check engine light AUDI RS5 CABRIOLET 2015 Owners Manual

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Reporting Safety Defects . . . . . . . . . . . 120
Active ro llover protection system 121
Safety belts . . . . . . . . . . . . . . . . . . . 123
General notes ..... .... ... .. .. .. . .
Why safety be lts? ..... ... .. .. .. . .
Safety belts ............. .... .. . .
Safety belt pretens ioners .. .. .. .. . .
Airbag system ............. .. . .
Important things to know .. .. .. .. . .
Front airbags ............ .... .. . .
Mon itoring the Advanced Airbag
System ...... .............. ... . .
Knee ai rbags .... .... ... .. .. .. .. . .
Side airbags .. ........... .. .. .. . .
Child Safety ... .. ...... .. .. .. . .
Impor tant th ings to know .. .. .. .. . .
C hi ld safety se ats ......... .... .. . .
I ns tall ing a chi ld sa fety seat . ...... .
L A TCH Lower anchorages and tethe r
for chi ld ren ..... .. .... ... .. .. .. . .
Addit ional Information
Vehicle operat ion ..... .. .. .. . .
Intelligent technology .. .. .. . .
Not ice about data recorded by the
Event Data Recorder and ve hicle
control modules ............... .. .
Elect ronic S tabilization Control (ESC) .
B raki ng .. ... ............. ... ... .
E lect ro-me chanical power assis t,
dynam ic steering ......... .... .. . .
D riving w ith your quat tro . ... .. ... .
E nergy management ... ... .. .. .. . .
Driving and environment ... ..
The first 1,000 miles (1 ,5 00 km) and
afterwar ds ..... .. .... ... .. .. .. . .
Avoid damaging the vehicle ... .. .. . .
Driving through water on roads . .. . .
Warming up and cooling down .. .. . . 123
124
126
129
131 131
135
14 1
146
1 4 8
152
152
1 58
16 2
166
169
170
170
170
17 1
174
175
176 177
179 179
179
179
180
Cata lytic converter . . . . . . . . . . . . . . . . 180
Shutt ing down veh icle . . . . . . . . . . . . . 181
Operate you r vehicle econom ica lly and
minim ize po llution. . . . . . . . . . . . . . . . 18 1
Table of contents 3
Vehicle care . . . . . . . . . . . . . . . . . . .
184
Vehicle care and cleaning . . . . . 184
Genera l information . . . . . . . . . . . . . . 184
Car washes . . . . . . . . . . . . . . . . . . . . . . 184
Cleaning and care information . . . . . . 185
Fuel supply and filling your
fuel tank . . . . . . . . . . . . . . . . . . . . . . .
190
Gasoline . . . . . . . . . . . . . . . . . . . . . . . . 190
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . 191
Checking and filling . . . . . . . . . . . 195
E n gine hood . . . . . . . . . . . . . . . . . . . . . 195
Engine compartment . . . . . . . . . . . . . . 197
E ngine oil . . . . . . . . . . . . . . . . . . . . . . . 197
En gine cooling sy stem . . . . . . . . . . . . . 201
Br ake fluid . . . . . . . . . . . . . . . . . . . . . . 20 4
Battery . . . . . . . . . . . . . . . . . . . . . . . . . 205
Windshie ld/headlight* washer
container . . . . . . . . . . . . . . . . . . . . . . . 208
Tires and wheels . . . . . . . . . . . . . . 2 10
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Tire pressure monitoring system 239
Do-it-yourself service . . . . . . . . . 242
What do I do now? . . . . . . . . . . . . 24 2
Vehicle tool kit . . . . . . . . . . . . . . . . . . . 242
Tire repair . . . . . . . . . . . . . . . . . . . . . . . 242
Chang ing a wheel . . . . . . . . . . . . . . . . . 244
Fuses and bulbs . . . . . . . . . . . . . . . 250
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
Bul bs. . . . . . . . . . . . . . . . . . . . . . . . . . . 253
Emergency situations . . . . . . . . . 255
General . . . . . . . . . . . . . . . . . . . . . . . . . 255
Star ting by pushing o r towing . . . . . . . 255
Start ing with jumper cables . . . . . . . . 255
U se of j umpe r cables . . . . . . . . . . . . . . 256
E mergen cy towing wit h commercia l
tow truck . . . . . . . . . . . . . . . . . . . . . . . 257
Lifting vehicle . . . . . . . . . . . . . . . . . . . . 259
Technical data . . . . . . . . . . . . . . . . . 261
Technical Data . . . . . . . . . . . . . . . . . 261
Vehicle identification . . . . . . . . . . . . . . 261
Weights . . . . . . . . . . . . . . . . . . . . . . . . 261
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Instrument s and warning /indicator lights 11
A WARNING
- Always observe the warning in
c::> page 195 , before opening the hood
and checking the engine coolant level.
- Never open the engine hood if you see or
hear steam, or if you see engine coolant
dripping from the engine compartment.
You could burn yourself. Let the engine
cool off first so that you cannot hear or
see any steam or engine coolant .
(D Note
-Mounting additional lights or accessories
in front of the air inlets reduces the cool­
ing effect of the rad iator. At high outside
temperatures or high eng ine load , the
engine could overheat.
- The front spoiler has been designed to
properly distribute the cooling air when
the veh icle is moving .
If the spoiler is
damaged , this cou ld reduce the cooling
effect and the engine co uld then over­
heat. Ask your authorized Aud i dealer for
assistance.
Tachometer (engine rev counter)
The tachometer indicates the engine RPM
(revolutions per minutes).
I f engine RPM drops below 1,500, you should
downshift to the next lower gear . T he red area
at the end of the scale indicates maximum
perm issible engine RPM after the break-in pe­
riod. Before reaching this area, move these­
lector lever to position 0/5 or ease your foot
off the accelerator pedal.
@) Note
The tachometer needle@c::> page 10 ,
fig. 3 shou ld only briefly be in the red
zone: you could damage your engine! The
beg inning of the red zone varies depend-
ing on the engine .
@) For the sake of the environment
Upshifting early saves fuel and reduces en­
gine noise.
~ button
Fig. 4 SET button in th e ins trume nt cluster
The !SET ! button performs the following func­
tions:
Switching on time, date, temperature
display and odometer
The display appears for approximate ly 30 sec­
onds when you press the
I S ET ! button c::> fig . 4
with the ignit ion off .
Starting the Auto-Check sequence
The Auto-Check system constantly monitors
certa in individual functions and components
of the vehicle when the ignition is turned on
and when the vehicle is moving .
With the ignition turned on, you can start the "Auto-Check sequence" by pressing the
! SE T!
button . You can perform an Auto-Check se­
quence when the vehicle is stationary and the
ignition is turned on or when the vehicle is
moving slower than 3 mph (5 km/h).
In addition, the number of keys initialised for
your vehicle is displayed.
L2 3 /3 means that
three keys have been initialised . This feature
enables used car buyers to make sure they
have received all of the keys.
If you are given only two keys, for ins tance ,
you should take the vehicle and the ex isting
keys to an authorized Audi dealer to have the
missing key d isabled .
It is also important to
notify your insurance company about the loss.
Setting the speed warning
By pressing the !SET ! button briefly, you can
set threshold 1 of the speed warning wh ile
you are driving
c::> page 80 . By maintaining II>

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Instrument s and warnin g/indic ator ligh ts 13
misfiring and fuel could enter into the ex ­
haust system . The catalytic converter
could then overheat and be damaged .
Warning/indicator
lights
Description
The indicator lights in the instrument cluster
blink or turn on. They indicate functions or
m alfunctions
c::> .&. .
Messages may appear with some indicator
lights. A warning signal will sound at the
same time . The messages disappear again af­
ter a short t ime. To display a message again,
press the
I S ET I bu tton c::> page 11 . If several
malfunction s occur, each of the indicator/
warn ing lamps will be d isplayed in succession
for about two seconds at a time.
Some ind icators ligh ts in the display can turn
on in several colors.
A WARNING
- Failure to heed warning lights and other
important vehicle info rmation may result
in serious personal injury o r vehicle dam­
age.
- Whenever sta lled or s topped for repa ir,
move the vehicle a safe dis tance off the
road, stop the engine, and turn on the
emergency flasher
c::> page 53.
- T he engine compartment of any motor
vehicle is a poten tially hazardous a rea.
Before you check anything in the engine
compartment, stop the engine and let it
cool down. Always exercise extreme ca u­
t ion when working under the hood
c::> page 195.
Overview
Some ind icator lights turn on briefly to check
the function of that system when you switch
the ignition on . T hese systems are marked
with a./ in t he followi ng tab les. If one of
these ind icator lights does no t turn on, there
is a malfunction in that system.
R ed indicator lights
-------------
U S A models:
Brake system ./
c::> page 15
Canada model s:
Brake system ./
c::>page 15
USA m odel s:
Electromechanical par king b rake
c::> page 16
Canada models :
Electromechanical parking brake
c::> page 16
Safety belts
c::> page 16
Electrome chanical stee ring ./
c::> page 175
Batte ry
c::> page 16
Eng ine oil pressure
c::> page 17
E ngine oil level
c::> page 17
Engine cool ing system
c::> page 17
Steering column lock
c::> page 18
Ignition lock
c::> page 18
USA model s:
Speed warning system
c::> page 80
Canada model s:
Speed warning system
c::> page 80
Adaptive cru ise control./
c::> page 92
Y ellow indic ator light s
-------------
Power top operation
c::> page 43
Electron ic Stabili zation Control
( E SC) ./
c::> page 18 ..,

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Instrument s and warnin g/indic ator ligh ts 15
Adaptive cruise contro l*
~ page 92
High beam
~page 52
BRAKE /((J)) Brake system
The light i llum inates when the ignition is
switched on. It goes out after the engine has been started . Th is indicates that the brake
warn ing light is functioning properly .
If the brake wa rning light doe s not light up
w hen t he engine i s cr an ki ng , th ere ma y be a
malf unct ion in the ele ctric a l s ystem. In th is
c as e, c ont act your author ize d Audi dealer .
If the brake system warning/ind icator light
turns on, there is a brake system malfunction.
1111 ( USA mod els)/ . (Canada m odel s)
Stop veh icle and che ck brake f luid le vel
If the indicator light t urns on and the mes ­
sage appears, proceed as follows :
i.. Pull off the road .
1> Stop the vehicle.
1> Turn off the engine.
1> Check the brake flu id level ~ page 204.
1> Contact your nearest authorized repair fa-
ci lity if necessary.
W arning! Fault in br ake sy ste m . Conta ct
de aler
If the ABS indicator light rJl1 (USA mode ls)/
ii] (Ca nada models), the ESC ind icator light
GJ and the b rake system indicator ligh t
1111 (USA models);II (Canada models) turn
on and the message appears , the ABS, ESC
and braking distribution are not working
~ & .
Ca re fully drive to yo ur au thorized A ud i dealer
immed iately to have the malfunction correct ­
ed ~& -
1111 (USA m odels)/ . (Canada m odel s)
Parkin g brake sy ste m f ault! See own er' s
ma nual
- If the indicator light and the message ap­
pear
when stati onary o r aft er swit ching the ignition on
,
check if you can release the
parking brake. After releasing the parking
brake, carefully drive to your authorized
Audi dea ler immediately to have the ma l­
function correc ted. If you cannot release the
parking brake, seek professional assistance.
- If the ind icator light and the message ap ­
pear
w hile d riving , the emergency brak ing
function may not be available. It may not be
possible to set the park ing b rake or release
it once it has been set . Seek profess ional as­
sistance .
(USA models): If the warn ing light
1111 and
the warn ing light
Ei'J appear together, imme ­
diately contact your authorized Audi dealer or
qualified workshop to have a ll brake pads in­
spe cted
~ page 20.
When the light comes on, an aud ible warning
s ignal is also g iven .
A WARNING
-Always observe the warn ings in
Q page 195, before openi ng the hood
and checking the brake flu id.
- Driving with low brake fluid is a safety
ha zard . Stop the car and get professiona l
assis tance.
- I f the
1111 (USA models) ;II (Canada
models) brake system ind icator light
turns on together with the ABS and ESC
indicator lights, the ABS/ESC regulating
function may have failed. Functions that
stabilize the vehicle are no longer avai la­
ble. This could cause the vehicle to
swerve and increase the r isk of slid ing .
Drive carefully to the nearest authorized
Aud i deale r or other q ualified workshop
and have the malfunction corrected .
- If the brake warning/ind icator light does
not go out after a few seconds and the
pa rking brake is re leased, or lights up
while you are dr iving, t he f lu id leve l in
the brake fl uid reservo ir is too low. If you
believe that it is safe to do so, proceed
immediate ly at low speed to the nearest
Ill-

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Instruments and warning/indicator lights 17
9::;r: Engine oil pressure
The red engine oil pressure warning symbol
requires immediate service or repair . Driving
with a low-oil-pressure indication is likely to
inflict severe damage to the engine.
• Turn off engine! Oil pressure too low
If the indicator lig ht t urns on and the mes­
sage appears, the oil pressu re is too low.
~ P ull off the road.
~ Stop t he vehicle .
~ Turnoff the engine.
~ Check the engine oil level¢ page 199.
~ If the engi ne oil leve l is too low, add engine
o il ¢
page 199. M ake sure that the oil p res­
s ur e warning symbol. appea rs no longe r
in t he di sp lay before y ou s tart driving aga in.
~ If the engi ne oil leve l is corr ect and the in di­
cat or lig ht still tur ns o n, tur n t he eng ine
off
and do not contin ue d riving . Seek professio ­
nal assistance.
(D Tips
- The engine oil pressure symbol. is
not an indicator for a low engine oil lev­
el. Do not rely on it. Instead, check the
oil level in your engine at regular inter ­
vals, preferably each time you refuel,
and always before going on a long trip.
- The yellow oil level warning indication
II requires oil refill or workshop serv­
ice without delay. Do not wait until the
red oil pressure warning. starts to
flash before you respond to the low oil level warning
El . By then, your engine
may already have suffered serious dam­
age .
~ . Engine oil level
• WARNING : Please add oil immediately
If th e i ndi cator lig ht and the message appear,
add engine o il imme diate ly
¢page 197.
El Add oil, max XXXX l. You may cont . driv .
When the symbol Ill and dr iver message ap ­
p ear, add the amount of oil appearing in the
display at the next opportunity ¢
page 197 .
-L Engine cooling system
A malfunction in the engine cooling system
must be rep aired as soon as possible.
• Turn off engine and check coolant level
If th e i ndica to r li ght turns on and the m es­
sage appea rs, t he coolan t temperature is too
high o r th e coolan t leve l is to o low.
~ Pull off t h e road.
~ Stop the vehicle.
~ Tu rnoff the engi ne.
~ Che ck cool ant leve l.
~ Add coo lant if necessary¢ page 202.
~ Con tinue dr iv ing o nly afte r the engine cool ­
ant warning/indicator light goes out .
~ Contact your authorized Audi dealer for as-
sistance if necessa ry .
If the engi ne coo lant level is correct, t hen the
r adiator fan may be the ca use of t he malfunc­
tion.
A WARNING
- If you r vehicle should brea k dow n for
mechanical or other reaso ns, park at a
safe d istance fro m moving traffic, tu rn
off th e e ngin e and tu rn o n the haza rd
war ning lig hts¢
page 53, Eme rge ncy
fl as her s.
-
- Nev e r ope n the hood if y ou s ee or he ar
st eam or cool ant esc aping fro m the en­
g in e c omp artmen t - y ou risk b ein g sc ald ­
e d. Wa it unt il you c an no lo nger see o r
hea r steam o r coolant escap ing .
- Th e engi ne comp artme nt of any vehi cle
is a dan ger ous are a. B efo re you pe rform
a ny work in the engi ne com partment,
tur n of t he engine and allow it to coo l.
Follow t he warn ing sticke rs ¢
pag e 195.

20 Instruments and warning /indicator lights
illuminates while you are driving, or if it starts
to blink, then there is a malfunction some­
where in the system . If the light does not illu­
minate when you switch the ignition on, this
also means there is a malfunction.
A WARNING
If you have a malfunction in the safety sys­
tems, contact your author ized Audi dealer
immediate ly . Otherw ise the safety sys­
tems may not work properly in an acci­
dent.
( 0) Worn brake pads
[iJ Brake pads!
If the warn ing l ight illuminates, immediately
contact your authorized Audi dealer or quali­
fied workshop to have all bra ke pads inspect­
ed. On USA models the warning light
[iJ
comes on together with the warning light
1111. Both sets of brake pads on an axle
must always be replaced at the same time .
A WARNING
Driving with bad brakes can cause a colli­
sion and serious personal injury .
- If the warning light
[iJ and the warning
light
11111 ) with the message Brake
pads!
comes on in the instrument cluster
display, immediately contact your au­
thorized Aud i dealer or qualified work­
shop to have all brake pads checked or
replaced if necessary.
EPC Electronic power control
This warning/indicator light monitors the
electronic power control .
The 13:a warning/indicator light (Electronic
Power Control) illuminates when you switch
the ign ition on as a function check.
l) - : USA mod els onl y
-
(D Tips
If this warning/indicator light illuminates
while you are driving, then there is a mal­
function in the engine electronics. Have
the malfunct ion corrected as soon as pos­
s ible by your authorized Audi dealer or a
qualified repair facility .
o Malfunction Indicator Lamp (MIL)
The Ma lfunction Indicator Lamp (MIL) is part
of the On-Board Diagnostic (OBD II) system.
T he symbo l¢• lights up when the ignition is
switched on and will turn off after the engine
has started and has settled at a constant idle
speed. This indicates that the MIL is working
proper ly.
T he warning light illuminates when the re is a
malfunction in the engine electronic system.
Contact your a uthorized Audi dea ler and have
the malfunction corrected.
An improperly closed fuel filler cap may a lso
cause the MIL light to ill uminate ~ page 192.
For more information <=? page 28.
!7 Engine speed limitation
App lies to vehicles: wi th engine speed l imitatio n
111 Do not exceed max. engine speed of
XX.XX rpm
The eng ine speed is automatically limited to
the speed displayed in the driver information
system. This protects the engine from over ­
heating.
T he eng ine speed limitation deactivates once
the engine is no longer in the critical tempera­
ture range and you have re leased the accelera­
tor pedal once.
If the engine speed limitation was activated
by an engine control malfunction, the indica-
tor light
13:a also turns on. Make sure that the
speed does not go above the speed displayed. "'"

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Instruments and warning/indicator lights 21
Drive to your authorized Aud i dealer immedi­
ately to have the malfunction corrected .
~ .... Engine oil sensor
• Oil level! Sensor defective
If the symbol illuminates, contact your au­
thorized Audi dealer and have the oi l sensor
inspected . Until you have this done, check the
oil leve l each time you refuel just to be on the
safe side
,=;,page 199.
Bil Tank system
liD Please refuel
If the indicator light turns on for the first
time and the message appears, there are
about 2.1- 2.4 gallons (7 -9 liters) of fuel left
in the tank. Time to refuel
,=;,page 191.
Ii'] Fuel tank system malfunction! Contact
dealer
If the indicator light turns on and this mes­
sage appears, there is a malfunction in the
tank system.
Drive to your au thorized Aud i dea ler immedi­
ately to have the mal function corrected .
Ill Please refill washer fluid
If the symbol illuminates, add windshield
washer fluid to the washer system and also to
the headlight washer system*¢
page 208.
~ Windshield wipers
E!I Windshield wiper defective
There is a malfunction with the windshield
wipers.
Drive to you r autho rized Aud i dealer immedi­
ately to have the malfunction corrected.
~/0$ Defective light bulb warning
If the J:I ind icat or light turns on, a bulb has
failed . The message indicat es the location of
the bulb .
- If the
II indicator light also turns on, then
a rear fog light has failed . Th e position of
the indicator l ight cor responds with the lo­
cation on the vehicle.
This warning can also occur if the light switch
is in an unengaged position between two sym­
bols .
Vehicle lights : System fault!
If the message appears, there is a malfunc­
tion in the headlights or light switch.
Drive to your authorized Audi dealer immedi­
ate ly to have the malfunction corrected.
_& WARNING
- Light bulbs are pressurized and could ex­
plode wh ile they are being changed caus­
ing serious personal injury.
- Work with due care when handling the
high-voltage sect ion of gas discharge
(xenon) lights. Failure to do so could re­
sult in death or serious injury.
@ Tips
Have the bulb replaced or the connect ion
repaired by your authorized Audi Service
department .
i,0 Headlight range control
ID Headlight range control defective !
If the symbol ID illuminates, the dynamic
headlight range control is no longer working
properly . Have the system checked and re­
paired at your authorized Audi dea ler.
§0 Adaptive Light
App lies to vehicles: with adaptive ligh t
f!J Audi adaptive light: defective

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Driver information
display
Introduction
The Driver information display inside the in­
strument cluster provides you, the driver,
with important information .
Fig. 7 Instrument cl uster: ce nter display
Fi g. 8 Wiper lever: controls for the menu display
Center d ispla y
With the ignition on, the display in the Dr iver
I nforma tion System shows the fo llowing in­
formation :
- CD* inserted or Radio* station set
- Outs ide temperature*: At temperatures be-
low 41 °F (+S
0 (), a snowflake symbol ap­
pears in front of the temperature display
c::>&_ .
- Warning if one of the doors, front lid or en-
gine compartment lid is not closed .
Additional function s
You can open the following functions in the
Driver Informat ion System display by pressing
the
! RESET I button c::> fig. 8 one or more times:
Digital speedometer *
Tire pressure monitoring*
c::> page 239
Dri ver inform ation di spl ay 23
Trip computer c::>page24
Service interval disp lay c::> page 26
Speed warning c::> page 80
Gearshift selector positions c::> page 83
Automatic transmission
Adapt ive cru ise control*
c::> page 90
Lap timer c::> page 27
Eng ine oil temperature i ndica-c::> page 26
tor
Auto Check C ontrol
Some functions and vehicle components are
scanned for their operating stat us when yo u
switch the ignition on and whi le you are driv­
ing. Malfunc tions or required service proce­
dures a re signaled audib ly and indicated by
red and yellow i llumina ted symbols and re­
minders in the disp lay .
A WARNING ~
-Never re ly exclusively on the o utside
temperature display to determine if a
road surface is icy or not . Keep in mind
that road surfaces, espec ia lly br idges
and overpasses, could be ice covered and
slippery even at an outside tempe rature
above 41 ° F (+ S
0
() .
-Always remember, even if the "snow­
f lake" symbo l (ice warning) does not ap­
pea r in t he d isp lay, black ice co uld be on
t he road .
- Always reduce your speed and d rive with
special care in cold weathe r conditions
when t he ch ance of enco un tering icy
road surfaces inc reases .
(D Tips
If the vehicle is stationa ry, or if you a re
driv ing at a ve ry low speed, the temper a­
ture show n in the display might be s light ly
higher th an the actua l outs ide tempera ­
ture . This is caused by the heat being radi­
ated from the engine.

32 Opening and clo sing
keys. Unguarded access to the keys pro­
vides children the opportunity to start the engine and/or act ivate vehicle sys­
tems such as the power w indows etc . Un­
supervised operation of any veh icle sys­
tem by ch ildren can res ult in serious in­
Jury.
- Do not remove the key from the ignition
lock un til the vehicl e has come to a com­
plete stop. Otherwise the steering col­
um n lo ck could sud denly e ngage -caus ­
ing the risk of an accident.
@ Tips
- The operation of the remote cont ro l key
c a n be tempo rarily disru pted by in terfer­
ence from tran smi tters in t he v ici nity of
t h e veh icle work ing in the same frequen ­
cy ra nge (e.g . a ce ll phone, radio equip­
ment).
- Fo r security reasons, replacement keys
a re on ly availab le from author ized Audi
dealer.
- For Decla ration of Compliance to United
States FCC and Industry Canada regu la­
tions
c:> page 267.
Removing the mechanical k ey
F ig . 19 Remote ma ster key : remov ing the mec hanic al
key
" Press the release button ® c=>fig . 19.
"Pull the mecha nica l key @out of the maste r
key .
Using the mechan ica l key , you can :
- lock and unlock* the glove compartment on
the passenger's sid e ¢
page 66 . -
lock and unlock the vehicle manua lly
¢ page 35 if this should not be possible
w ith the master key.
- use the ignition key emergency release
¢ page 33.
Check light and battery in the master
key
•
Fig. 20 Remote mas ter key: r em ovin g th e bat te ry h old ­
er
Check light in the master key
The check light@¢ fig. 20 in the mas ter key
provides information abo ut different condi ­
t ions .
" The check light turns on b riefly once when a
bu tton is pressed , and during an " inquiry "
by the convenience key system .
" If the check light does not come on, the bat­
t ery is dead a nd has to be replaced. In addi­
t ion, when the batte ry is dead the
!I indi ­
ca tor ligh t a ppears in the instr ume nt clu ster
disp lay as well as the message
Plea se
change key battery .
Master key battery replacement
" Remove th e mechan ica l key r=o page 32.
" Press the re lease b utton @ r=o fig. 20on the
bat tery ho lder and at the same time pu ll the
battery ho lder o ut of the maste r key in the
d irection of the ar row.
" Insta ll the new battery CR 2032 with the
"+ " sign facing down.
" Push the battery holder carefully into the
master key.
" Insta ll the mechanical key .

174 Intelligent technology
Braking
What affects braking efficiency?
New brake pad s
Du ring the first 2 50 miles (400 k m), new
b ra ke pads do not possess their fu ll braking
effect , they have to be "broken in" first¢.&. .
The break-in period can be considerably lon­
ger for vehicles with ceramic brake rotors*.
You can compensate for this slightly reduced br aking power by push ing harder on the brake
pedal. Avoid heavy braking loads during the
b reak-in per iod.
Operating conditions and d riving h abits
The brakes on today's automobi les are st ill
subject to wear, depend ing largely on operat­
ing conditions and dr iv ing habits ¢.&. . On
vehicles that are e ithe r dr iven mostly in stop­
and-go city traffic o r are driven ha rd, the
b rake pads should be checked by you r aut hor­
iz ed A udi de aler more often than specified in
the
Warrant y & Maintenan ce booklet . Fail ure
to have your b ra ke pads inspected can resu lt
in red uced brake performance.
On steep slopes, yo u sh ou ld use t he b ra ki ng
effect of the eng ine. Th is w ay, you preven t un­
necessa ry wear on the brake system . If you
must use yo ur brakes, do not ho ld the brakes
down continuously. P ump the brakes at inter ­
va ls.
Operating noise
N oises may occur when braking depending on
the speed, braking fo rce and outside condi­
tions s uch as temperature a nd h umidity.
Due to the na ture of the mate rials used i n ce­
ramic brake rotors*, noises may become more
apparent at low speeds.
Effect of water and road salt
I n ce rtain situat ions, for exampl e after d riving
throug h wate r, in heavy ra in, after overn igh t
conde nsation or afte r washi ng your c ar, the
b ra ki ng effect can be reduced by moisture or
ice on the bra ke rotors and b rake pads. The brakes must be dr
ied first with a few careful
brake applications .
At highe r speeds and with the winds hield wip­
ers t urned on, the b ra ke pads press against
the b rake roto rs fo r a short amount o f time .
This occurs at regular intervals without the drive r not icing and p rov ides for better brake
response time under wet conditions.
The effectiveness of the brakes can be red uced
whe n the vehicle is driven on a sa lt -covered
road and the brakes are not used . Likewise,
you clean off accumulated salt coating from brake d iscs and pads with a few cautious ap­
plicat ions of the bra ke
¢ .&. .
D ue to the ir s urface characteristics, ceramic
brake rotors* absorb moisture in such condi­
tions . T his can cause a temporary reduction in
braking force compared to dry brakes . You can
compensate for th is by pressi ng the brake
p eda l harde r.
Corrosion
There may be a tende ncy for dirt to build up
on the brake pads and corros ion to form on
the d iscs if the car is not driven regu larly or
only for short trips w it h litt le use of the
brakes .
If the brakes are not used frequently, or if cor­
ros io n has formed on the discs, it is adv isable
to clean off the pads and discs by braking
firmly a few times from a moderately h igh
speed ¢.&. .
Faults in the brake system
If you shou ld notice a sudden increase in
brake pedal trave l, then one of the two brake
c ir cuits may have fa iled
c::> .&. .
Low brake fluid level
Malfunctions can occur in the brake system if
t h e brake fluid level is too low. The brake flu id
level is monitored electro nically .
Brake boo ster
The brake booster increases the pressure that
yo u generate with the brake peda l. It works
on ly when the engine is running
. ¢ .&. .,.