2019 MERCEDES-BENZ S-CLASS CABRIOLET tire pressure

#
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. #
Screw 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. Batte
ry(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-lo ckbraking sy stem) or ESP ®
(Elect ronic Stability Prog ram). The operating
saf ety of your vehicle may be restricted.
Yo u could lose cont rol of theve hicle in the
fo llowing situations:
R when braking
R intheeve nt of ab rupt steering maneuvers
and/or when theve hicle's speed is not
adap tedto thero ad conditions #
Intheeve nt of a sho rtcircuit 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. R
Further information on ABS (→ page156)
R Further information on ESP ®
(→ page 156)
Fo r saf etyre asons, Mercedes-Benz recommends
th at you on lyuse bat teries 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. 362
Breakdown assis tance

Note
s 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. Note
s onregular lyinspecting 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
Insu fficient 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 surface across the entire width
of all tires. Minimum tread dep
thfor:
R Summer tires: 00CEin (3 mm)
R M+S tires: 00CFin (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:
R Check the tire pressure (→ page377).
R Visually inspect tires and wheels for dama ge.
R Check 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.
R Visual check of the tire tread dep thand the
tire contact su rface across the entire width.
The minimum tread dep thfor summer tires is
00CE in (3 mm) and for winter tires 00CFin
(4 mm). 376
Wheels and tires

Six mar
ks1 show where the bar indicators
(ar row ) are integrated into the tire tread. They
are visible once a tread dep thof appr oximately
00CD in (1.6 mm) has been reached. Note
s on snow chains &
WARNING Risk of accident due toincor‐
re ct mounting of snow chains
If yo u ha vemounted snow chains tothe front
wheels, the snow chains may drag against
th eve hicle body or chassis components. This could cause damage
totheve hicle or
th e tires. #
Never mount snow chains on the front
wheels. #
Only mount snow chains on there ar
wheels in pairs. *
NO
TEDama getothe wheel trim from
mounted snow chains If sn
ow ch ains are moun tedto steel wheels,
th e wheel trims can be damaged. #
Remo vethe wheel trims of steel wheels
before mounting snow chains. R
Snow chains are on ly permissible for cer tain
wheel/tire combinations. You can obtain
information about this from an authorized
Mercedes-Benz Center.
R For saf etyre asons, on lyuse sn ow chainsthat
ha ve been specifically appr oved foryo ur
ve hicle byMercedes-Benz, or snow chains
with the same quality standard. R
If sn ow ch ains are ins talled, the maximum
permissible speed is 30 mph (50 km/h).
R Vehicles with Active Parking Assis t:Do
not use Parking Assist PARKTRONIC when
sn ow ch ains ha vebeen ins talled.
R Vehicles with AIR BODY CONT ROL or
MAGIC BODY CONT ROL:If sn owchains are
installed, on ly driveatraised vehicle le vel.
% You can deactivate ESP ®
to pull away
( → page 159). This allo wsthe wheels to
spin, achieving an increased driving forc e. Ti
re 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:
R The tires may bur st, especially as the
load and vehicle speed increase. Wheels and tires
377

R
The tires may wearexc essively and/or
une venly, which may greatlyimpair tire
traction.
R The 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:
R at least once a month
R when the load changes
R before embarking on a lon ger journey
R if operating conditions change, e.g. off-
ro ad driving #
Adjust the tire pressure as necessar y.Driving wi
thtire pressu rethat is too high or too
low can:
R Sho rten the service life of the tires.
R Cause increased tire damage. R
Adversely af fect driving characteristics and
th us driving saf ety, e.g. due to hydroplaning. &
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. #
Avoid excessively low tire pressures in
all the tires, including the spare wheel. Ti
re pressure which is too low can cause:
R Tire defects as a result of overheating
R Impaired handling characteristics
R Irre gular wear
R Increased fuel consum ption &
WARNING Risk of accident from exces‐
sive tire pressure
Ti re s with excessively high pressure can
bu rst because 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. #
Avoid excessively high tire pressures in
all the tires, including the spare wheel. Excessively high tire pressure can
result in:
R Increased braking dis tance
R Impaired handling characteristics
R Irre gular wear
R Impaired driving com fort
R Susceptibility todamage 378
Wheels and tires

&
WARNING Risk of accident caused by
re peated drop in tire pressure
If th e tire pressure drops repeatedl y,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. #
Ifyo u are unable torectify the damage,
conta ct aqualified specialist workshop. Yo
u can find information on tire pressure forthe
ve hicle's factor y-ins talled tires on thefo llowing
labels:
R Tire and Loading In form ation placard on the
B‑pillar of your vehicle (→ page 384).
R Tire pressure table on the inside of the fuel
fi ller flap (→ page379).
Obse rveth e maximum tire pressure
(→ page 390). Use a suitable tire pressure
gauge tocheck the
tire pressu re. The ou ter appearance of a tire
does not permit any reliable conclusion about
th e 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 pressure when the tires are
cold. Conditions for cold tires:
R The vehicle has been par ked with the tires
out of direct sunlight for at least thre e hours.
R The 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 pressu re recommended for increased
load/speed in the tire pressure table can af fect
th eride comfort. &
WARNING Risk of accident from unsuita‐
ble accesso ries on the tire valves
If yo u mount unsuitable accessories on totire
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
37 9

The tire pressure
table sho ws there commended
tire pressure for all tires appro vedfo rth is vehi‐
cle. The recommended tire pressures apply for
cold tires under various operating conditions, i.e.
loading and/or speed of theve hicle.
If one or more tire sizes precede a tire pressure,
th e tire pressure information following is only
va lid forth ose tire sizes.
The load conditions "partially laden" and "fully
laden" are defined in theta ble for dif fere nt num‐
be rs of passengers and amounts of luggage. The
actual number of seats may dif fer from this. Some tire pressure
tables only show therim
diame ter ins tead of the comple tetire size, e.g.
R18. The rim diame ter is part of the tire size and
can be found on the tire side wall (→ page 391).
Be sure toalso obse rveth efo llowing fur ther
re lated subjects:
R Notes on tire pressure (→ page377)
R Tire and Loading In form ation placard
(→ page 384) R
Maximum tire pressure (→ page 390) Checking tire pressu
res manually #
Read the tire pressure forth e cur rent operat‐
ing conditions from theTire and Loading
In fo rm ation placard or the tire pressure
ta ble. Obser vethe no tes on tire pressure. #
Remo vetheva lve cap of the tire tobe
ch ecked. #
Press the tire pressure gauge securely on to
th eva lve. #
Read the tire pressure. #
Ifth e tire pressure is lo werth an there com‐
mended value, inc rease the tire pressure to
th ere commended value. #
Ifth e tire pressure is higher than there com‐
mended value, release air. Todo so, press
down the me tal pin in theva lve, e.g. using
th e tip of a pen forex ample. Then check the
tire pressu reagain using the tire pressure
ga uge. #
Screw theva lve cap onto theva lve. 380
Wheels and tires

Fu
rther related subjects:
R Notes on tire pressure (→ page377)
R Tire pressure table (→ page379)
R Tire and Loading In form ation placard
(→ page 384) Ti
re pressure moni toring sy stem Fu
nction of the tire pressure moni toring sys‐
tem &
DANG ER Risk of accident due toincor‐
re ct tire pressure
Every tire, including the spare (if pr ovided),
should be checked when cold at least once a
month and inflated tothe pressure recom‐
mended bytheve hicle manufacturer (see
Ti re and Loading In form ation placard on the
B-pillar on the driver ’sside or the tire pres‐
sure label on the inside of the fuel filler flap
of your vehicle). If your vehicle has tires of a
dif fere nt size than the size indicated on the
Ti re and Loading In form ation placard or the tire pressu
retable, you need todeterm ine
th e proper tire pressure forth ose tires.
As an added saf etyfe ature, your vehicle has
been equipped with a tire pressure monitor‐
ing sy stem (TPMS) that illuminates a low tire
pressure indicator lamp when one or more of
yo ur tires are significantly underinflated.
Ac cording ly, if the low tire pressure indicator
lamp lights up, you should stop and check
yo ur tires as soon as possible, and inflate
th em tothe proper pressure. Driving on a
significant lyunderinflated tire causes the tire
to ov erheat and can lead totire failure.
Un derinflation also increases fuel consump‐
tion and reduces tire tread life, and may
af fect theve hicle's handling and braking abil‐
ity. Please no tethat the TPMS is not a substi‐
tute for proper tire maintenance, and it is the
driver's responsibility tomaintain cor rect tire
pressure, even if underinflation has not
re ached the le velto trig ger illumination of
th e TPMS low tire pressure indicator lamp.
Yo ur vehicle has also been equipped with a
TPMS malfunction indicator toindicate when th
e sy stem is not operating proper ly. The
TPMS malfunction indica tor is combined with
th e low tire pressure indicator lamp. When
th e sy stem de tects a malfunction, the indica‐
to r lamp will flash for appro ximately a minute
and then remain continuously illumina ted.
This sequence will continue upon subsequent
ve hicle start-ups as long as the malfunction
ex ists.
When the malfunction indicator is illumina‐
te d, the sy stem may not be able todetect or
signal low tire pressure as intended. TPMS
malfunctions may occur for a variet y of rea‐
sons, including the ins tallation of incompati‐
ble replacement or alternate tires or wheels
on theve hicle that pr eventthe TPMS from
functioning properly.
Alw aysch eck the TPMS malfunction warning
lamp af terre placing one or more tires or
wheels on your vehicle toensure that the
re placement or alternate tires and wheels
allow the TPMS tocontinue tofunction prop‐
erly. Wheels and tires
381

The sy
stem checks the tire pressure and the tire
te mp erature of the tires ins talled on theve hicle
by means of a tire pressu resensor.
New tire pressure sensors, e.g. in winter tires,
are automatically taught-in during thefirs t jour‐
ney they are used.
If th ere is a subs tantial pressure loss or if the
tire temp erature is excessive, you will be warned
in thefo llowing ways:
R via display messa ges (→ page 450)
R viathe0077 warning lamp in the instrument
clus ter (→ page 474)
The tire pressu remonitoring sy stem is only an
aid. It is the driver's responsibility toset the tire
pressure tothere commended cold tire pressure
suitable forth e operating situation. Set the tire
pressure for cold tires using a tire pressu re
ga uge. Notethat the cor rect tire pressure forthe
cur rent operating situation mu stfirs t be taught-
in to the tire pressure monitoring sy stem.
In most cases, the tire pressure monitoring sys‐
te m will auto maticallyupdate the new refere nce
va lues af teryo u ha vechanged the tire pressure.
Yo u can, ho wever,also update there fere nce val‐ ues
byrestarting the tire pressure monitoring
sy stem manually (→ page 383).
Sy stem limitations
The sy stem may be impaired or may not function
in thefo llowing situations:
R Ifth e tire pressure is set incor rectly
R Ifth ere is a sudden pressure loss caused, for
ex ample, byafo re ign object penetrating the
tire
R Ifth ere is a malfunction caused byano ther
ra dio signal source
Make sure toobser vethefo llowing fur ther rela‐
te d subjec t:
R Notes on tire pressure (→ page377)
Che cking the tire pressure with the tire pres‐
sure moni toring sy stem
Requ irements:
R The ignition is switched on. On-board computer:
, Service .
Tires
One of thefo llowing displa ysappears:
R Cur rent tire pressure of ea chwheel:
R Tire pressure will be displayed after driving a
few minutes
R Tire Pressure Monitor Active: thete ach-in
process of the sy stem is not yet comple te.
The tire pressure are already being moni‐
to re d. #
Compare the tire pressure with there com‐
mended tire pressure forth e cur rent operat‐
ing condition (→ page 379). Obser vethe
no tes on tire temp erature (→ page377).
% The values displa yed in the multifunction dis‐
play may deviate from those of the tire pres‐
sure gauge as they referto sea le vel.At high
altitudes, the tire pressure value indicated by
a pressure gauge are higher than those
shown bythe on-board computer. In this
case, do not reduce the tire pressure. 382
Wheels and tires