as
we ll.
& WARNING
The Electroni c Stabili zation Program i s never thele ss subject to the
la ws o f physics . It is p articularl y import ant t o pay a ttent ion t o th is
f a ct on wet and slippery road s. It is ther efore important tha t y ou
a lw ays a dapt your dr iving to the c ondit ion of th e ro ad and t raffi c
c ondition s. Do n ot allow the inc rea sed safety pro vided b y th e Elec ­
tr on ic S ta bili zatio n Pr ogram sys tem to lull you in to acc epting
add iti onal safet y risk s. C
Electronic differential tock (EDL)
The electronic differential lock monitors the rotational
speed of the drive wheels.
Gener al note s
The electronic differential lock (EDU helps the car to start moving,
accelerate and c limb a gradient on surfaces providing poor or
almost no grip . Without EDL, this would be difficult, if not impos ­
sib le .
How th e sys te m wo rk s
The EDL operates automatical ly . It monitors the rotational speed of
the drive wheels on an axle with the he lp of the ABS sensors
~ page 262 . If a noticeable difference in rotational speed between
the drive wheels on one axle is detected (e.g. on slippery ground
on
one side),
the spinning wheel is braked, thereby transferring power
to the other drive wheel or whee ls (a ll -whee l drive) . Th is is done up
to a speed of about 60 mph ( 100 km/h). Noises from the brake
system signal that wheel spin is being control led .
Dr iving off
When driving off , always be sure to keep road conditions in mind as
you accelerate. If one drive wheel spins because it is on a surface
Iii>
•
Vehicle care Do-it-yourself service Technical data

___ ln_ t _e_ ll-'"ig ...,_ e_ n_t _t_ e_ c_ h _ n_o _ l_o _,.g= y,_ __________________________________________ _
with less grip, gradually increase the pressure on the accelerator
pedal until the car starts to move.
Overheating of brakes
To prevent the disc brake of the braked wheel from overheating if
subjected to excessive loads on this wheel, the EDL cuts out tempo ­
rarily. The vehicle remains operational and behaves in the same way
as a vehicle without EDL.
As soon as the brake has cooled down, EDL switches on again auto ­
matically.
& WARNING
• When accelerating on slippery surfaces, such as on ice or snow,
always be careful when depressing the accelerator pedal. Even
with the EDL working, the drive wheels can spin and reduce your
ability to control your car. Risk of crash!
• The increased safety afforded by EDL does not mean that you
can take safety risks. Always adapt your driving style to the road
conditions and traffic situation.
[ i] Tips
If a fault occurs in the ABS, the EDL is also not functioning. This is
indicated by the ABS warning light=>
page 22. •
Ant"-Slip Regulation System (ASR)
The Anti-Slip Regulation System prevents the driven
wheels from spinning when the car is accelerating.
General notes
The Anti-Slip Regulation System (ASR) is integrated in the electronic
stabilization program (ESP). When the vehicle starts up and acceler ­
ates, the wheels are prevented from spinning by adjusting the engine power to match the amount of grip available from the road
surface.
How the system works
ASR
performs automatically, i.e. without the driver's intervention.
With the aid of the ABS sensors=>
page 262, ASR monitors the
speed of the driven wheels. If the wheels start to spin, the engine
torque is reduced automatically until the tires find enough grip to
lock onto the road surface. The system is active across the entire
speed range.
Th e ASR works in conjunction with the ABS. If a malfunction should
occur in the ABS, the ASR will also be out of action.
Activating
The ESP is automatically activated when the engine is started and it
performs a self -test . You can activate a deactivated ASR if required
by pressing the =>
page 258, fig. 225 button . When it is activated,
the message
ESP/ASR on appears briefly in the display. Vehicles
with front-wheel drive a deactivated ASR automatically re-activates
itself at a speed of 40 mph (70 km/h) .
Deactivating
You can deactivate the ASR if required by pressing the button (for
less than 3 seconds)=>
page 258, fig. 225. With the ASR deactivated,
the ESP check light comes on, see=>
page 19. The message ASR off
appears in the display as well. On vehicles with front-wheel drive:
deactivation is possible only up to 30 mph (50 km/h) for safety
reasons . Vehicles with all -wheel drive: the ASR can be deactivated
at any speed .
The ASR should normally be activated all the time. Only in certain
exceptional situations when some slip is desirable does it make
sense to deactivate the ASR. Examples:
• when driving with tire chains
• when driving in deep snow or on loose ground and
• when rocking the vehicle loose after it has become stuck .

& WARNING
Although the ABS is very effective, always remember that braking
capability is limited by tire traction. Always adjust your driving
speed according to the road and traffic conditions. Do not let the
extra safety afforded by the ABS tempt you into taking extra risks.
The ABS cannot overcome the laws of physics.
[ i] Tips
• If ABS is not functioning properly, a warning light will come on .
See
=> page 22.
• If a fault occurs in the ABS , the EDL is also not functioning. This
is indicated by the ABS warning light. •
Brake assistant
The brake assistant is designed to achieve the optimum
braking effect.
The brake assistant helps to increase the effective braking power
and thus to achieve a shorter stopping distance . If the driver
presses the brake pedal very quickly, the brake assistant automati ­
cally boosts the braking force to the maximum level, up to the point
where the anti-lock brake function (ABS) intervenes to stop the
wheels from locking. You should then keep the brake pedal pressed
until the vehicle has braked to the required speed. The brake assis ­
tant switches itself off as soon as you release the brake pedal.
The brake assistant will not be operative if there is a malfunction in
the ABS.
In vehicles with Adaptive Cruise Control* (ACC), the distance to the
vehicle ahead is continuously calculated using a radar sensor,
within the limits of the system=>
page 135. If the radar system
detects a short distance to the vehicle ahead, the brake system
exerts a small braking force to reduce the brake response time in
Controls and equip­
ment Safety first Vehicle operation
Intelligent technology
case of braking. In this way, the brake application can be quickened
and
the stopping distance reduced.
& WARNING
Please remember that the accident risk always increases if you
drive too fast, especially in corners or on a slippery road, or if you
follow the vehicle ahead of you too closely. Increased risk of an accident cannot be compensated for even by the brake assistant,
so always maintain a safe speed.
n
Servotronic® -advanced power
steering system
The power steering systems uses the power of the
running engine to allow precise steering with little effort.
The advanced Servotronic ® power steering system senses the road
speed and electronically adjusts power assistance to provide
comfortable and safe steering response exactly matched to the
vehicle speed.
Power steering will not work if the engine is off. As a result, the
steering wheel will be hard to turn.
The power steering fluid level is checked during the scheduled
maintenance services.
0 Note
If there is an electronic malfunction, servotronic will still function
like a conventional power steering system, providing a constant
steering support force that is no longer proportionate to the vehicle
speed. This is most noticeable when turning the steering wheel at
low speeds (for example when parking), -more effort will be
required than usual.
II-
Vehicle care Do-it-yourself service Technical data

lllffll,.___T_ ir_e _ s_ a_ n_ d _ w __ h_e _e_ l_ s _______________________________________________ _
& WARN ING (continued )
• All four wheels mu st be fitted with radial tires of the same type,
si ze (rolling cir cumference ) and the same tread pattern. Driving
with different tires redu ces vehicle handling and can le ad to a loss
of control.
• If the spare tire is not the same as the tires that are mounted
on the vehi cle -for e xample with winter tires -only use the spare
t ire for a short period of time and drive w ith extra care . Refit the
normal road wheel as soon as safely possible.
• Never drive faster than the maximum speed for whi ch the tires
on your vehicle are rated becau se t ires that are driven faster than
their rated speed c an fail suddenly .
• Overload ing tires cause heat build-up , sudden tire failure,
including a blowout and sudden deflation and loss of control .
• Tempe rature grades apply to t ires that are properly inflated and
not over or underinflated.
• Fo r techni cal reasons it is not always possible to use wheels
from other vehicles -in some cases not even wheels from the
same vehicle model .
• If you install wheel trim discs on the vehicle wheels , make sure
that the air flow to the brakes is not blo cked . Reduced airflow to
the brakes can them to overheat , increasing stopping distances
and causing a collision .
• Run flat tires may only be u sed on vehicles that were equipped
with them at the factory . The vehicle must have a chas sis designed
for run flat tires and a factory -installed tire pressure monitoring
system that indi cates a loss of tire pressure . In corre ct u se of run
flat tires can lead to vehicle damage or accidents . Check with an
authori zed Audi dealer or tire specialist to see if your vehicle can
be equipped w ith run flat tires . If run flat tires are used , they must
be installed on all four wheels . Mi xing tire types is not permitted.
0 Note
• For technical reasons, it is not ge nerally poss ible to use the
whee l rims from other vehicles. This can ho ld t rue for whee ls of the
same ve hic le type.
• I f the s pa re tire is diffe rent from the tires that you have mo unted
o n your veh icle ( for e xample w inter t ires or w ide pro file t ires), the n
use the spare tire for a short period of time on ly and drive with extra
ca re. R ep lace the flat t ire w ith th e ti re m atc hin g the o thers o n your
vehic le as soon as possib le.
• I f you should put different w hee ls and t ires o n you r ve hicle (e.g.
winter wheels and tires), you must be certain that the wheels and
t ires are co mpat ible w ith the tire pressure monit oring syst em.
Otherwise the system will register a ma lfunction and a fau lt
m essage w ill be d isplayed . For more info rmatio n, con tact your Aud i
dea ler.
0 Note
• When insta lling new tires, be carefu l not to damage the va lves or
t ire pressu re m oni toring sys te m sensors .
• N ever drive without the valve stem cap. The va lves could get
damaged.
• I f the sensors must be replaced, then the valve must also be
r ep laced at t he same t ime .
~ For the sake of the environment
Dispose of o ld tires i n acco rdance wit h the local requ ire men ts .•
Uniform tire quality grading
• Tr ead wear
• Tr action AA A B C
• T emperature A B C

llft!I Fuses and bulbs ..._ __________________________________________ _
[ i J Tip s
You are wel l advised to keep a supply of spare fuses in your vehicle .
Fuses with the proper ampere ratings are availab le at your Audi
dea ler. •
Fuse Location , Instrument Panel left
Fig . 258 Fuse pa nel
l ayo ut
Some of the equipment items listed are optional or only ava ilable on
certain model configurations .
Note th at t he fo llo wi ng t able i s acc urat e at th e time of goin g to
pr ess and is subject t o ch ang e. In th e eve nt of d iscrep ancie s, th e
labe l on th e in side of th e cover always ta kes prece de nce .
The power seats are protected by cir cuit br eaker s, which automati­
cally reset after a few seconds after the overload has been reme ­
died.
N o. Equipm ent
1 Not used
2
3
4
Not used
Engine management
Oil level sensor Amps
5
5
No
.
5
6
..
7
8
9
10
1 1
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Equipm ent
Climate cont rol , tire pressure monitoring sys ­
tem
Electronic Stabilization Program (ESP), clutch
sensor
Diagnostic connector
Homelink control unit
Automa tic dimming interior mirror
Adaptive Cruise Control
Not used
Diagnostic connector
Switch modu le steering column
Brake light switch
I nstrument c luster, control module Ga teway
Telephone, cell phone E lectronic Stabilization Program (ESP)
Headlight electronics, left -side
Rain sensor
Heated washer nozzles
Seat adjustment (driver)
MMI display
E lectromechanica l parking brake
Not used
Not used
Not used
N ot used
Not used Amps
5
5
5
5
5
5
10
10
5
10
10
10
5
5
5
10
5
5
-

Alphab eti ca l ind ex -
-------------=----
Anti-loc k brake syst em
H ow the ABS system works ....... . 262
War ning/i ndicato r lights ... ....... .. 22
Anti -Slip Regulation System (ASR)
How the system works ............ 260
Anti-theft systems Anti-theft alarm system . .... .... ... 61
Electronic immobilizer ... .. .... .... 51
Ti lt sensors . ... .. .... ..... .. ... ... 62
Ashtray Front . ...... .... .... ...... .... .. 104
Rear .... ... .. .... .... ... .... .... 105
ASR How the Anti -Slip Regu lation System
works . ... .. .... .... ... .... .... 260
As terisk
What does it mean when something is marked with an asterisk? .. ... ...... 6
Audi Parking System Acoustic parking sys tem tips ...... . 179
Adjusting the chimes -option 1 ... .. 178
Adjusting the chimes -option 2 ... .. 179
General Information ... .. .... .... . 167
Notes on distance information ..... 177
P arking next to obstacles .......... 176
rear . .............. .......... ... 167
rear, with rear-view camera ........ 169
Rear -view camera -parking mode 1 173
Rear -view camera -parking mode 2 . 175
Rear -view camera (Rear View) .. .... 17 1
Rear -view camera coverage area . ... 173
Rear-view camera tips .. ...... .... . 180
Specia l parking situations .... .... . 176
Controls and equip­
ment Safety first
Audi Parking System
(rear)
Adjusting the chimes ... .. .... .... 168
Audi Service Repair Manua ls and Li terature
366
AUTO mode AC climate contro ls ............... 113
Au to Safety Hotline ..... .... .... ..... 201
Auto -Check Control .. .... ...... ....... 30
Automatic belt retractor ... .. .... .... . 206
Automatic car wash
See Was hing .. ... ..... ....... .... 279
Automatic Shift Lock (ASU ........ 155, 162
Automatic transmission
6 -speed automatic transmission .. .. 153
Automatic Shift Lock (ASU ... .. 1 55, 162
Driving .......................... 153
Dynamic shift program ............ 156
Emergency release for selector lever 159
Emergency release for selector lever
(mult itronic®) ...... .... .... .... 1 66
Fail -safe mode . ...... .... .... .... 158
I gnition key safety lock ............ 125
Kick -down . ....... .... .... .... ... 156
Manual shift program ............. 157
multitronic® ................... .. 159
Selector lever ................ 154, 161
Shift buttons ................ 158, 165
Steering wheel with tiptron ic® . 158, 165
Average speed ....................... 40
Avo id damaging the vehicle ...... .... . 269
B
Battery .. ........ ....... ........ ... 307
Battery location inside the lu ggage
compartment . ...... ... .... .... . 308
Charging .. .... ....... ..... .... .. 3 10
Important warnings when working on the
battery ...... .... ... .... ...... . 308
J ump starting ..... .... ... .... .... 35 1
Low ...... ... .... .... ...... ... .. 265
Replacing the battery ..... .... ... . 311
State of charge . .... ...... .... ... . 265
Voltage .. .... .................... 37
Winter operation ......... .... .... 307
Working on the battery ........ .... 308
Before driving ... .... .... ..... .. .... 193
Blended gasoline ...... ... .... .... ... 29 1
Body cav ity sealing .......... ........ 284
Booster seats .. ... .. .... .... .... ... . 242
How do I properly insta ll a b ooster sea t in
my vehicle? ....... ........ .... . 24 2
Safety instructions ................ 242
Brake assistant ....... ... .... .... ... 263
Brake booster .. ...... .... ... .... .... 262
Brake fluid Changing the brake fluid .......... . 307
Checking the brake fluid leve l ...... 306
Reservoir .. .... .... ............. . 306
What is the correct brake fluid leve l? 306
What should I do i f the brake f luid warning
light comes on? .. ....... ........ 306
Brake light Defective ... .. .... .... .... ...... .. 27
Vehicle operation Vehicle care Do-it-yourself service Technical data