2019 MERCEDES-BENZ SL ROADSTER brake sensor

Protecting
theenvironment General
notes H
Environmental
note
Daimler's declaredpolicyisone ofcompre-
hensive environm entalprotect ion.
The object ivesareforthe natural resources
that form thebasis ofour existen ceon this
planet tobe used sparingly andinamanner
that takes therequirements ofboth nature
and humanity intoaccount.
You toocan help toprotect theenvironm ent
by operating yourvehicle inan environm en-
tally responsible manner.
Fuel consumpt ionand therate ofengine,
transm ission,brakeandtirewear areaffec-
ted bythese factors:
R operating conditionsof your vehicle
R your personal drivingstyle
You caninfluence bothfactors. Youshould
bear thefollowing inmind:
Operating conditions:
R avoid shorttripsasthese increase fuel
consumpt ion.
R alwa ysmake surethatthetire pressures
are correct .
R do not carry anyunnecessary weight.
R remove roofracks onceyounolonger
need them.
R aregularly servicedvehiclewillcont ribute
to environm entalprotect ion.You should
therefore adheretothe service intervals.
R alwa yshave service workcarried outata
quali fiedspecialist workshop.
Personal drivingstyle:
R do not depress theaccelerator pedal
when startin gthe engine.
R do not warm upthe engine whenthevehi-
cle isstationary.
R drive carefully andmaintain asafe dis-
tance fromthevehicle infront .
R avoid frequent, suddenacceleration and
braking. R
change gearingood timeanduseeach
gear onlyupto00C3 ofits maximum engine
speed.
R switch offthe engine instationary traffic.
R keep aneye onthe vehicle's fuelcon-
sumption. Environmental
concerns andrecom-
mendat ions
Wherever theoperating instructionsrequire
you todispose ofmaterials, firsttrytoregen-
erate orre-use them.Observe therelevant
environm entalrulesandregulations whendis-
posing ofmaterials. Inthis way youwillhelp to
protect theenvironm ent. Genuine
Mercedes-Benz parts H
Environmental
note
Daimler AGalso supplie srecondit ioned
major assemblies andparts which areofthe
same qualityas new parts. Theyarecovered
by the same Limited Warranty entitlements
as new parts.
! Air
bags andEmergen cyTensioning Devi-
ces, aswell ascont rolunits andsensors for
these restraint systems, maybeinstalled in
the following areasofyour vehicle:
R doors
R door pillars
R door sills
R seats
R cock pit
R instrumen tcluster
R cent erconsole
Do not install accessories suchasaudio sys-
tems inthese areas. Donot carry out
repairs orwelding. Youcould impair the
operating efficiency ofthe restraint sys-
tems.
Have aftermark etaccessories installedata
quali fiedspecialist workshop.
You could jeopardize theoperating safetyof
your vehicle ifyou useparts, tiresandwheels
as well asaccessories relevanttosafety which 24
Genuine
Mercedes-Benz partsIntrodu ction

R
setting amore favorable seatposition for
the front -passenger seat.
R vehicles withamulticontour seat:increasing
the airpressure inthe side bolsters ofthe
seat backrest.
! Make
surethatthere arenoobjects inthe
footwell orbehind theseats. Thereisadan-
ger that theseats and/or objects couldbe
damaged whenPRE-SA FE®
is activated.
Should anaccident notoccur, thepreventative
measures takenarereversed. Certainsettings
must bemade yoursel f.
X Ifthe seat beltpre-tensionin gis not
reduced, movetheseat backrest back
slightly.
Seat beltpre-tensionin gis released . PRE-SAFE
®
PLUS (anticipatory occu-
pant protection systemPLUS)
Introduction PRE-SA
FE®
PLUS isonly available invehicles
with theDriving Assistance package.
Using theradar sensor system, PRE-SAFE®
PLUS isable todetect thatahead-on orrear-
end collision isimminent. Incertain hazardous
situations, PRE-SAFE®
PLUS takes pre-emptive
measures toprotect thevehicle occupants.
Importa ntsafety notes The
intervent ionofPRE-SA FE®
PLUS cannot
prevent animminent collision.
The driver isnot warned abouttheintervent ion
of PRE-SA FE®
PLUS.
PRE-SA FE®
PLUS doesnotintervene ifthe
vehicle isbacking up.
When driving, orwhen parking orexiting a
parking spaceusingActive Parking Assist,
PRE-SA FE®
PLUS willnotapply thebrakes.
Function PRE-SA
FE®
PLUS intervenes incertain situa-
tions ifthe radar sensor system detects an
imminent head-onorrear-end collision. PRE-SA
FE®
PLUS takes thefollowi ngmeas-
ures depending onthe hazardous situation
detected:
R ifthe radar sensor system detects thata
head-on collision isimminent, theseat belts
are pre-tensioned.
R ifthe radar sensor system detects thata
rear-end collisionisimminent:
- the brake pressure isincreased ifthe
driver appliesthe brakes whenthevehicle
is stationary.
- the seat belts arepre-tensioned.
The PRE-SA FE®
PLUS braking application is
canceled:
R ifthe accelerator pedalisdepressed whena
gear isengaged
R ifthe risk ofacollision passesorisno lon-
ger detected
R ifAct ive Distance AssistDISTRONIC indi-
cates anintent iontointervene
If the hazardous situationpasseswithout
resulting inan accident, theoriginal settings
are restored. Automatic
measuresafteranacci-
dent
Immediately afteranaccident, thefollowi ng
measures areimplemented, dependingonthe
type andseverity ofthe impact:
R the hazard warning lampsareswitched on
R the emergency lightingisactivated
R the vehicle doorsareunlocked
R the front sidewindows arelowered
R the electrically adjustablesteeringwheelis
raised whenthedriver's doorisopened
R the engine isswitched offand thefuel sup-
ply iscut off
R vehicles withMercedes meconn ect:auto-
matic emergency call 56
Occ
upant safetySafety

The
pulsating brakepedalcanbeanindication
of hazardous roadcondit ions,andfunct ionsas
a reminder totake extracare while driving. BAS
(BrakeAssist System)
General information BAS
operates inemergenc ybraking situations.
If you depress thebrake pedalquickly, BAS
automatically booststhebraking force,thus
shorten ingthe stopping distance.
Import antsafety notes i
Observe
the"Importan tsafety notes" sec-
tion (Ypage 60). G
WARNIN
G
If BAS ismalfunct ioning,thebraking dis-
tanc ein an emergenc ybraking situation is
increased. Thereisarisk ofan accident .
In an emergenc ybraking situation, depress
the brake pedalwithfullforce. ABSprevent s
the wheels fromlockin g.
Br aking X
Keep thebrake pedalfirmly depressed until
the emergenc ybraking situation isover.
ABS prevent sthe wheels fromlockin g.
The brakes willfunct ionasusual onceyou
release thebrake pedal. BASisdeactivated. Br
ake Assist withcross-tr afficfunc-
tion
General information Brake
Assist withcross- trafficfunct ioncan
help youtominimize therisk ofacollision with
a vehicle orapedestrian andreduce the
effect sof such acollision. IfBrake Assist with
cross- trafficfunct iondetect sa danger ofcolli-
sion, youareassisted whenbraking.
i Observe
the"Importan tsafety notes" sec-
tion (Ypage 60).
Brake Assist withcross- trafficfunct ionisonly
availabl ein vehicles withtheDrivin gAssis-
tanc epackage. For
Brake Assist withcross- trafficfunct ionto
assist youwhen driving, theradar sensor sys-
tem andthecamera systemmustbeopera-
tional.
The sensor system andcamera systemhelp
Brake Assist withcross- trafficfunct iondetect
obstacles:
R that areinthe path ofyour vehicle foran
exten dedperiod oftime
R that cross thepath ofyour vehicle
In addition, pedestrians inthe path ofyour
vehicle canbedetect ed.
Brake Assist withcross- trafficfunct iondetect s
pedestrians usingtypical charact eristics such
as body contours andtheposture ofaperson
standin gupright.
If the radar sensor system orthe camera sys-
tem ismalfunct ioning,BrakeAssist withcross-
traff icfunct ionisrestr icted orno longer availa-
ble. Thebrake system isstill availab lewith
complete brakeboosting effectandBAS.
i Observe
therestr iction sdescribed inthe
"Importan tsafety notes" section
(Y page 61).
Import antsafety notes G
WARNIN
G
Act ive Brake Assist withcross- trafficfunc-
tion cann otalway sclearly identify objects
and complex trafficsituations.
In such cases, Active Brake Assist with
cross- trafficfunct ionmight:
R issue anunneces sarywarning orbrake
R issue nowarning ornot brake
Always paycareful attentiontothe traff ic
situation; donot rely onthe Active Brake
Assist withcross- trafficfunct ionalone.
Always beready tobrake andpossibly take
evasive action. G
WARNIN
G
Brake Assist withcross- trafficfunct ioncan-
not alway sclearly identify people,particu-
larly ifthey aremoving. BrakeAssist with
cross- trafficfunct ioncann otinter vene in
these cases. Thereisarisk ofan accident . Driving
safetysystems
61Safety
Z

Up
toaspeed ofapproximately 44mph
(70 km/h), BrakeAssist withcross-t raffic
function mayreact to:
R stationary objectsinthe path ofyour vehi-
cle, e.g. stopped orparked vehicles
R pedestrians inthe path ofyour vehicle
R obstacles crossingyourpath which movein
the detection rangeofthe sensors andare
detected
i If
Brake Assist withcross-t rafficfunction
requires aparticularl yhigh braking force,
preventative passengerprotectionmeasures
(PRE-SAF E®
)are activated atthe same time
(Y page 55).
X Keep thebrake pedaldepressed untilthe
emergency brakingsituation isover.
ABS prevents thewheels fromlocking.
Brake Assist withcross-t rafficfunction is
deactivated andthebrakes function asusua l
agai nif:
R you release thebrake pedal
R there isno longer arisk ofcollision
R no obstacle isdetected infront ofyour vehi-
cle
R you depress theaccelerator pedal
R you activate kickdown Active
BrakeAssis t
General information i
Observe
the"Important safetynotes" sec-
tion (Ypage 60).
Act ive Brake Assist consists ofadistance
warning function withanautonomous braking
function andAdaptive BrakeAssist.
Act ive Brake Assist canhelp youtominimize
the risk ofacollision withthevehicle infront
or reduce theeffects ofsuch acollision.
If Act ive Brake Assist detects thatthere isa
risk ofcollision, youwillbewarned visually
and acousticall y.Ifyou donot react tothe vis-
ual collision warningorthe warning tone,
autonomous brakingcanbeinitiated incritical
situations. Ifyou apply thebrake yoursel fin a
critical situation, AdaptiveBrakeAssist ofthe
Act ive Brake Assist system supports you. Importa
ntsafety notes In
particular, thedetection ofobstacles canbe
impaired if:
R there isdirt onthe sensors oranything else
covering thesensors
R there issnow orheavy rain
R there isinterferenc eby other radarsources
R there arestrong radarreflections, forexam-
ple inparking garages
R anarrow vehicle istraveling infront ,e.g. a
motorbike
R avehicle istraveling infront onadifferent
line
R you aredriving anew vehicle orservicing on
the Active Brake Assist system hasjust
been carried out
Observe theimportant safetynotesinthe
"Breaking-in notes"section (Ypage 125).
Followi ngdamage tothe front endofthe vehi-
cle, have theconfiguration andoperation of
the radar sensor checked ataqual ified spe-
cialist workshop. Thisalso appli estocollisions
at slow speeds wherethereisno visible dam-
age tothe front ofthe vehicle.
Activating/ deactivating Act
ive Brake Assist isautomaticall yactive
after switching onthe ignition.
You canactivate ordeactivate Active Brake
Assist usingtheon-board computer
(Y page 198). When deactivated, thedistance
warning function andtheautonomous braking
function arealso deactivated.
If Act ive Brake Assist isdeactivated, the00D4
symbol appearsinthe assistance graphicdis-
play .
Distance warningfunction General
information
The distance warningfunction canhelp youto
minimize therisk ofafront -end collision witha
vehicle aheadorreduce theeffects ofsuch a
collision. Ifthe distance warningfunction
detects thatthere isarisk ofacollision, you
will bewarned visuallyand acousticall y. Driving
safetysystems
63Safety Z

int
erve neinthe secases .There isarisk of
an acc ident .
Always payparticular attent ion tothe traffic
situat ionand beprepar edtobrak e,espe-
cially ifAc tiveBrak eAss istwith cross-traffic
func tion alert syou.
In order tomaint ainthe appropr iatedistance
to the vehic lein fro ntand thus preventacolli-
sion ,you must apply thebrak esyourself . G
WARN
ING
Ac tiveBrak eAss istwith cross-traffic func-
tion does notreact :
R to small people, e.g.childr en
R to animals
R to onc omin gvehic les
R when corner ing
As aresult ,Ac tiveBrak eAss istwith cross-
tr affic function may notwarn youorengag e
in all crit ical situat ions.There isarisk ofan
acc ident .
Always paycaref ulatt ent ion tothe traffic
situat ionand beready tobrak e.
In the even tof sno wfall orheavy rain,therec-
ogn ition canbeimpaired .
Recogn itionbythe radar sensor syst emisalso
impaired if:
R the reisdirt onthe sensors oranyt hing else
cov erin gthe sensors
R the reisint erfe rencebyoth erradar sources
R the reare strong radar reflections ,for exam -
ple inpark inggarages
R anarr owvehic leistravelin gin fro nt,e.g. a
mot orbik e
R avehic leistravelin gin fro nton adiffe rent
line
Recogn itionbythe camer asyst emisalso
impaired inthe even tof:
R dirt onthe camer aor ifthe camer ais cov -
ered
R glare onthe camer asyst em, e.g.fromthe
sun being lowinthe sky R
dark ness
R or if:
- pedest riansmove quickly,e.g. intothe
path ofthe vehic le
- the camer asyst emnolong errec ogn izes a
pedest rianasaperso ndue tospec ial
clot hing oroth erobje cts
- apedest rianiscon cealed byoth er
obje cts
- the typic aloutlin eof apedest rianisnot
dist inguish ablefromthe back groun d
Followin gdamage tothe frontend ofthe vehi-
cle, have theconfigurat ionand operat ionof
the radar sensors checkedataqualified spe-
cialist workshop. Thisalso applies tocollis ions
at slow speeds wherethereisno visible dam-
age tothe frontofthe vehic le.
Followin gdamage tothe windsh ield,have the
con figurat ionand operat ionofthe camer asys-
tem chec kedataqualified specialist work-
shop.
Function X
To acti vateor deact ivate:act ivat eor
deact ivateAc tiveBrak eAss istwith cross-
tr affic function using theon-board computer
(Y page 198).
When ActiveBrak eAss istwith cross-traffic
func tion isdeact ivated, the 00D4 symbol
appears inthe assist ancegraphic displayof
the multif unction display.
St artin gat aspeed ofaround 4mph (7km /h),
this func tion warns youifyou rapidly approac h
a vehic lein fro nt.An intermit tentwarnin gton e
will thensound andthe00BA distancewarnin g
lamp willlight upinthe instrumen tclust er.
X Brak eimmed iatelytodefuse thesituat ion.
or
X Take evasiv eact ion prov ided itis safe todo
so.
Ac tiveBrak eAss istwith cross-traffic function
can also brakethe vehic leautom atically under
the followin gcon dition s:
R the drive rand frontpassen gerhave their
seat belts fastened
and
R the vehic lespeed isbetwee napprox imately
4 mph (7km /h) and 124 mph (200 km/h) Driving
safety syst ems
71Safety Z

exitin
gaparking space.Makesurethatthere
are nopersons ,animals orobjec tsinthe
maneuverin garea when youaremaneuverin g
or parking .
! When
parking ,pay particular attentionto
objec tsabove orbelow thesensor s,such as
flower potsortrailer drawbars.
PARKTRONIC doesnotdetect suchobjec ts
when theyareinthe immediate vicinityof
the vehicle. Youcould damage thevehicle
or the objec ts.
The sensor smay notdetect snowandother
objec tsthat absorb ultrasonic waves.
Ultrason icsources suchasan automatic car
wash, thecompr essed-air brakesonatruc k
or apneumatic drillcould cause
PARKTRONIC tomalfunct ion.
PARKTRONIC maynotfunc tion correctlyon
uneven terrain.
Parkin gAssist PARKTRONIC isactivat edauto-
matically whenyou:
R switch onthe ignition
R shift thetran smission toposition 005B,005Eor
005C
R release theelectr icparking brake
Parkin gAssist PARKTRONIC isdeactivat edat
speeds above11mph (18km/ h).It is rea cti-
vate dat lowe rspe eds.
Rang eof the senso rs Gen
eral notes
Pa rking AssistPAR KTRONIC doesnot take into
acco untobstacl eslocate d:
R bel ow the dete ction range,such asper sons ,
ani mal sor obje cts
R ab ove thedete ction range,e.g. overhanging
lo ad s,tai lsecti onsorload ing ram psof
trucks 0043
Senso rsinthe front bumpe r,left-ha ndside
(e xamp le)
The sens orsmus tbe free from dirt, ice or
slu sh. The ycan othe rwisenot functi oncor-
rectl y.Clea nthe sens orsregularl y,taki ngcare
not toscra tchordamag ethem (Ypage 275 ).
Rang e Front
sensors Ce
nter Appr
ox.40in(app rox.
100 cm) Co
rners Appr
ox.24in(app rox.
60 cm) Dri
ving sys tems
173Dri ving and parkin g Z

Disp
laymes sages Poss
iblecauses/co nsequences and 0050 0050
Solu tions The
yellow 0024warninglamp lightsup and thered 0049 (USA
on ly) or0024 (Canadaonly) ind icat orlamp flashes .
It is no tpos sibleto apply theelec tric park ingbrak eman ually.
X Sh ift thetrans mis sion topos ition 005D.
X Vis itaqualif iedspecialistwor kshop . 0027
(USAon ly)
004D (Canadaonly)
Che ckBrakeFluid Che
ckBrakeFluid
Lev el Lev
el The
reisno ten ough brakeflui din thebrak efluid reservoir.
In addit ion,th e0027 (USAon ly) or004D (Canadaonly) warn ing
lamp lightsup intheins trumen tclus terand awarn ingtone soun ds.
G WAR
NING
The brak ingeffectmay beimp aire d.
The reisaris kof an acc iden t.
X Pull overand stop theveh iclesaf ely assoo nas pos sible,payin g
att ention toroa dand traff icco nd ition s.Do notco ntinu edri vin g
und erany circum stanc es.
X Se cur eth eveh icleagain strol lingaway (Ypage 146).
X Con sult aqualif iedspecialistwor kshop .
X Do notadd brak efluid .This does notco rrec tth emalf unction . 0026
Che ckBrakePad Che
ckBrakePad
Wea r Wea
r The
brak epads /linin gshav ereac hedtheir wear limit.
X Vis itaqualif iedspecialistwor kshop . PRE
-SAFEInoper a‐ PRE
-SAFEInoper a‐
tiv eSee Opera‐ tiv
eSee Opera‐
tor 'sManual tor
'sManual Im
por tantfun ction sof PRE -SAF E®
hav efail ed. Allot her occup ant
saf etysyst ems ,e. g. air bags ,rem ainavail able.
X Vis itaqualif iedspecialistwor kshop immediat ely. Act
ive Brake Act
ive Brake
Ass ist Functions Ass
ist Functions
Cur rently Limite d Cur
rently Limite d
See Operator'sMan ‐ See
Operator'sMan ‐
ual ual Ac
tive Brake Assis tis tempo rarily ino per ative.
Pos siblecaus esare:
R theradar sensor syst emistempo rarily ino per ative, e.g. due to
elec tromag netic radi ation emi tted bynearby TVorradi ostati ons
or other sour cesof elec tromag netic radi ation
R thesyst emisout side theoper ating tempe rature range
R theon -boar dvol tag eis toolow
Whe nth ecaus esstate dabov eno longer apply, thedisp laymes sage
disap pears.
Ac tive Brake Assis tis oper ationalagain .
If th edisp laymes sage does notdisap pear:
X Pull overand stop theveh iclesaf ely assoo nas pos sible,payin g
att ention toroa dand traff icco nd ition s.
X Se cur eth eveh icleagain strol lingaway (Ypage 146).
X Rest arttheen gin e. Disp
laymes sage s
211On -boar dcomp uter anddi sp lay s Z

Disp
laymes sages Poss
iblecauses/co nsequences and 0050 0050
Solu tions Act
ive Brake Act
ive Brake
Ass ist Functions Ass
ist Functions
Lim itedSee Opera‐ Lim
itedSee Opera‐
tor 'sManual tor
'sManual Ac
tive Brake Assis tis unav ailable duetoamalf unction .
X Vis itaqualif iedspecialistwor kshop . Act
ive Brake Act
ive Brake
Ass ist Functions Ass
ist Functions
Cur rently Limited Cur
rently Limited
See Operator'sMan ‐ See
Operator'sMan ‐
ual ual Ac
tive Brake Assis twit hcr oss -traf fic fun ction orPRE ‑SAF E®
PLU Sis
deac tivat ed and tempo rarily ino per ative.
Pos siblecaus esare:
R thesyst emisout side theoper ating tempe rature range
R theon -boar dvol tag eis toolow
R theradar sensor syst emistempo rarily ino per ative, e.g. due to
elec tromag netic radi ation emi tted bynearby TVorradi ostati ons
or other sour cesof elec tromag netic radi ation
R Mer cedes -AMG vehicles: ESP®
is deac tivat ed
Whe nth ecaus esstate dabov eno longer apply, thedisp laymes sage
disap pears.
Ac tive Brake Assis twit hcr oss -traf fic fun ction and PRE‑SAFE®
PLU S
are function alagain .
X Pull overand stop theveh iclesaf ely assoo nas pos sible,payin g
att ention toroa dand traff icco nd ition s.
X Se cur eth eveh icleagain strol lingaway (Ypage 146).
X Rest arttheen gin e.
X Mer cedes -AMG vehicles: swit chESP®
on again (Ypage 68). Act
ive Brake Act
ive Brake
Ass ist Functions Ass
ist Functions
Lim itedSee Opera‐ Lim
itedSee Opera‐
tor 'sManual tor
'sManual Ac
tive Brake Assis twit hcr oss -traf fic fun ction orPRE ‑SAF E®
PLU Sis
no tavail able duetoamalf unction .
X Vis itaqualif iedspecialistwor kshop . 212
Disp
laymes sage sOn -boar dcomp uter anddi sp lay s