tire pressure MERCEDES-BENZ S-CLASS CABRIOLET 2018 User Guide

Menus and submenus
Functions in the Service menu of the on-
board compu ter
On-board computer:
,Service
#To select the function: swipe upwards or
down wards on the left-hand Touch Control.
#Press the left-hand Touch Control.
Fu nctions in theService menu:
RMessage memory (→page 404)
RTires:
-Checking the tire pressure with the tire
pressure monitoring sy stem
(
→page 368)
-Re starting the tire pressure monitoring
sy stem (→page 369)
RASSYST PLUS : calling upthe service due
date (→page 327)
Calling up the Assistance graphic display
On-board computer:
,DriveAssist
% When you ha veset thest yle to Progressive,
yo u can view the assis tance graphic menu
contents in the left-hand portion of the
instrument displa y.
The following displa ysare available from the
Assist ance graphic menu:
RAssistance graphic
RAt tention le vel (→page 195)
#To switch between the displa ys:swipe
up wa rds or down wards on the left-hand
To uch Control.
Status displa ysinthe Assis tance graphic:
Ré: ATTENTION ASSIST deactivated
Ræ: Active Brake Assi stdeactivated
RLight lane markings: Active Lane Keeping
Assist activated
RGreen lane markings: Active Lane Keeping
Assist active
21 2
Instrument Display and on-board computer

Information on using a powerwa sher
&
WARNING Risk of accident when using
high-pressure cleaning equipment wi th
ro und-s pray nozzles
The wate r jet from a round-s pray nozzle (dirt
grinder) may cause damage totires and sus‐
pension components that is not visible.
Components damaged in this wa yma yfa il
unexpec tedly.
#Do not use high-pressure cleaning
equipment wi thround-s pray nozzles to
clean your vehicle.
#Damaged tires or suspension compo‐
nents must be replaced immediatel y.
Toavo id damage to yourvehicle, obser vethefo l‐
lowing when using a po werwa sher:
RKeep the SmartK eyat least 10ft(3 m) away
from theve hicle. Otherwise the trunk lid
could open unintentionall y.
RMaintain a distance of at least 11.8 in
(30 cm) totheve hicle.
RVe hicles with deco rative foil: parts of your
ve hicle are co vered with a decorative foil.
Maintain a dis tance of at least 27.6 in
(70 cm) between thefo il-c ove red parts of the
ve hicle and the nozzle of the high pressure
cleaner. Mo vethe po werwa sher nozzle
around whilst cleaning.
RObser vethe information on the cor rect dis‐
ta nce in the equipment manufacturer's oper‐
ating instructions.
RDo not point the nozzle of the po werwa sher
directly at sensitive parts such as tires, slits,
electrical component parts, batteries, light
sources and ventilation slot s.
Washing theve hicle byhand
Obser vethe legal requ irements, e.g. in a number
of countries, washing byhand is only permitted
in specially designated wash ba ys.
#Use a mild cleaning agent, e.g. car shampoo.
#Wa shtheve hicle with luk ewarmwate r using
a soft car sponge. When doing so, do not
ex pose theve hicle todirect sunlight.
#Carefully hose theve hicle off with water and
dry using a chamois. Take care not topoint
th ewate r jet directly towa rdsth e air inlet
grille.
Maintenance and care 335

Intheeve nt of a flat tire, thefo llowing options
are available depending on your vehicle's equip‐
ment:
RVe hicles with MOExtended tires: it is pos‐
sible tocontinue the journey for a short
period of time. Make sure you observ eth e
no tes on MOExtended tires (run-flat tires)
(
→page 343).
RVe hicles with a TIREFIT kit: you can repair
th e tire so that it is possible tocontinue the
journ eyfor a short period of time. Todo this,
use the TIREFIT kit (
→page 344).
RVe hicles with Mercedes-Benz
mbrace®(USA only): you can make a call for
Ro adside Assis tance via theove rhead control
panel in the case of a breakdown
(
→page 294).
RAll vehicles: change the wheel
(→page 386).
Note s on MOExtended tires (run-flat tires)
&
WARNING Risk of accident when driving
in li mp-home mode
When driving in emergency mode the han‐
dling characteristics are impaired, e.g. when
cornering, when accelerating stronglyand
when braking.
#Do not exceed the specified maximum
speed.
#Av oid any abrupt steering and driving
maneuvers as well as driving over
obs tacles (curbs, pot holes, off-road).
This applies, in part icular,toa loaded
ve hicle.
#Stop driving in the emer gency mode if
yo u notice:
Rbanging noise
Rvehicle vibration
Rsmoke which smells like rubber
Rcontinuous ESP®inter vention
Rcrac ksin tire side walls
#After driving in emergency mode ha ve
th erims checkedby aqu alified special‐
ist workshop with rega rd totheir fur ther
use.
#The defective tire must be replaced in
eve rycase.
With MOExtended tires (run-flat tires), you can
continue todrive your vehicle even if there is a
tot al loss of pressure in one or more tires. How‐
eve r,th e tire af fected must not show any clearly
visible damage.
Yo u can recognize MOExtended tires bythe
MOExtended marking which appears onthe side
wa ll of the tire.
Ve hicles with tire pressure monitoring sys‐
te m: MOExtended tires may only be used in con‐
junction wi than activated tire pressure monitor‐
ing sy stem.
If a pressure loss warning message appears in
th e multifunction display:
RCheck the tire for dama ge.
RIf driving on, obser vethefo llowing no tes.
Breakdown assis tance 34
3

Drivingdistance possibl ein limp-hom emod e
af te r the pressure loss warning:
Load condition Driving distance pos‐
sible in limp-homemode
Pa rtially laden 50 miles (80 km)
Fu lly laden 19miles (30 km)
RThe driving dis tance possible in li mp-home
mode may vary depending on the driving
st yle.
RMaximum permissible speed 50 mph
(80 km/h).
If a tire has gone flat and cannot be replaced
with an MOEx tended tire, you can use a stand‐
ard tire as a temp orary measure.
TIREFIT kit storage location
The TIREFIT kit is located under the trunk floor.
Mercedes‑AMG vehicles: observeth e no tes in
th e Supplement. Otherwise, you may not recog‐
nize dangers.
1Ti re sealant bottle
2Tire inflation compressor
Using the TIREFIT kit
Re quirements
Ha ve thefo llowing tools readily available:
RTire sealant bottle
RTIREFIT sticke r pr ovided
RTire inflation compressor
RDisposable glove s
Yo u can use TIREFIT tire sealant toseal per fora ‐
tion damage of upto0.16 in (4 mm), particular lyth
ose in the tire conta ct surface.You can use
TIRE FIT in outside temp eratures down to-4 °F
(-20 °C).
& WARNING Risk of accident when using
tire sealant.
In thefo llowing situations, the tire sealant is
unable toprov ide suf ficient breakdown assis‐
ta nce, as it is unable toseal the tire properly:
RThere are cuts or punctures in the tire
larger than those pr eviously mentioned.
RThe wheel rim is dama ged.
RYo u ha vedriven at a very low tire pres‐
sure or on a flat tire.
#Do not continue driving.
#Consult a qualified specialist workshop.
&
WARNING Risk of injury and poisoning
from tire sealant
The tire sealant is harmful and causes ir rita ‐
tion. Do not allow it tocome into contact
wi th th e skin, eyes or clo thing, and do not
34 4
Breakdown assis tance

#Pushthe plug of hose 5into flange 6of
tire sealant bottle 1until the plug engages.
#Place tire sealant bottle 1head down wards
into recess 2ofthe tire inflation compres‐
sor.
#Re mo vetheva lve cap from valve 7 onthe
defective tire.
#Scr ew filling hose 8onto valve 7.
#Insert plug 4into a 12V soc ket in your
ve hicle.
#Switch on the ignition.
#Press on and off switch 3onthe tire infla‐
tion compressor.
The tire inflation compressor is switched on.
The tire is inflated. Fir st, tire sealant is pum‐
ped into the tire. The pressure may brief ly
ri se toappr oximately 500 kPa (5 bar/73 psi).
Do not switch off the tire inflation compres‐
sor du ring this phase.
#Let the tire inflation compressor runfo r a
maximum of eight minutes.
The tire should then ha veattained a tire
pressure of at least 180 kPa (1.8 bar/26 psi).
If tire sealant leaks out, make sureyou clean the
af fected areas as quickly as possible. It is pref‐
erable touse clean water.
If yo uge t tire sealant on your clo thing, ha veit
cleaned as soon as possible with per chloroe thy‐
lene.
If atire pressure of 180 kPa (1.8 bar/26 psi)
has not been attained af ter eight minutes:
#Switch off the tire inflation compressor.
#Un scr ew thefilling hose from theva lve of the
defective tire.
Please no tethat tire sealant may leak out when
unscr ewing thefilling hose.
#Ve ry slowly drive forw ards or reve rse appr ox‐
imately 33 ft(10 m).
#Pump up the tire again.
Af ter a maximum of eight minutes the tire
pressure must be at least 180 kPa (1.8 bar/
26 psi).
& WARNING Risk of accident due tothe
specified tire pressure not being reached
If th e specified tire pressure is not reached
af te rth e specified time, the tire is too badly
damaged. The tire sealant cannot repair the
tire in this ins tance.
Dama ged tires and a tire pressure that is too
low can significantly impair braking and han‐
dling characteristics.
#Do not continue driving.
#Consult a qualified specialist workshop.
34 6
Breakdown assis tance

If a tire pressureof180 kPa (1.8 bar/26 psi)
has been attained af ter eight minutes:
&
WARNING Risk of accident from driving
wi th sealed tires
A tire temp orarily sealed with tire sealant
impairs handling characteristics and is not
suitable for higher speeds.
#Ad apt your dr ivingst yle according lyand
drive carefull y.
#Do notexceed the specified maximum
speed with a tire that has been sealed
using tire sealant.
Observ eth e maximum permissible speed for a
tire sealed with tire sealant 50 mph(8 0 km/h).
#Af fix th e upper section of the TIREFIT sticke r
to the instrument clus ter where it will be eas‐
ily seen bythe driver.
* NO
TEStaining caused byleaking tire
sealant
Af ter use, excess tire sealant may leak out
from thefilling hose.
#Therefore, place thefilling hose in the
plastic bag that con tained the TIREFIT
kit.
+ENVIRONMEN TALNO TEEnvironmental
pollution caused byenvironmen tally ir re‐
sponsible disposal
Ti re sealant contains polluta nts.
#Have the tire sealant bottle disposed of
professionall y,e.g. at an authorized
Mercedes-Benz Center.
#Switch off the tire inflation compressor.
#Un scr ew thefilling hose from theva lve of the
defective tire.
#St ore the tire sealant bottle, the tire inflation
compressor and thewa rning triangle.
#Pull away immediatel y.
#Stop driving af ter app roxima tely ten minu tes
and check the tire pressure using the tire
inflation compressor.
The tire pressure must now be at least
13 0 kPa (1.3 bar/19 psi).
&
WARNING Risk of accident due tothe
specified tire pressure not being reached
If th e specified tire pressure is not reached
af te r a brief drive, the tire is too badly dam‐
aged. The tire sealant cannot repair the tire
in this ins tance.
Dama ged tires and tire pressure that is too
low can significantly impair the braking prop‐
erties and the handling characteristics.
#Do not continue driving.
#Consult a qualified specialist workshop.
In cases such as the one mentioned abo ve, con‐
ta ct an au thorized Mercedes-Benz Center. Or
call 1-800-FOR-MERC edes (inthe USA) or
1-800-387-0 100 (in Canada).
#Cor rect the tire pressure if it is still at least
13 0 kPa (1.3 bar/19 psi). See theTire and
Loading Info rmation placard on the driver's
side B‑pillar or the tire pressure table in the
fuel filler flap forva lues.
#To increase the tire pressure: switchon
th e tire inflation compressor.
Breakdown assis tance 34
7

#Toreduce the tire pressure: press pressure
re lease button 1next topressure gauge
2.
#When the tire pressure is cor rect, unscr ew
th efilling hose from theva lve of the sealed
tire.
#Scr ew theva lve cap onto theva lve of the
sealed tire.
#Pull the tire sealant bottle out of the tire
inflation compressor.
The filling hose stay s on the tire sealant bot‐
tle.
#Drive tothe nearest qualified specialist work‐
shop and ha vethe tire, tire sealant bottle and
fi lling hose replaced there.
Bat tery (vehicle)
Note s onthe12 V battery
&
WARNING Risk of an accident due to
wo rkcar ried out incor rectly on the bat‐
te ry
Wo rkcar ried out incor rectly on the battery
can, forex ample, lead toa short circuit. This
can lead tofunction restrictions in saf ety-re l‐
eva nt sy stems, forex ample the lighting sys‐
te m, ABS (anti-lock braking system) or ESP
®
(Elect ronic Stability Prog ram). The operating
saf etyof your vehicle may be restricted.
Yo u could lose cont rol of theve hicle in the
fo llowing situations:
Rwhen braking
Rin theeve nt of ab rupt steering maneuvers
and/or when theve hicle's speed is not
adap tedto thero ad conditions
#In theeve nt of a short circuit or a simi‐
lar incident, contact a qualified special‐
ist workshop immediately.
#Do not continue driving.
#Alw ays ha vewo rkon the battery car ried
out at a qualified specialist workshop.
RFu rther information on ABS (→page 151)
RFu rther information on ESP®(→page 152)
Fo r saf etyre asons, Mercedes-Benz recommends
th at you only use batte ries which ha vebeen tes‐
te d and appr oved foryo ur vehicle byMercedes-
Benz. These batteries pr ovide inc reased impact
pr otection toprev ent vehicle occupants from
suf fering acid bu rns should the battery be dam‐
aged in theev ent of an accident.
34 8
Breakdown assis tance

Notes on noise or unusual handling charac‐
te rist ics
While driving, pay attention tovibrations, noises
and unusual handling characteristics, e.g. pulling
to one side. This may indicate that the wheels or
tires are damaged. If you suspect that a tire is
defective, reduce your speed immediatel y.Stop
th eve hicle as soon as possible tocheck the
wheels and tires for dama ge. Hidden tire dam‐
age could also be causing the unusual handling
ch aracteristics. If youfind no signs of damage,
ha ve the tires and wheels checked at a qualified
specialist workshop.
Re gular checking of wheels and tires
&
WARNING Risk of accident from dam‐
aged tires
Dama ged tires can cause tire pressure loss.
As a result, you could lose cont rol of your
ve hicle.
#Check the tires regularly for signs of
dama geand replace any damaged tires
immediatel y.
&
WARNING Risk of aquaplaning due to
insuf ficient tire tread
Insuff icient tire tread will result in reduced
tire grip. The tire tread is no longer able to
dissipate water.
This means that in heavy rain or slush the
ri sk of hydroplaning is increased, in particu‐
lar if vehicle speed is not adap tedto suit the
conditions.
If th e tire pressure is too high or too lo w,
tires may exhibit dif fere nt le vels of wear at
dif fere nt locations on the tire conta ct sur‐
fa ce.
#Thus, you should regularly check the
tread de pth and the condition of the tire
conta ct surf ace across the entire width
of all tires.
Minimum tread dep thfor:
RSummer tires: âin (3 mm)
RM+S tires: ãin (4 mm)
#For saf etyre asons, replace the tires
before the legally prescribed limit for
th e minimum tread dep thisreached.
Car ryout thefo llowing checks on all wheels reg‐
ularly, at least once a month or as requ ired, e.g.
prior toa long journey or driving off- road:
RCheck the tire pressure (→page 364).
RVisual inspection of wheels and tires for
damage.
RCheck theva lve caps.
The valves must be pr otected against mois‐
ture and dirt bytheva lve caps appr oved
especially foryo ur vehicle byMercedes-Benz.
RVisual check of the tire tread dep thand the
tire contact surf ace condition across the
entire width.
362 Wheels and tires

Tire pressure
Note s on tire pressure
&
WARNING Risk of accident due toinsuf‐
fi cient or excessive tire pressure
Underinfla ted or overinfla ted tires pose the
fo llowing risks:
RThe tires may bur st, especially as the
load and vehicle speed increase.
RThe tires may wearexc essively and/or
une venly, which may greatlyimpair tire
traction.
RThe driving characteristics, as well as
st eering and braking, may be greatly
impaired.
#Comply with there commended tire
pressure and check the tire pressure of
all tires including the spare wheel regu‐
larly:
Rat least once a month
Rwhen the load changes
Rbefore embarking on a longe r journey
Rif operating conditionschange, e.g. off-
ro ad driving
#Ad just the tire pressure as necessar y.
Driving withtire pressure that is too high or too
low can:
RSho rten the service life of the tires.
RCause increased tire damage.
RAd versely af fect driving characteristics and
th us dr iving saf ety, e.g. due toaquaplaning.
&
WARNING Risk of an accident due to
insuf ficient tire pressure
Ti re s with pressure that is too low can over‐
heat and bur stas a result.
In addition, they also suf fer from excessive
and/or ir regular wear, which can significantly
impair the braking properties and the han‐
dling characteristics.
#Av oid excessively low tire pressures in
all the tires, including the spare wheel.
Tire pressure which is too low can cause:
RTire defects as a result of overheating
RImpaired handling characteristics
RIrre gular wear
RIncreased fuel consum ption
&
WARNING Risk of accident from exces‐
sive tire pressure
Ti re s with excessively high pressure can
bur stbecause they are damaged more easily
by highw ayfill, pot holes etc.
In addition, they also suf fer from ir regular
we ar, which can significantly impair the brak‐
ing properties and the handling characteris‐
tics.
#Av oid excessively high tire pressures in
all the tires, including the spare wheel.
Excessively high tire pressure can result in:
RIncreased braking dis tance
RImpaired handling characteristics
RIrre gular wear
364
Wheels and tires

RImpaired driving comfort
RSusceptibility todamage
&
WARNING Risk of accident caused by
re peated drop in tire pressure
If th e tire pressure drops repeatedly, the
wheel, valve or tire may be damaged.
Insuf ficient tire pressure can cause the tires
to bur st.
#Inspect the tire for signs of fore ign
objects.
#Check whe ther the wheel or valve has a
leak.
#If yo u are unab leto rectify the damage,
conta ct aqualified specialist workshop.
Yo u can find information on tire pressures for
th eve hicle's factor y-ins talled tires on thefo llow‐
ing labels:
RTi re and Loading Info rmation placard on the
B‑pillar of your vehicle (→page 370).
RTire pressure table on the inside of the fuel
fi ller flap (→page 365). Observ
eth e maximum tire pressure
(
→page 376).
Us e a suitabl epressu regauge tocheck the tire
pressure. The outer appearance of a tire does
not permit any reliable conclusion about the tire
pressure.
Ve hicles with a tire pressure monitoring sys‐
te m: You can also check the tire pressure using
th e on-board computer.
Only cor rect tire pressures when the tires are
cold. Conditions for cold tires:
RThe vehicle has been par ked with the tires
out of direct sunlight for at least thre e hours.
RThe vehicle has tr aveled less than 1 mile
(1.6 km).
A rise in the tire temp erature of 18°F (10 °C)
increases the tire pressure byappr ox.10 kPa
(0.1 bar/1.5 psi). Take this into account when
ch ecking the tire pressure of warm tires.
The tire pressure sre commended for increased
load/speed in the tire pressure table can af fect
th eride comfort.
&
WARNING Risk of accident from unsuita‐
ble accessori es onthe tire valves
If yo u mount unsuitable accessories onto tire
va lves, the tire valves may be overloaded and
malfunction, which can cause tire pressure
loss. Tire pressure monitoring sy stems for
re trofitting will cause the tire valve toremain
open. This can also result in tire pressure
loss.
#Only scr ewstandard valve caps or valve
caps specifically appr ovedby
Mercedes-Benz foryo ur vehicle onto
th e tire valve.
Ti re pressure table
The tire pressure table is on the inside of the
fuel filler flap.
% The data shown in the images is example
data.
Wheels and tires 365