2018 MERCEDES-BENZ S-CLASS CABRIOLET tires

Setting upthefo lding chock
Prepa ring theve hicle for a wheel change
Re quirementsRThe requ ired tire-change tool kit is available.
If yo ur vehicle is not equipped with the tire-
ch ange tool kit, consult a qualified specialist
wo rkshop tofind out about suitable tools.
RThe vehicle is not on a slope.
RThe vehicle is on solid, non-slippery and le vel
ground .
#Applythe electric parking brake manually.
#Mo vethe front wheels tothest ra ight-ahead
position.
#Ve hicles with automatic transmission:
shift into position j.
#Vehicles with AIR BODY CONT ROL:set the
normal vehicle le vel (→page 176).
#Switch off the engine.
#Make sure that the engine cannot bestar ted.
#Place choc ks orother suitable items under
th e front and rear of the wheel that is diago‐
nally opposite the wheel youwish tochange.
#Re mo vethe hub caps if necessary
(→page 386).
#Ra ising theve hicle (→page 387).
Re moving and in stalling hub caps
Re quirements:RThe vehicle is prepared for a wheel change
(→page 386).
Plast ic hub cap
#Toremo ve:turn the center co ver of the hub
cap counter-clockwise and remo vethe hub
cap.
#To install: make sure that the center co ver of
th e hub cap is turned counter-clockwise.
#Po sition the hub cap and turn the center
co ver clockwise until the hub cap engages
ph ysically and audibly.
386
Wheels and tires

Aluminum hub cap
#Toremo ve:position soc ket2 on hub cap
1.
% The soc ket can be found inthe tire-change
to ol kit.
#Po sition wheel wrench 3on soc ket2.
#Using wheel wrench 3, turn hub cap1
counter-clo ckwise and remo veit.
#To install: position hub cap 1and turn until
it is comple tely flush withth e wheel.
#Po sition soc ket2 on hub cap 1.
#Attach wheel wrench 3tosoc ket2 and
tighten the hub cap clockwise.
Specified tightening torq ue: 18lb-ft
(25 Nm).
#Ra ise theve hicle (→page 387).
Ra ising theve hicle when changing a wheel
Re quirements:RThere are no persons in theve hicle.
RThe vehicle has been prepared for a wheel
ch ange (→page 386).
RThe hub caps ha vebeen remo ved
(→page 386).
Impor tant no tes on using the jack:
ROnly use theve hicle-specific jack that has
been tested and appr ovedby Mercedes-Benz
to raise theve hicle.
RThe jack is only designed forra ising and
holding theve hicle for a short time while a
wheel is being changed and not for mainte‐
nance workunder theve hicle.
RThe jack must be placed on a firm ,fl at and
non-slip sur face. If necessar y,use a lar ge,
load-bearing, non-slip underla y.
RThefoot ofthe jack must be positioned verti‐
cally under the jacking point.
Ru les of conduct when theve hicle is raised:
RNe ver place your hands or feet under the
ve hicle.
RDo not lie under theve hicle.
RDo not start the engine and do not release
th e electric parking brake.
RDo not open or close any doors or the trunk
lid.
Wheels and tires 387

#Usingthe lug wrench, loosen the wheel bolts
on the wheel youwish tochange byabout
one full turn. Do not unscr ewthe bolts com‐
ple tely.Po sition of jack support points
&
WARNING Risk of injury from incorrect
positioning of the jack
If yo u do not position the jack cor rectly at
th e appropriate jacking point of theve hicle,
th e jack could tip with theve hicle raised.
#Only position the jack at the appropri‐
ate jacking point of theve hicle. The
base of the jack must be positioned ver‐
tically under the jacking point of the
ve hicle.
* NO
TEVehicle damage from the jack
Ifyo udo not position the jack cor rectly at
th e appropriate jack support point of the
ve hicle, the jack could tip over with theve hi‐
cle raised.
#The jack is designed exclusively for
jacking up theve hicle at the jack sup‐
port points.
#Ta ke thera tchet wrench out of the tire-
ch ange tool kit and place it on the he xagon
nut of the jack so that the lettering "AUF" is
visible.
388 Wheels and tires

#Position jack 2at jack support point 1.
#Turn ratchet wrench 3clockwise until jack
2 sits comple tely on jack support point 1
and the base of the jack lies evenly on the
ground .
#Continue toturn ratchet wrench 3until the
tire is raised a maximum of 1.2 in (3 cm) off
th e ground.
#Loosen and remo vethe wheel (→page 389).
Re moving a wheel
Requirement:RThe vehicle is raised (→page 387).
When changing a wheel, avoid applying any forc e
to the brake discs, since this could impair the
le ve l of com fort when braking.
* NO
TEDama getothre ading from dirt on
wheel bolts
#Do not place wheel bolts in sand or on
a dirty sur face.
#Un scr ew the uppermost wheel bolt com‐
ple tely.
#Scr ew centering pin 1instead of the wheel
bolt into theth re ading.
#Un scr ew there maining wheel bolts fully.
#Re mo vethe wheel.
#Ins tallth e new wheel (→page 389).
Installing a new wheel
Re quirement:RThe wheel is remo ved (→page 389).
Wheels and tires 389

&WARNING Risk of accident from losing a
wheel
Oiled, greased or damaged wheel bolt/wheel
nut thre ads or wheel hub/wheel mounting
bolt thre ads can cause the wheel bolts/
wheel nuts tocome loose.
As a result, you could lose a wheel while driv‐
ing.
#Ne ver oil or grease theth re ads.
#In theeve nt of damage totheth re ads,
con tact a qualified specialist workshop
immediatel y.
#Have the damaged wheel bolts or dam‐
aged hub thre ads replaced.
#Do not continue driving.
#Obser vethe information on thech oice of
tires (→page 382).
Fo r tires with a specified direction of rotation, an
ar row onthe side wall of the tire indicates the
cor rect dire ction of rotation. Observ eth e direc‐
tion of rotation when ins talling.
#Slide the wheel tobe mounted onto the cen‐
te ring pin and push it on.
&
WARNING Risk of injury from tightening
wheel bolts and nuts
If yo u tighten the wheel bolts or wheel nuts
when theve hicle is raised, the jack could tip.
#Only tighten wheel bolts or wheel nuts
when theve hicle is on the ground.
#Fo r saf etyre asons, only use wheel bolts
whic h havebeen appr ovedby Mercedes-
Benz and forth e wheel in question.
* NO
TEDama getopaintwork of the wheel
ri m when scr ewing on thefirs t wheel bolt
If th e wheel has too much play when scr ew‐
ing in thefirs t wheel bolt, the wheel rim paint
can be dama ged.
#Press the wheel firm lyagainst the
wheel hub when scr ewing on thefirs t
wheel bolt.
#Ti ghten the wheel bolts until they are finger-
tight.
#Un scr ew the centering pin.
#Tighten the last wheel bolt until it is finger-
tight.
#Lo we rth eve hicle (→page 390).
Lo weri ngtheve hicle af ter a wheel change
Re quirements:RThe new wheel has been ins talled
(→page 389).
#Place thera tchet wrench onto the he xagon
nut of the jack so that the lettering "AB" is
visible.
#To lowe r the vehicle: turnthera tchet
wrench of the jack counter-clockwise.
390
Wheels and tires

#Tighten the wheel bolts evenly in a diagonal
pattern in the order indicated (1 to5).
Specified tightening torq ue: 111 lb-ft
(150 Nm).
& WARNING Risk of injury thro ugh incor‐
re ct tigh tening torque
Th ewheels could come loose if the wheel
bolts or wheel nuts are not tightened tothe
prescribed tightening torque.
#Ha ve the tightening torque checked
immediately at a qualified specialist
wo rkshop af terch anging a wheel.
#Check the tire pressure of the newly moun‐
te d wheel and adjust according ly.
#Ve hicles with a tire pressure monitoring
sy stem: Restart the tire pressure monitoring
sy stem (
→page 369).
Make sure toobser vethefo llowing fur ther rela‐
te d subjec t:
RNotes on tire pressure (→page 364)
Wheels and tires 391

Displaymessages
Possible causes/consequences and MSolutions
É
Stop Vehicle Vehicle Too
Low*Y
ou ha vepulled away despite theve hicle le vel being too lo w.
#Pull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions.
The vehicle rises tothe selected vehicle le vel.
#Wa it until the display message disappears before pulling away.
If th e display message does not disappear and a warning tone also sounds, AIR BODY CONTROL is malfunctioning:
#Do not drive fasterthan 50 mph (80 km/h) and consult a qualified specialist workshop immediatel y.
* NO
TEThe tires of the front axle or the front fende rscould be damaged bylarge steering mo vements
#Av oid large steering mo vements while driving and lis tenfo r scraping sounds.
#If yo u hear scra ping sounds, pull over and stop theve hicle safely, paying attention toroad and traf fic con‐
ditions, and set a higher vehicle le vel if possible.
#Set a higher vehicle le vel .
Depending on the malfunction, theve hicle is raised.
Display messages and warning/indicator lamps 421

Displaymessages
Possible causes/consequences and MSolutions
Malfunction Drive at Max.
50 mph*T
he AIR BODY CONTROL function is restricted. The vehicle's handling characteristics may be af fected.
* NO
TEThe tires of the front axle or the front fende rscould be damaged bylarge steering mo vements#Av oid large steering mo vements while driving and lis tenfo r scraping sounds.
#If yo u hear scra ping sounds, pull over and stop theve hicle safely, paying attention toroad and traf fic con‐
ditions, and set a higher vehicle le vel if possible.
#Do not drive fasterthan 50 mph (80 km/h).
#Visit a qualified specialist workshop.
Active Lane Keeping Assist
Currently Unavailable See
Operator's Manual *A
ctive Lane Keeping Assist is temp orarily una vailable.
The ambient conditions are outside the sy stem limitations (
→page 205).
Ve hicles with Active Steering Assis t:The camera view may be restricted bythe windshield.
#Drive on.
As soon as the ambient conditions are within the sy stem limitations, the sy stem will become available again.
If th e display message does not disappear on vehicles with Active Steering Assis t:
#Pullover and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions.
#Clean the windshield.
Active Lane Keeping Assist
Inoperative *A
ctive Lane Keeping Assist is malfunctioning.
#Visit a qualified specialist workshop.
422
Display messages and warning/indicator lamps