brake AUDI A4 2019 Workshop Manual

8W0012721BG
IntelligentTechnology

Thesystemdoesnotworkatspeedsbetweenap-
proximately19 and37mph(30and60km/h).
Thesystemistheninready-mode.Thisisindicat-
edbytheLEDinthe buttonturningon.Thesys-
temautomaticallyswitchedoffwhenyoudrive
fasterthan37mph(60km/h).TheLEDwillalso
turnoffinthisscenario.
Hilldescentassistisautomaticallyactivatedun-
derthefollowingconditions:
—theLEDinthebuttonturnson
—thevehiclespeedislowerthan19mph(30
km/h)
—thehillangleisatleastapproximately6%

ZAWARNING
—Bereadytoapply thebrakesatalltimes
whenusingthehillholdassist.
—Alwaysadjustthespeedto thevisibility,
weather,road,andtrafficconditions.The
systemcannotreplacethedriver'satten-
tion.
— Thesystemcannotmaintainaconstantvehi-
clespeedinallsituations,forexamplewhen
onsmoothorslipperyground.Thiscanin-
creasetheriskofanaccident.

Brakes
Newbrakepads
Newbrakepadsdonotachievetheirfullbraking
effectduringthefirst250mi(400km).They
mustbe“brokenin”first.However,youcancom-
pensatefortheslightlyreducedbrakingforceby
pressingfirmlyonthebrakepedal.Avoidheavy
brakingduringthebreak-inperiod.
Brakepadweardependslargelyonthewaythe
vehicleisdrivenandonoperatingconditions.
Brakepadwearincreaseswhendrivingfrequently
inthecityorshortdistancesorwhenusingavery
sportydrivingstyle.
Operatingnoise
Noisesmayoccurwhenbrakingdependingonthe
speed,
brakingforce,andoutsideconditionssuch
astemperatureandhumidity.
Wetconditionsorroadsalt
Incertainsituations,forexampleafterdriving
throughwater,inheavyrain,orafterwashing
yourcar,thebrakingeffectmaybereduceddue
tomoistureoriceonthebrakerotorsandbrake
pads.Thebrakesmustbe“dried”firstwithafew
carefulbrakeapplications.
Whendrivingathigherspeedswhilethewind-
shieldwipersareswitchedon,thebrakepadsare
brieflypressedagainstthebrakerotors.Thisac-
tion,whichisnotfeltbythedriver,happensat
regularintervalsandensuresabetterreaction
timeforthe brakesinwetweather.
Thebrakingeffectcanalsobereducedifyouare
drivingonsaltedroadsandyoudonot applythe
brakesforlongperiodsoftime.Thelayerofsalt
onthebrakerotorsandpadsmustbewornoff
firstwhenthebrakesareapplied.
Corrosion
Leavingthevehicleparkedforlongperiodsof
time,lowmileageonthevehicle,andavoiding
heavybrakingcancontributetocorrosiononthe
brakerotorsandtodirtybrakepads.
Ifyouusuallyavoidheavybrakingorifthereis
corrosionpresent,occasionalheavybrakingat
highspeedsisrecommendedtocleanthebrake
rotorsandpads>A\.
Brakesystemmalfunction
Ifyounoticethatthebrakepedalsuddenlygoes
downfarthertowardthefloorwhenyoupressit,
thenabrakecircuitinthedual-circuitbrakesys-
temmayhavemalfunctioned.Drivetoanauthor-
izedAudidealerorauthorizedAudiServiceFacili-
tyimmediatelytohavetheproblemcorrected.
Onthewaythere,drivewithreducedspeedand
keepinmindthatyouwillneedalongerdistance
tostopandyouwillneedtopressthebrake pedal
harder.
Lowbrakefluidlevel
Whenthebrakefluidlevelislow,malfunctionsin
thebrakesystemmayoccur.Thebrakefluidlevel
iselectronicallymonitored.
141

IntelligentTechnology

Brakebooster
Thebrakeboosteramplifiesthepressureyouap-
plytothebrakepedal.

ZAWARNING
—Onlyapplythebrakesforthepurposeof
cleaningthebrakesystemwhenroadand
trafficconditionspermit.Youmustnoten-
danger
otherroadusersandincreasethe
riskofanaccident.
—Duetotheriskofinjury,onlyhave anau-
thorizedAudidealerorauthorizedAudi
ServiceFacilityworkonthebrakesystem.
Incorrectrepairscouldimpair thefunction.
—Neverletthevehiclerollwhiletheengineis
stoppedbecausethisincreasestheriskofan
accident.

@)Note
—Neverletthe brakes“rub”bypressingthe
pedallightlywhenbrakingisnotactually
necessary.Thiscauses thebrakestoover-
heatandincreasesbrakingdistanceand
causeswear.
—Beforedrivingdownhillalongdistanceona
steephill,decreaseyourspeedandselecta
lowergear.Thismakesuseoftheengine
brakingeffectandreducestheloadplaced
onthebrakes.Ifyouneedtobrakeaddition-
ally,brakeinintervalsandnotcontinuously.
@Tips
—Ifthebrakeboosterisnotworking,you
mustpressthebrake pedalwithmuchmore
forcethannormal.
—Ifyouretrofityourvehiclewithafrontspoil-
er,wheelcoversorsimilaritems,makesure
thattheairflowtothefrontwheelsisnot
obstructed.Otherwisethebrakesystemcan
overheat.
142
Electromechanical
steering,Dynamic
steering
Theelectromechanicalsteeringsupportsthe
driver'ssteeringmovements.
Powersteeringadaptselectronicallybasedon
thevehiclespeed.
Indicatorlightsandmessages
aSteering:malfunction!Pleasestopvehicle
Ifthisindicatorlightturnsonandstaysonand
thismessageappears,thepowersteeringmay
havefailed.
Stopthevehicleinasafelocationassoonaspos-
sible.Donotcontinuedriving.Seeanauthorized
AudidealerorauthorizedAudiServiceFacilityfor
assistance.
aSteering:malfunction!Youcancontinue
driving
Iftheindicatorlightturnsonandthismessage
appears,thesteeringwheelmaybemoredifficult
tomoveormoresensitivethanusual.Thesteer-
ingwheelmayalsobeturnedtothesidewhen
drivingstraight.
DriveslowlytoanauthorizedAudidealerorau-
thorizedAudiServiceFacilitytohavethe mal-
functioncorrected.
Dynamicsteering:correctingsteeringwheel
position
Iftheindicatorlightturnsonandthismessage
appears,thedynamicsteering”isreinitializing.
Thesteeringwheelwillbeeasytomoveafter
startingtheengine.Reinitializationmightbe
necessaryifthesteeringwheelwasmovedwhile
theenginewasswitchedoff.Thedisplayturnsoff
iftheinitializationwassuccessful.
(i)Tips
—Iftheaorlindicatorlightonlystayson
forashorttime,youmaycontinuedriving.
— Thedynamicsteeringstabilitysystems
=>page138arenotavailableintheeventof
asystemmalfunction.

IntelligentTechnology

—Howvarioussystemsinyourvehiclewereoper-
ating;
—Whetherornotthedriverandpassengersafety
beltswerebuckled/fastened;
—Howfar(ifatall)thedriverwasdepressingthe
acceleratorand/orbrakepedal;and,
—Howfastthevehiclewastraveling.
Thesedatacanhelpprovideabetterunderstand-
ingofthecircumstancesinwhichcrashesandin-
juriesoccur.NOTE:EDRdataarerecordedby your
vehicleonlyifanon-trivialcrashsituationoccurs;
nodataarerecordedbytheEDRundernormal
drivingconditionsandnopersonaldata(e.g.,
name,gender,age,andcrashlocation)arere-
corded.However,otherparties,suchaslawen-
forcement,couldcombinetheEDRdatawiththe
typeofpersonallyidentifyingdataroutinelyac-
quiredduringacrashinvestigation.
Toreaddata recordedby anEDR,specialequip-
mentisrequired,andaccesstothevehicleorthe
EDRisneeded.Inadditiontothevehiclemanu-
facturer,otherparties,suchaslawenforcement,
thathavethespecialequipment,canreadthein-
formationifthey haveaccesstothevehicleorthe
EDR.
Somestatelawsrestricttheretrievalordown-
loadingofdatastoredbyEDRsinstalledinavehi-
clefortheexpresspurposeofretrievingdataaf-
teranaccidentorcrasheventwithouttheown-
er'sconsent.
AudiwillnotaccesstheEDRand/orsimilardata
orgiveittoothers-
—unlessthevehicleowner(orlesseeifthevehi-
clehasbeenleased)agrees; or
—upontheofficialrequestbythepolice;or
—upontheorderofacourtoflaworagovern-
mentagency;or
—forthedefenseofalawsuitthroughthejudicial
discoveryprocess.
—Audimayalsousethedataforresearchabout
vehicleoperationandsafetyperformanceor
providethedatatoathirdpartyforresearch
purposeswithoutidentifyingthespecificvehi-
cleorinformationabouttheidentityofitsown-
er orlesseeandonlyaftertherecordedvehicle
datahasbeenaccessed.
144
Vehiclecontrolmodules
Yourvehicleisalsoequippedwithanumberof
electroniccontrolmodulesforvariousvehicle
systems,suchasenginemanagement,emission
control,airbags,andsafetybelts.
Theseelectroniccontrolmodulesrecorddata
duringnormalvehicleoperationthatmaybe
neededbytrainedtechniciansfordiagnosticand
repairpurposes.Therecordingcapabilityofthese
modulesislimitedtodata(nosoundisrecorded).
Onlyasmallamountofdataisactuallyrecorded
overaverylimitedperiodoftime,orstoredwhen
asystemfaultisdetectedbyacontrolmodule.
Someofthedatastoredmayrelatetovehicle
speed,direction,orbraking,aswellasrestraint
systemuseandperformanceintheeventofa
crash.Storeddatacanalsoonlybereadand
downloadedwithspecialequipmentthatisdi-
rectlyconnectedtothevehicle.
G)Tips
YourvehiclemaybeequippedwithAudicon-
nect.YouruseofcertainAudiconnectfea-
turesrequireswirelessservicesthatarepro-
videdbyathirdpartywirelesstelecommuni-
cationsprovider.Fordetailsregardinghowin-
formationobtainedthroughAudiconnectis
collected,processed,transmitted,used,and
shared,pleaseseeyourcontractwiththe
wirelesstelecommunicationsprovider.

Drivingsafety

Pedalarea
Thepedalsmustalwaysbefreetomoveand
mustneverbeinterferedwithby afloormator
anyotherobject.
Makesurethatallpedalsmovefreelywithoutin-
terferenceandthatnothingpreventsthemfrom
returningtotheiroriginalpositions.
Only usefloormatsthatleavethepedalareafree
andcan besecuredwithfloormatfasteners.
If abrakecircuitfails,increasedbrakepedaltrav-
elisrequiredto bringthevehicletoafullstop.

Z\WARNING
Pedalsthatcannotmovefreelycancauseloss
ofvehiclecontrolandincreasetheriskofseri-
ousinjury.
—Neverplaceanyobjectsinthedriver'sfoot-
well.Anobjectcouldgetintothepedalarea
andinterferewithpedalfunction.Incaseof
suddenbrakingoranaccident,youwould
not beabletobrakeoraccelerate!
—Alwaysmakesurethatnothingcan fallor
moveintothedriver'sfootwell.
1aColeyurlMeleMealy-eed(el
Alwaysusefloormatsthatcanbesecurelyat-
tachedtothefloormatfastenersanddonotin-
terferewiththefreemovementofthepedals.

>Makesurethatthefloormatsareproperlyse-
curedand cannotmoveandinterferewiththe
pedals>/A\.
Useonlyfloormatsthatleavethepedalareaun-
obstructedandthatarefirmlysecuredsothat
theycannotslipoutofposition.Youcanobtain
suitablefloormatsfromyourauthorizedAudi
dealer.
FloormatfastenersareinstalledinyourAudi.
Floormatsusedinyourvehiclemustbeattached
tothesefasteners.Properlysecuringthefloor
matswillpreventthemfromslidingintoposi-
252
tionsthatcouldinterferewiththe pedalsorim-
pairsafeoperationofyourvehicleinotherways.

Z\WARNING
Pedalsthatcannotmovefreelycanresultina
lossofvehiclecontrolandincreasetheriskof
seriouspersonalinjury.
—Alwaysmakesurethatfloormatsareprop-
erlysecured.
—Neverplaceorinstallfloormatsorother
floorcoveringsinthevehiclethatcannotbe
properlysecuredinplace topreventthem
fromslippingandinterferingwiththeped-
alsortheabilitytocontrolthevehicle.
—Neverplaceorinstallfloormatsorother
floorcoveringsontopofalreadyinstalled
floormats.Additionalfloormatsandother
coveringswillreducethesizeofthe pedal
areaandinterferewiththepedals.
—Alwaysproperlyreinstallandsecurefloor
matsthathavebeentakenoutfor cleaning.
—Alwaysmakesurethatobjectscannotfallin-
tothedriverfootwellwhilethevehicleis
moving.Objectscanbecometrappedunder
thebrakepedalandacceleratorpedalcaus-

ing a lossofvehiclecontrol.

8W0012721BG
CheckingandFilling

OnBoardDiagnosticSystem
EnginedatacanbereadoutattheOnBoardDi-
agnosticSystemconnectionportusingaspecial
testingdevice>fig.253.
Indicatorlight
IftheSindicatorlightblinksorturnson,there
isamalfunctionthatiscausingpooremissions
qualityandthatcoulddamagethecatalyticcon-
verter.DriveslowlytoanauthorizedAudidealer
orauthorizedAudiServiceFacilitytohave the
malfunction
corrected.
Theindicatorlightcanalsoturnonifthefuelfill-
ercapisnotclosedcorrectly>page306).

Z\WARNING
Incorrectuseofthe connectionportforthe
OnBoardDiagnosticSystemcancausemal-
functions,whichcanthenresultinaccidents
andseriousinjuries.
—OnlyallowanauthorizedAudidealerorau-
thorizedAudiServiceFacilitytoreadout the
enginedata.

Enginecompartment
MelatimimsaCeMtalemeen)Seen1n
Specialcareisrequiredifyouareworkinginthe
enginecompartment
Forworkintheenginecompartment,suchas
checkingandfillingfluids,thereisariskofin-
jury,scalding,accidents,andburns.Forthis
reason,followallthewarningsandgeneral
safetyprecautionsprovidedinthe followingin-
formation.Theenginecompartmentisadan-
gerousarea.>/\.

Z\WARNING
—Turntheengineoff.
—Switchtheignitionoff.
—Settheparkingbrake.
—Onvehicleswithamanualtransmission,
movethegearshiftlevertoneutral,andon


)Dependingontheengine


vehicleswithanautomatictransmission,se-
lectthe“P”(Park)position.
—Allowtheenginetocool.
—Keepchildrenawayfromtheenginecom-
partment.
—Neverspillfluidsonahotengine.Theseflu-
ids(suchastheanti-freezingagentcon-
tainedinthecoolant)canignite.
—Avoidshortcircuitsintheelectricalsystem.
—Neverreachintotheradiatorfan.Thefanis
temperature-controlledandcanturnon
suddenly,evenwhentheignitionisswitched
off.
—Neveropenthehoodwhenthereissteamor
coolantescapingfromtheenginecompart-
ment,becausethereisariskthatyoucould
beburned.Waituntilnosteamorcoolantis
escaping.
—Neveropenthecaponthecoolantexpan-
siontankwhentheengineiswarm.The
coolingsystemisunderpressure.
—Toprotectyourface,hands,andarmsfrom
hotsteamorcoolant,coverthecapwitha
thick clothwhenopening.
—Donotremovetheenginecoverunderany
circumstances.Thisincreasestheriskof
burns.
—Duetotheriskofelectricshock,nevertouch
theignitioncableorothercomponentsin
theelectronichigh-voltageignitionsystem
whentheengineisrunningorisstarting.
—Ifagearisengagedwhilethevehicleissta-
tionaryandtheengineisrunning,donot
presstheacceleratorpedalinadvertently.
Pressingtheacceleratorpedalwillcausethe
vehicletomove,andthiscouldresultinan
accident.
—Ifinspectionsorrepairsmustbeperformed
whiletheengineisrunning,movingcompo-
nents(suchastheribbedbelt,generator,
and
radiatorfan)poseanadditionalrisk.
—Firstsettheparkingbrake,andthenmove
thegearshiftlevertoneutralonvehicles
withamanualtransmissionorselectthe

309

CheckingandFilling

@®Engineoillabel*withVWstandard
=>page312
©Coolantexpansiontank(-£)>page316
©Brakefluidreservoir(C))>page317
Thecoolantexpansiontankandtheengineoil
fillingopeningmaybelocatedindifferentplaces
within
theenginecompartment,dependingon
theengineversion.
Engineoil
Iftheengineoillevelistoolow
Ifyouneedtoaddengineoil,useanoilthatis
listedonthesticker.Thestickerislocatedatthe
frontoftheenginecompartment>page311,
fig.256.
Iftherecommendedengineoilisnotavailable,in
anemergencyyoumayaddamaximumof1
quart(1liter)ofACEAC3orAPISNengineoil
onetimeuntilthenextoilchange.
Formoreinformationonthecorrectengineoil
foryourvehicle,contactanauthorizedAudideal-
erorauthorizedAudiServiceFacility.Havetheoil
changedbyanauthorizedAudidealerorauthor-
izedServiceFacility.

Audirecommends
Slastiol(ZIDIBIEProrzssional
AudirecommendsusingtheLongLifehigh-per-
formanceengineoilfromAudiGenuineParts.
Messages
Engineoilpressure


&Turnoffengine.Oilpressuretoolow
Stopdrivingandswitchtheengineoff.Checkthe
engineoillevel>page313.
—Iftheengineoillevelistoolow,addengineoil
=>page314.Onlycontinuedrivingoncethein-
dicatorlightturnsoff.
—Iftheengineoilleveliscorrectandtheindica-
torlightstillturnson,turntheengineoffand
do
notcontinuedriving.SeeanauthorizedAudi
dealerorauthorizedAudiServiceFacilityforas-
sistance.
312
Engineoillevel
Applies
to:vehicleswithoillevelwarning
BPleaseaddoilimmediately.
Stoptheengineanddonotcontinuedriving.
Checktheengineoillevel>page313and add
engineoilimmediately>page314.
2Pleaseaddmax.xqt(xl)oil.Youcancon-
tinuedriving
Addtheamountof oil shownimmediately
>page314.
Reducingtheoillevel
3Pleasereduceoillevel.
Thereistoomuchoilintheengineandthereisa
risk
ofdamagingthecatalyticconverteroren-
gine.DrivetoanauthorizedAudidealerorau-
thorizedAudiServiceFacilityimmediatelytohave
engineoilextractedifnecessary.Avoidhighen-
ginespeeds,fullacceleration,andheavyengine
loads.
Engineoilsensor
&Oillevelsensor:oilchangenecessary.Please
contactService
Fuelhasenteredtheengineoil.Thiswillcause
theengineoilleveltoriseslowlyandtheengine
oilqualitytodecrease.Donotextractengineoil
toreducethelevel,becausethiswillincreasethe
riskofenginedamage.DrivetoanauthorizedAu-
didealerorauthorizedAudiServiceFacilityim-
mediatelytohaveengineoilextracted.
&Oillevelsystem:malfunction!Pleasecon-
tactService
Thesensorthatcheckstheengineoillevelhas
malfunctioned.DrivetoanauthorizedAudideal-
erorauthorizedAudiServiceFacilityimmediately
tohavethemalfunctioncorrected.
2Oilpressuresensor:malfunction!Please
contactService
Thesensorthatcheckstheengineoilpressure
hasmalfunctioned.DrivetoanauthorizedAudi
dealerorauthorizedAudiServiceFacilityimmedi-
atelytohavethemalfunctioncorrected.

8W0012721BG
CheckingandFilling

Brakefluid
B8K-2122



Fig.259Enginecompartment:caponbrakefluidreservoir
Observethesafetyprecautions>A\inWorking
intheenginecompartmentonpage309.
Checkingthebrakefluidlevel
>Readthebrakefluidlevelonthebrakefluidres-
ervoir>page311,fig.256.Thebrakefluidlev-
elmustbebetweentheMINandMAXmarkings
>A.
Thebrakefluidlevelismonitoredautomatically.
Changingthebrakefluid
Brakefluidshouldbechangedatregularinter-
vals.Havethebrakefluidchangedby anauthor-
izedAudidealerorauthorizedAudiServiceFacili-
ty.TheauthorizedAudidealerorauthorizedAudi
ServiceFacilitywillinformyouofthereplace-
mentintervals.

ZAWARNING
—IfthebrakefluidlevelisbelowtheMIN
marking,itcanimpair thebrakingeffectand
drivingsafety,whichincreasetheriskofan
accident.Donotcontinuedriving.Seeanau-
thorizedAudidealerorauthorizedAudi
ServiceFacilityforassistance.
—Ifthebrakefluidisold,bubblesmayformin
thebrakesystemduringheavybraking.This
couldimpairbrakingperformanceanddriv-
ingsafety,whichincreasestheriskofanac-
cident.
— Thebrakefluidinyourvehiclemustmeet
thestandardVW50114andisavailableat
anauthorizedAudidealerorauthorizedAu-
diServiceFacility.Ifthisbrakefluidisnot
available,anotherhigh-gradebrakefluidof


equivalentqualitymaybeused,anditmust
meettheU.S.FederalMotorVehicleStand-
ard(FMVSS)116DOT4,Class6.
Q)Note
—IfthebrakefluidlevelisabovetheMAX
marking,brakefluidmayleakoutoverthe
edgeofthereservoirandresultindamage
tothevehicle.
—Donotallowanybrakefluidto comeinto
contactwiththevehiclepaint,becauseit
willcorrodethepaint.

Electricalsystem
Ifthe=orflindicatorlightturnson,thereisa
malfunctioninthegenerator,thebattery, orthe
vehicleelectricalsystem.
=Electricalsystem:malfunction!Safelystop
vehicle
Donotcontinuedrivingandswitchtheengineoff
=>AX.SeeanauthorizedAudidealerorauthorized
AudiServiceFacilityforassistance.
[HlElectricalsystem:malfunction!Restartnot
possible.PleasecontactService
Itwillnot bepossibletorestarttheengineonce
youturnitoff.Vehiclefunctions/drivingstability
maybelimited.DrivetoanauthorizedAudideal-
erorauthorizedAudiServiceFacilityimmediate-
ly.
z=Electricalsystem:malfunction!Pleasecon-
tactService
Switchoffallelectricalequipmentthatisnot
needed.Vehiclefunctions/drivingstabilitymay
belimited.DrivetoanauthorizedAudidealeror
authorizedAudiServiceFacilityimmediately.
z=Electricalsystem:lowbatterycharge.Bat-
tery
willbechargedwhiledriving
Thestartingabilitymaybeimpaired.
Ifthismessageturnsoffafteralittlewhile,the
vehiclebatteryhaschargedenoughwhiledriving.>
317

8W0012721BG
Wheels

Glossaryoftireandloading
terminology
Accessoryweight
meansthecombinedweight(in
excessofthosestandarditems
whichmaybereplaced)ofauto-
matictransmission,powersteer-
ing,powerbrakes,powerwin-
dows,powerseats,radio,and
heater,totheextentthatthese
itemsareavailableasfactory-in-
stalledequipment(whetherin-
stalledornot).
Aspectratio
meanstheratioofthe heightto
thewidthofthetireinpercent.
Numbersof55orlowerindicatea
lowsidewallforimprovedsteer-
ingresponseandbetteroverall
handlingondrypavement.
Bead
meansthepartofthetirethatis
madeofsteelwires,wrappedor
reinforcedbyplycordsandthatis
shapedtofittherim.
Beadseparation
meansabreakdownofthebond
betweencomponentsinthebead.
Cord
meansthestrandsformingthe
pliesinthetire.
Coldtireinflationpressure
meansthetirepressurerecom-
mendedbythevehiclemanufac-
turerforatireofadesignated
sizethathasnotbeendrivenfor
morethanacoupleofmiles(kilo-
meters)atlowspeedsinthethree
hourperiodbeforethetirepres-
sureismeasuredoradjusted.
Curbweight
meanstheweightofamotorve-
hiclewithstandardequipmentin-
cludingthemaximumcapacityof
fuel,oil,andcoolant,aircondi-
tioningandadditionalweightof
optionalequipment.
Extraloadtire
meansatiredesignedtooperate
athigherloadsandathigherin-
flationpressuresthanthecorre-
spondingstandardtire.Extraload
tiresmaybeidentifiedas“XL”,
“xL’,“EXTRALOAD”,or“RF”on
thesidewall.
325

8W0012721BG
Wheels

Productionoptionsweight
meansthecombinedweightof
thoseinstalledregularproduction
optionsweighingover5lbs.
(2.3kg)inexcessofthosestand-
arditemswhichtheyreplace,not
previouslyconsideredincurb
weightoraccessoryweight,in-
cludingheavy dutybrakes,ride
levelers,roofrack,heavyduty
battery,andspecialtrim.
Radialplytire
meansapneumatictireinwhich
theplycordsthatextendtothe
beadsarelaidatsubstantially
90degreestothecenterlineof
thetread.
Recommendedinflation
pressure
see>page325,Coldtireinfla-
tionpressure.
Reinforcedtire
meansatiredesignedtooperate
athigherloadsandathigherin-
flationpressuresthanthecorre-
spondingstandardtire.Rein-
forcedtiresmaybeidentifiedas
“XL”,“xl”,“EXTRALOAD”,or“RF”
onthesidewall.
Rim
meansametalsupportforatire
oratireandtubeassemblyupon
whichthetirebeadsareseated.
Rimdiameter
meansnominaldiameterofthe
beadseat.Ifyouchangeyour
wheelsize,youwillhavetopur-
chasenewtirestomatchthenew
rimdiameter.
Rimsizedesignation
meansrimdiameterandwidth.
Rimwidth
meansnominaldistancebetween
rimflanges.
Sidewall
meansthatportionofatirebe-
tweenthetreadandbead.
Speedrating(lettercode)
meansthespeedatwhichatireis
designedtobedrivenforextend-
edperiodsoftime.Theratings
rangefrom93mph(150km/h)
to186mph(298km/h)>table
onpage323.Youmaynotfind
thisinformationonalltiresbe-
causeitisnotrequiredbylaw.
Thespeedratinglettercode,
whereapplicable,ismoldedon
thetiresidewallandindicatesthe>
327

8W0012721BG

Wheels



—Onlyusetiresthataremore—Inflationpressurethatistoolow
thansixyearsoldwhenabso-orhighcanincreasetirewear
lutelynecessaryanddriveconsiderably.
carefullywhendoingso.—Drivingquicklythroughcurves,
—Donotuserun-flattiresonrapidacceleration,andheavy
yourvehicle.Usingthemwhenbrakingincreasetirewear.
notpermittedcanleadtove-—HaveanauthorizedAudidealer
hicledamageoraccidents.orauthorizedAudiServiceFacili-
—Ifyouinstallwheelcoversontycheckthewheelalignmentif
thevehicle,makesuretheyal-thereisunusualwear.
lowenoughaircirculationto—Havethewheelsrebalancedifan
coolthebrakesystem.Iftheyimbalanceiscausingnoticeable
donot,thiscouldincreasethevibrationinthesteeringwheel.
riskofanaccident.Ifyoudonot,thetiresandother
vehiclecomponentscouldwear
Tirewearanddamagemorequickly.

Treadwearindicator
Originalequipmenttirescontain
treadwearindicatorsinthetread
pattern,whicharebarsthatare
1/16in(1.6mm)highandare
spacedevenlyaroundthetireper-
Fig.263Tireprofile:creaniweneacependiculartotherunningdirec-
tortion>fig.263.Theletters“TWI”
Tirewearortrianglesonthetiresidewall
indicatethelocationofthetread-
Checkthetiresregularlyforwear.wearindicators.
Thetireshavereachedthemini-
mumtreaddepth!)whenthey>

DObeyanyapplicableregulationsinthe
country
wherethevehicleisbeingoper-
ated.
331