brakes PORSCHE 911 CARRERA 2003 4.G Owners Manual

Beforedrivingoff12,13
Breakinhints14
Keys,theftprotection.16-19
Immobilizer,securitywheelbolts17
Doors,doorwindows20
Centrallocking21-23
Alarmsystem,infraredpassenger
compartmentmonitoring24,25
Powerwindows26,27
Mirrors,insideanddoor28,29
Rearwindowdefogger30
Sunvisors31
Seats32-37
Steeringwheeladjustment37
Safetybelts38-40
Childrestraintsystems41-43
Airbagsystem44,45
Rolloverprotectionsystem46,47
Parkingaids48,49
Retractablerearspoiler50,51
Fixedrearspoiler,frontspoiler,
sidememberparts51
Clutch,parkingbrake,brakes52-55
ABSbrakesystem56,57
PSMPorschestabilitymanagement58,59
Four-wheeldrive60,61
Dashboard,controlsandinstruments...62-109
Controls,Instruments
Ignition/starterswitch64,65
Startingandstoppingtheengine66,67
Instrumentpanel68-97
On-boardcomputer82-97
Emergencyflasherswitch99
Lightswitch,
automaticheadlightbeamadjustment100
Turnsignals/
headlightdimmer/flasherlever101
Windshieldwiper/washerlever,
rainsensor102,103
Automaticspeedcontrol104,105
Automaticairconditioner106-108
Centralandsidevents109
Ashtray11
°
Cigarettelighter,rearwiper111
Interiorlights112-114
Cupholder115
Storageinthepassengercompartment,
CDorcassetteholder116,117
Frontandrearlids118,119
Luggagecompartment120,121
Trunkentrapment122,123
Sportsexhaustsystem123
PCMPorschecommunicationmanagement.123
Caraudiooperation,tips124,125
Cartelephoneandaftermarkedalarms126
Controls,Instruments
11

Limitsofultrasonicmeasurement
Theparkingassistantsystemcannotdetect:
-sound-absorbingobstacles(e.g.powder
snow),
-sound-reflectingobstacles(e.g.glasssur-
faces,flatpaintedsurfaces)
-andverythinobstacles.
Otherultrasoundsources(e.g.pneumatic
brakesofothervehicles,jackhammers)can
interferewithdetectionofobstacles.
Faultindication
Theparkingassistantsystemindicatesafaultin
twoways:
-Afterreversegearhasbeenselected,the
shortsignaltoneisfollowedbyacontinuous
toneofthe
same
pitch:
Thisindicatesthatsensorsaresoiledor
coveredwithice.
-Afterreversegearhasbeenselected,the
shortsignaltoneisfollowedbyacontinuous
tonewithamuchlowerpitch:
Thisindicatesageneralsystemfault.Please
havethefaultremediedatanauthorized
Porschedealer.
A-Controlswitchfordoormirroradjustment
Swivellingdownmirrorglassonthe
passenger'sside
Onvehicleswithseatmemoryyoucanactivate
anadditionalparkingaid.
Activatingsee"SeatMemory".
-Whenreversegearisengaged,themirror
glassonthepassenger'ssideswivelsdown
slightlytoshowthecurbarea.
-Themirrorglassreturnstoitsinitialposition
whenthecarisshiftedoutofreversegear.
c-..aMovingmirror
glass
toitsinitialposition
withreversegearengaged
t>BrieflymovecontrolswitchAinanydirection.
Controls,Instruments
49

.
@
ParkingbrakewarninglightUSA
Parkingbrakewarninglight
Canada
Thewarninglightswillgooutaftertheparking
brakeisfullyreleased.
Thewarninglightsarenotanindicatorthatthe
parkingbrakeisfullyset;itisonlyintendedto
beawarningtoreleasetheparkingbrakebe-
foredrivingthecar.
ACaution!
Apartiallyengagedbrakewilloverheatthe
rearbrakes,reducetheireffectivenessand
causeexcessivewear.
[>
Releasetheparkingbrakefully.
[>
Whenparkingyourcar,alwayssettheparking
brakebypullingallthewayuponthelever.
[>
Movetheselectorleverto"P"(Tiptronic)or
movethegearshiftlevertoreverseorfirst
gear(Manualtransmission).
[>
Onhillsalsoturnthefrontwheelstowardsthe
curb.
Brakes
[>Makeitahabittochecktheoperationofyour
brakesbeforedriving.
Keepinmindthatthebrakingdistanceincreases
veryrapidlyasthespeedincreases.At60mph
or100km/h,forexample,itisnottwicebut
fourtimeslongerthan30mphor50km/h.Tire
tractionisalsolesseffectivewhentheroadsare
wetorslippery.
[>Therefore,alwaysmaintainasafedistance
fromthecarinfrontofyou.
Note
Eventhoughthebrakediscsconsistofalloyed
greycastiron,theywillunavoidablystarttocor-
rodeifyourcarisparkedforanextended
period.Thebrakeswilltendto"rub"asthere-
sult.
Thenature,extentandeffectsofcorrosionde-
pendontheamountoftimethevehiclewas
parked,whethergranularorliquidroadsaltwas
spreadandwhethergrease-dissolvingagents
wereusedincarwashes.
Ifthebrakingcomfortisnoticeablyimpaired,we
recommendhavingthebrakesystemchecked
byexpertsatanauthorizedPorschedealer.
Brakesystemfunction
YourPorscheisequippedwithapowerassisted
hydraulicdualcircuitbrakesystemwithdisc
brakesatthefrontandrear.
Bothcircuitsfunctionindependently.Onebrake
circuitoperatesthefrontandtheotheroperates
therear.
Ifonebrakecircuithasfailed,theotherwillstill
operate.However,youwillnoticeanincreased
pedaltravelwhenyouapplythebrakes.
Failureofonebrakecircuitwillcausethestop-
pingdistancetoincrease.
A
Warning!
Riskofanaccident.
Intheunlikelyeventofhydraulicfailureof
onebrakecircuit:
[>
Pushthebrakepedaldownfirmlyandholdit
inthatposition.
Amechanicallinkageactivatesthesecondcir-
cuit,andyouwillbeabletobringthevehicle
toastop.
[>
Afterbringingyourvehicletoacomplete
stop,avoiddrivingthevehicleandinstead
haveittowedtothenearestauthorized
Porschedealerforrepair.
[>[>[>
Controls,Instruments
53

41CD
BrakewarninglightUSA
@BrakewarninglightCanada
Ifthewarninglightsintheinstrumentpaneland
on-boardcomputergoonwhiledriving,the
brakefluidlevelmaybetoolow,or(ifthebrake
pedaltravelhasincreased)oneofthetwobrake
circuitsmayhavefailed.
Agreaterbrakingpressurewillberequired,
stoppingdistanceswillbelongerandthebrak-
ingbehaviorwillchange,particularlyincurves.
Withcorrectlyadjustedbrakes,andacorrectly
workingbrakesystem,thepedaltraveltothe
pointofbrakeactuationshouldbe
1-3/16
in.to

1-9/16
in.or30to40mm.
Wheneverthebrakepedaltravelexceedsthis
distance,havethebrakesystemchecked.
54Controls,Instruments
Brakepedal
/!\Warning!
Riskofanaccident.
Anyobstructionofthebrakepedalcould
increasethestoppingdistance.
I>Alwayscheckthemovementofthebrake
pedalbeforedrivingandmakesurethatitis
notobstructedbyafloormatoranyother
object.
I>Securethefloormattopreventitfromsliding
intopositionsthatcouldinterferewiththe
safeoperationofyourvehicle.
YourPorschedealerwillbegladtoofferyou
floormatsofthecorrectsizeincludingase-
curingpossibility.
Note
Incaseoneofthetwobrakecircuitsfails,in-
creasedpedaltravelisrequiredtobringyour
vehicletoafullstop.
/!\Warning!
Toavoidoverheatingandprematurewear
ofthebrakes:
I>Beforedescendingasteepgrade,reduce
speedandshiftthetransmissionintoalower
gearordrivingpositiontocontrolspeed.
I>Donot"ridethebrakes"byrestingyourfoot
onthepedalwhennotintendingtoapply
brakepressure.
I>Donotholdthepedaldowntoolongortoo
often.
Thiscouldcausethebrakestogethotand
notfunctionproperly.

Brake
booster
Thebrakeboosterassistsbraking
only

whentheengineisrunning.

Whenthecarismovingwhiletheengineisnot
running,orifthebrakeboosterisdefective,
morepressureonthebrakepedalisrequiredto
bringthecartoastop.
Moistureorroadsaltonbrakesaffectsbraking.
Whenthevehicleisdrivenonsaltedroadsfor
extendedperiods,thebrakesshouldbewashed
downthoroughlyaboutevery2weeks.Anauto-
maticcarwashfacilitycannotdothisjob
properly.
Brakeswilldryafterafewcautiousbrakeappli-
cations.

A.Warning!
Drivingthroughwatermayreducethetrac-
tion.
Moistureonbrakesfromroadwater,car
wash,orcoatingofroadsaltmayaffect
brakingefficiency.
t>Cautiously
applybrakes
to
testbrakesafter
beingexposed.
Brakewear
Yourcarhasexcellentbrakes,buttheyarestill
subjecttowear.Therateatwhichtheywear
dependsonhowthebrakesareused.

t>
Havethebrakesysteminspectedattheinter-
valsrecommendedinyourMaintenance
Booklet.

8
@
WarninglightUSA
WarninglightCanada

Ifthelightsintheinstrumentpanelandon-board
computerstayonwhentheengineisrunningor
comeonwhiledriving,thebrakepadsareworn,
excessively.
t>Donotcontinuetooperatethevehicle.
HaveyourauthorizedPorschedealerinspect
orreplacethebrakepads.
Brakepads
Wearonthebrakepadsandbrakediscs
dependstoagreatextentonthedrivingstyle
andtheconditionsofuseandthereforecannot
beexpressedinactualmilesontheroad.
Thehigh-performancebrakesystemisdesigned
foroptimalbrakingeffectatallspeedsandtem-
peratures.
Certainspeeds,brakingforcesandambient
conditions(suchastemperatureandhumidity)
thereforemightcausethebrakestosqueal.

Newbrakepadsorlinings

Newbrakepadshavetobe"brokenin",and
thereforeonlyattainoptimalfrictionwhenthe
carhascoveredseveralhundredmilesorkm.
Theslightlyreducedbrakingabilitymustbe
compensatedforbypressingthebrakepedal
harder.Thisalsoapplieswheneverthebrake
padsandbrakediscsarereplaced.
Controls,Instruments
55

ABSBrakeSystem
(AntilockBrakeSystem)
TheABSsystemrepresentsamajorcontribution
totheenhancementofactivesafetyinyourve-
hicle.
Thissystempreventsthewheelsfrom
lockinginapanicstoponalmostallroadsur-
faces.
56
Controls,Instruments

With
theABSsystem
inyour
vehicle,the

following
areasareenhanced:
Steering,vehicleremainssteerable
underall
brakingforceswhenABSisengaged.
Good
directionalcontrol,
noswervingcaused
bylockingofwheelsunderbrakingconditions.
Shorterstopping
distance,
stoppingdistances
areusuallyreducedbecausecontrolledbraking
ismaximized.
Preventionofwheellockup,nobrake-
inducedslidingandthusnolocalizedtirewear
fromemergencybraking.
ThecrucialadvantageoftheABSsystemovera
conventionalbrakesystemisintheareaof
maintainingdirectionalcontrolandmaneuvera-
bilityofthecarinemergencysituationsduring
normaldriving,includingpanicbrakinginturns.

A.Warning!
Theincreasedcontrolthatisprovided
shouldnotinduceyoutotakegreaterrisks
withyoursafety.Thelimitsdictatedbythe
lawsofphysicscannotbeovercome,even
withABS.
Theriskofaccidentsduetoinappropriate
speedcannotbereduced,evenbytheABS.
Thedriverbearstheresponsibilityforall
drivingmaneuvers.
[>
Adaptyourdrivingstyletotheprevailingroad
andweatherconditions.
[>Obeyalltrafficlaws.

OthervehiclesnotequippedwiththeABS
systemmaynotbeabletomaintaincon-
trol,especiallyonwetorpoorroadsur-
facesandthusmaybemorelikelytoim-
pactyoufrombehind.

[>
Tominimizethatrisk,useyourABSsystem
toincreaseyourabilitytomaneuvertoavoid
dangeroussituationsandnotmerelytotryto
stopintheshortestdistancepossible.

OperationoftheABSsystem
Awheelspeedsensorismountedtoeachofthe
fourwheels.Ifwheellock-upofeitherofthe
frontwheelsortherearwheelsissensedduring
braking,thebrakepressureisadjustedautomat-
icallyuntilthewheelnolongerslips.Thebrake
pressureisregulatedforeachfrontwheelindi-
viduallyandforbothoftherearwheels
together.
Onaroadsurfacewhichisslipperyononlyone
side,therearwheelwhichisbrakingontheslip-
perysurfacedeterminesthebrakepressure
whichwillbeappliedequallytobothrearwheels.
Thisensuresthatdirectionalstabilityismain-
tained.However,ifbrakingforcesapproachthe
wheellock-uppointforallwheels(panicbraking)
theABSsystemwillintervenetoprovidearapid
rythmicbraking.
TheproperoperationofABSisperceivedbythe
driverasapulsatingbrakepedalinconjunction
withaudiblenoiseandperhapssomevibration.
I>Ifyouexperiencethesesensationswhiledriv-
ingoraroadsurfacewithquestionabletrac-
tion,reducevehiclespeedappropriateforthe
prevailingroadconditions.
Thefunctionalreadinessofallthemainelectrical
componentsoftheABSischeckedbyanelec-
tronicmonitoringsystembothbeforeandwhile
youdrive.

8
WarninglightUSA
@
WarninglightCanada

WhentheignitionisswitchedontheABSwarn-
inglightwilllightupwhilethesystemiselec-
tronicallyinterrogatedandgoesoutwhenthe
engineisstartedifthecheckisnotyetcom-
plete.
IftheABSwarninglampfailstogoout,thisindi-
catesthatABShasbeendeactivatedduetoa
fault.Ifthewarninglightsintheinstrumentpanel
andon-boardcomputerlightupwhileyouare
driving,thisindicatesthatafaulthasoccurred.
Inbothcases,normalbraking,asinvehicles
withoutABS,isstillretained.
TheABSsystemshould,however,beexamined
atanauthorizedPorschedealerimmediatelyto
preventtheoccurrenceoffurtherfaults.
I>IftheABSsystembecomesinoperative,take
yourvehicletoyourauthorizedPorsche
dealerimmediately.
/!\Warning!
ThecontrolunitoftheABSbrakesystemis
setforstandardtiresize.Ifnon-standard
tiresareinstalled,thecontrolunitmaymis-
interpretthespeedofthevehicle,because
ofthevariantdataitreceivesfromthesen-
sorsontheaxles.
I>Useonlytiremakesandtypestestedby
Porsche.
Controls,Instruments
57

PorscheStabilityManagement
(PSM)
PSMisanactivecontrolsystemforstabilizing
thevehicleduringextremedrivingmaneuvers.
/!\.Warning!
Theincreasedcontrolthatisprovided
shouldnotinduceyoutotakegreaterrisks
withyoursafety.Thelimitsdictatedbythe
lawsofphysicscannotbeovercome,even
withPSM.
Theriskofaccidentsduetoinappropriate
speedcannotbereduced,evenbyPSM.
Thedriverbearstheresponsibilityforall
drivingmaneuvers.
[>Adaptyourdrivingstyletotheprevailingroad
andweatherconditions.
[>Obeyalltrafficlaws.
AdvantagesofPSM
-Superiortractionandlane-holdingabilityinall
drivingsituations-evenonroadsurfaces
withvaryingfriction.
-PSMactivelystabilizesthevehicleduringdy-
namicdrivingmanoeuvres(e.g.rapidsteering
movements,duringlanechangesoronalter-
natingcurves).
58Controls,Instruments
-Improvedbrakingstabilityincurvesandon
differentorvaryingroadsurfaces.
Readinessforoperation
ThePSMisengagedautomaticallyeverytime
youstarttheengine.
Function
Sensorsatthewheels,brakes,steeringsystem
andenginecontinuouslymeasure:
-Drivingspeed
-Directionoftravel
-Lateralacceleration
-Rateofturnaboutthevehicle'sverticalaxis
ThePSMusesthesevaluestodeterminethe
directionoftraveldesiredbythedriver.
PSMintervenesandcorrectsthecourseifthe
vehicle'sactualdirectiondeviatesfromthe
desiredcourse(steering-wheelposition).It
brakesindividualwheelsasneeded.Ifnecess-
ary,thePSMadditionallyinfluencestheengine
powerorthegear-changingcharacteristicofthe
Tiptronicinordertostabilizethevehicle.
TheeventsbelowinformthedriverofPSMcon-
troloperationsandwarnhimtoadapthisdriving
styletotheroadconditions:
-Theinformationlightintheinstrumentpanel
lightsup.
-Hydraulicnoisescanbeheard.
-Thevehicledeceleratesandsteering-wheel
forcesarealteredasthePSMcontrolsthe
brakes.
-Reducedenginepower.
-Thebrakepedalpulsatesanditspositionis
changedduringbraking.
However,itispossibleatanytimetoachieve
fullvehicledecelerationbyincreasingthefoot
pressureslightlyonthebrakepedal.

SelectorLeverPositions
P-Parking
lock
InselectorleverpositionP,thedrivenwheels
aremechanicallylocked.
[>
Selectonlywhencarhasbeenstopped.
[>Engageparkinglockafterapplyingthehand-
brakeandreleaseitbeforereleasingthe
handbrake.
Theignitionkeycanbewithdrawnonlyin
selectorleverposition
P.
R-Reverse

[>Selectonlywhencarhasbeenstoppedand
thebrakeisapplied.

N-Neutral

SelectorleverpositionNmustbeselectedfor
towingorincarwashes,forexample.
[>
Selectthedesiredpositionformovingoff(D,
MorR)onlywhentheengineisidlingand
whiledepressingthebrakepedal.
[>SelectpositionNwhiledrivingonlyifthecar
isthreateningtoskidinslipperyconditions.
OtherwiseNshouldnotbeselectedwhiledriv-
ing.
D-
Automaticselection
mode
[>
SelectpositionDfor"normal"driving.The
gearsareshiftedautomaticallyaccordingto
theacceleratorpositionandspeed.
Dependingonthewaythevehicleisdrivenand
ontheresistance(e.g.uphill),thegear-changing
pointsareshiftedtowardshigherorloweren-
gine-speedranges.
Theacceleratorposition,drivingspeed,engine
speed,longitudinalandlateralaccelerationand
theroadprofileallhaveaninfluenceonthe
gear-changingcharacteristic.
Unwantedupwardshifts,e.g.beforebends,are
preventedbyswiftlyreleasingtheaccelerator
pedal.
Dependingonlateralacceleration,upwardshifts
onbendsarenotmadeuntiltheengine-speed
limitisreached.
Underbraking,anddependingontheamountof
deceleration,theTiptronicshiftsdownearlier.
Forsubsequentcornering,therightgearisen-
gagedwhenpressureisappliedtothebrakes
beforethebend.
Thebendistakenintherightgear,andwhen
youaccelerateoutofthebendyoudonothave
toshiftdown.
Drivingoff
In2ndgear,thevehicledrivesoffwiththe
throttleonlyslightlyopen.
Driveoffin1stgearwiththethrottleopen
widerorwhentheengineiscold.
[>[>[>
ShiftingGear
131

BrakeFluidlevel
Followtheinstructionsinthe"Cautions"chapter.
Useonlynew(unused)OriginalPorsche
brakefluid.
174Maintenance,CarCare
/!\Warning!
Brakefluidishazardoustoyourhealth,and
maybefatalifswallowed.
Brakefluidalsoattackspaintwork.
~Keepbrakefluidoutofchildren'sreach.
~Takecarewhiletoppingoffbrakefluidnotto
soiltheluggagecompartmentoritemsoflug-
gage.
Checkingthebrakefluidlevel
Thereservoirforthehydraulicbrakingand
clutchsystemsisintheluggagecompartment.
~Checkthebrake-fluidlevelregularlyatthe
transparentreservoir.
Thefluidlevelshouldalwaysliebetweenthe
"Min."and"Max."marks.
Aslightdecreaseinthefluidlevelduetowear
andautomaticreadjustmentofthediscbrakes
isnormal.
If,however,thefluidlevelfallsmarkedlyor
belowthe"Min."mark,thebrakingsystemmay
havedevelopedaleak.
~Havethebrakingsystemcheckedimmediately
atanauthorizedPorschedealer.
Changingthebrakefluid
Brakefluidabsorbsmoisturefromtheairover
time.Thisaccumulationofwaterlowerstheboil-
ingpointand,undercertainoperatingcon-
ditions,canaffectthebrakingaction.
Thereforehavethebrakefluidchangedinac-
cordancewiththechangeintervalsstatedinthe
brochure"Maintenance".
..
WarninglightUSA
0
WarninglightCanada
Thebrake-fluidwarninglightsintheinstrument
panelandon-boardcomputerindicate:
-brake-fluidleveltoolow,
-inconjunctionwithlargepedaltravel,
abraking-circuitfailure.

Ifthewarninglightsshouldlightupwhile
driving:

~Stopimmediatelyinasuitableplace.
~Donotcontinuedriving.
Pleasehavethefaultremediedatyournear-
estauthorizedPorschedealer.