2018 MERCEDES-BENZ CLA COUPE tire pressure

If the tire pressures have been set to the lower
values for lighter loadsand/or lowerroad
speeds, the pressures shoul dbereset to the
higher values:
Rif you want to drive with an increased load
and/or
Rif you want to drive at higher speeds
iThe tire pressures for increased loadsa nd/
or higher road speeds, shown in the tire pres-
sure table, may have anegative effect on driv-
ing comfort.
If the tire pressure is not set correctly, this can
leadtoane xcessive build up of heat and asud-
den loss of pressure.
For more information, contact aqualifieds pe-
cialist workshop.
Important notes on tire pressure
GWARNING
If the tire pressure drops repeatedly,t he
wheel,v alve or tire may be damaged. Tire
pressure that is too low may resultinatire
blow-out. There is arisk of an accident.
RCheck the tire for foreign objects.
RCheck whether the wheel is losing air or the
valve is leaking.
If you are unabl etorectify the damage, con-
tact aqualifieds pecialist workshop.
GWARNING
If you fit unsuitable accessorieso nto tire
valves ,the tire valves may be overloaded and
malfunction, which can cause tire pressure
loss. Due to their design, retrofitted tire pres- sure monitors keep the tire valve open. This
can also resultint ire pressure loss. There is a
risk of an accident.
Only screw the standard valve cap or other
valve caps approved by Mercedes-Benz for
you rvehicle onto the tire valve.
Use asuitable pressure gauge to check the tire
pressure. The outer appearance of atire does
not permit any reliable conclusion aboutt he tire
pressure. On vehiclese quipped with the elec-
tronic tire pressure monitor, the tire pressure
can be checked in the on-board computer. The tire temperature and pressure increase
when the vehicle is in motion. This is dependent
on the driving speed and the load.
Therefore, you shoul
donly correct tire pres-
sures when the tires are cold.
The tires are cold:
Rif the vehicle has been parked with the tires
out of direct sunlight for at least three hours
and
Rif the vehicle has been driven less than 1mile
(1.6 km)
The tire temperature changes depending on the
outsidet emperature ,the vehicle speed and the
tire load.Ift he tire temperature changes by
18 ‡(10 †), the tire pressure changes by
approximately 10 kPa (0.1 bar/1.5 psi).T ake
this into account when checking the pressure of
warm tires. Only correct the tire pressure if it is
too low for the current operating conditions. If
you check the tire pressure when the tires are
warm, the resulting valuew illbehigherthan if
the tires were cold. This is normal. Do not
reduce the tire pressure to the values pecified
for cold tires. The tire pressure would otherwise
be too low.
Observe the recommended tire pressures for
cold tires:
Ron the Tire and Loading Information placard
on the B-pillaront he driver's side
Rin the tire pressure table in the fuel fillerf lap
(Ypage 139)
Underinflated or overinflated tires
Underinflated tires
GWARNING
Tires with pressure that is too low can over-
heat and burst as aconsequence. In addition,
they also suffer from excessive and/or irreg-
ularw ear, which can severelyi mpair the brak-
ing propertiesa nd the driving characteristics.
There is arisk of an accident.
Avoid tire pressures that are too low in all the
tires, including the spare wheel.
Underinflated tires may:
Roverheat, leading to tire defects
Radversely affect handling
292Tire pressure
Wheelsa nd tires

Rwear excessively and/or unevenly
Rhave an adverse effect on fuel consumption
Overinflated tires
GWARNING
Tires with excessively high pressure can burst
becaus etheya re damaged moree asily by
road debris,p otholes etc.Inaddition, they
also suffer fromi rregular wear, which can
severely impair th ebraking properties and the
driving characteristics. Thereisar isk of an
accident.
Avoid tir epressures that are too high in all the
tires, including th espare wheel.
Overinflated tires may:
Rincrease th ebraking distance
Radversely affect handling
Rwear excessively and/or unevenly
Rhave an adverse effect on ride comfort
Rbe mores usceptible to damage
Maximumtirep ressures
:Example: maximum permissible tir epres-
sure
Never exceed th emaximum permissible tire
inflatio npressure. Always observe th erecom-
mended tir epressure for your vehicle when
adjustin gthe tirep ressure (
Ypage 290).
iThe actual values for tires are vehicle-spe-
cific and may deviat efromt hevalues in the
illustration.
Checking th etirep ressures
Important safety notes
Observe th enotes on tir epressure
(Ypage 290).
Information on air pressure for th etires on your
vehicle can be found:
Ron th evehicle's Tire and LoadingI nformation
placar dontheB-pillar
Rin th etirep ressure table in th efuel filler flap
(Ypage 139)
Rin th e"Tire pressure" section
Checking tir epressures manually
To determine and set th ecorrectt irep ressure,
proceed as follows:
XRemovet hevalve cap of th etiret hatistob e
checked.
XPresst hetirep ressure gauge securely onto
th ev alve.
XRead th etirep ressure and compare it to the
recommended value on th eTire and Loading
Information placar dorthetirep ressure table
(
Ypage 290).
XIf th etirep ressure is too low, increase th etire
pressure to th erecommended value.
XIf th etirep ressure is too high, releasea ir. To
do so, pressd own themetal pin in th evalve,
using th etip of apen for example. Then check
th et irep ressure again using th etirep ressure
checker.
XScrew th evalve cap ont othe valve.
XRepeat these steps for th eother tires.
Tirep ressurel oss warning system
(Canada only)
General notes
While th evehicle is in motion, th etirep ressure
loss warning system monitors th eset tir epres-
sure using th erotational speed of th ewheels.
This enables th esystem to detect significant
pressure loss in atire. If th espeed of rotation of
aw heel changes as aresult of aloss of pressure,
ac orresponding warning message will appear in
th em ultifunction display.
You can recognize th etirep ressure loss warning
by the Run Flat IndicatorA ctive Press
Tirep ressure293
Wheels and tires
Z

'OK'toRestartmessage in the multifunction
displayint heServ.menu. Information on the
message displayc an be found in the "Restarting
the tire pressure loss warning" section
(
Ypage 294).
Important safety notes
The tire pressure warning system does not warn
you of an incorrectly set tire pressure. Observe
the notes on the recommended tire pressure
(
Ypage 290).
The tire pressure loss warning does not replace
the need to regularly check the tire pressure. An
even loss of pressure on several tires at the
same time cannot be detected by the tire pres-
sure loss warning system.
The tire pressure monitor is not able to warn you
of as udden loss of pressure, e.g. if the tire is
penetrated by aforeign object. In the event of a
sudden loss of pressure, bring the vehicle to a
halt by braking carefully.A void abrupt steering
movements.
The function of the tire pressure loss warning
system is limited or delayed if:
Rsnow chains are mounted on your vehicle's
tires.
Rroad conditions are wintry.
Ryou are driving on sand or gravel.
Ryou adopt avery sporty driving style (corner-
ing at high speeds or driving with high rates of acceleration).
Ryou are driving with aheavy load (in the vehi-
cle or on the roof)
Restarting the tire pressure loss warn-
ing system
Restart the tire pressure loss warning system if you have:
Rchanged the tire pressure
Rchanged the wheels or tires
Rmounted new wheels or tires
XBefore restarting, make sure that the tire
pressures are set properly on all four tires for
the respective operating conditions.
The recommended tire pressure can be found
on the Tire and Loading Information placard
on the B-pillar. Additionally,at ire pressure
table is attached to the fuel filler flap. The tire
pressure loss warning system can only give
reliable warnings if you have set the correct tire pressure. If an incorrect tire pressure is
set, these incorrect valuesw
ill be monitored.
XAlso observe the notes in the section on tire
pressures (Ypage 290).
XMake sure that the SmartKey is in position 2
in the ignition lock (Ypage 122).
XPress =or; on the steering wheel to
select the Serv.menu.
XPress the9or: button to select
Tire Pressure.
XPress the abutton.
The Run Flat Indicator Active Press
'OK' to Restartmessage appears in the
multifunction display.
If you wish to confirm the restart:
XPress the abutton.
The Tire Pressure Now OK?message
appears in the multifunction display.
XPress the 9or: button to select Yes.
XPress theabutton.
The Run Flat Indicator Restartedmes-
sage appears in the multifunction display.
After ateach-in period, the tire pressure loss
warning system will monitor the set tire pres-
sures of all four tires.
If you wish to cancelt he restart:
XPress the%button.
or
XIf the Tire Pressure Now OK?message
appears, press the 9or: button to
select Cancel
.
XPress the abutton.
The tire pressure valuess tored at the last
restart will continue to be monitored.
Tire pressure monitor (Canada only)
General notes
If at ire pressure monitor is installed, the vehi-
cle's wheels have sensors that monitor the tire
pressures in all four tires. The tire pressure mon-
itor warns you if the pressure drops in one or
more of the tires. The tire pressure monitor only
functions if the corresponding sensors are
installed in all wheels.
Information on tire pressures is displayed in the
multifunction display. After afew minutes of
driving, the current tire pressure of each tire is
294Tire pressure
Wheels and tires

shown in theServ.menu of the multifunction
display, see illustration (example).
For information on the message display, refer to
the "Checking the tire pressure electronically"
section (
Ypage 296).
Important safety notes
GWARNING
Each tire, including the spare (if provided),
should be checked at least once every two
weeks when cold and inflated to the pressure recommended by the vehicle manufacturer
on the Tire and Loading Information placard
on the driver's door B-pillar or the tire pres-
sure label on the inside of the fuel filler flap. If
your vehicle has tires of adifferent size than
the size indicated on the Tire and Loading
Information placard or, if available, the tire
pressure label,y ou should determine the
proper tire pressure for those tires.
As an added safety feature, your vehicle has
been equipped with atire pressure monitoring
system (TPMS) that illuminates alow tire pres-
sure telltale when one or more of your tires
are significantly underinflated. Accordingly,
when the low tire pressure telltale lights up,
you should stop and check your tires as soon
as possible,a nd inflate them to the proper
pressure. Driving on asignificantly underin-
flated tire causes the tire to overheat and can
lead to tire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehicle's
handling and stopping ability. Please note that the TPMS is not asubstitute for proper tire
maintenance, and it is the driver's responsi-
bility to maintain correct tire pressure, even if
underinflation has not reached the level to
trigger illumination of the TPMS low tire pres- sure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate when
the system is not operating properly. The
TPMS malfunction indicator is combined with
the low tire pressure telltale. When the sys-
tem detects amalfunction, the warning lamp
will flash for approximately aminute and then
remain continuously illuminated. This
sequence will be repeated every time the vehi-
cle is started as long as the malfunction
exists. When the malfunction indicator is illu-
minated, the system may not be able to detect
or signal low tire pressure as intended.
TPMS malfunctions may occur for avariety of
reasons, including the installation of incom-
patible replacement or alternate tires or
wheels on the vehicle that prevent the TPMS
from functioningp roperly. Always check the
TPMS malfunction telltale after replacing one
or more tires or wheels on your vehicle to
ensure that the replacement or alternate Tires
and wheels allow the TPMS to continue to
function properly.
It is the driver's responsibility to set the tire
pressure to that recommended for cold tires
which is suitable for the operating situation
(
Ypage 290). Note that the correct tire pressure
for the current operating situation must first be
taught-in to the tire pressure monitor. If asub-
stantial loss of pressure occurs, the warning
threshold for the warning message is aligned to
the taught-in reference values. Restart the tire
pressure monitor after adjusting the pressure of
the cold tires (
Ypage 297). The current pres-
sures are saved as new reference values. As a
result, awarning message will appearift he tire
pressure drops significantly.
The tire pressure monitor does not warn you of
an incorrectly set tire pressure. Observe the
notes on the recommended tire pressure
(
Ypage 290).
The tire pressure monitor is not able to warn you
of as udden loss of pressure, e.g. if the tire is
penetrated by aforeign object. In the event of a
sudden loss of pressure, bring the vehicle to a
halt by braking carefully.A void abrupt steering
movements.
Tire pressure295
Wheels and tires
Z

The tire pressure monitor hasayellow warning
lamp in the instrument cluster for indicating
pressure loss or amalfunction. Whether the
warning lamp flashes or lights up indicates
whether atire pressure is too low or the tire
pressure monitor is malfunctioning:
Rif the warning lamp is lit continuously, the tire
pressure on one or more tires is significantly
too low. The tire pressure monitor is not mal- functioning.
Rif the warning lamp flashes for around a
minute and then remains lit constantly, the
tire pressure monitor is malfunctioning.
In addition to the warning lamp, amessage
appears in the multifunction display.O bserve
the information on display messages
(
Ypage 211).
It may take up to ten minutes for amalfunction
of the tire pressure monitor to be indicated. A
malfunction will be indicated by the tire pres-
sure warning lamp flashing for approximately
one minute and then remaining lit. When the
malfunction has been rectified, the tire pressure
warning lamp goes out after afew minutes of
driving.
The tire pressure values indicated by the on-
board computer may differ from those meas-
ured at agas station with apressure gauge. The
tire pressures shown by the on-board computer
refer to those measured at sea level. At high
altitudes, the tire pressure values indicated by a
pressure gauge are higher than those shown by the on-board computer. In this case, do not
reduce the tire pressures.
The operation of the tire pressure monitor can
be affected by interferenc efrom radio transmit-
ting equipment (e.g. radio headphones, two-way
radios) that may be being operated in or near the vehicle.
Checking the tire pressur eelectroni-
cally
XMake sure that the SmartKey is in position 2
in the ignition lock (Ypage 122).
XPress =or; on the steerin gwheel to
select the Serv.menu.
XPress the9or: button to select
Tire Pressure.
XPress the abutton.
The current tire pressure of each tire is shown
in the multifunction display. If the vehicle was parked for longer than
20 minutes, the
Tire pressure will be
displayed after driving afew minutesmessage is shown.
After ateach-in process, the tire pressure mon-
itor automatically detect snew wheels or new
sensors. As long as aclear allocation of the tire
pressure value to the individual wheels is not
possible, the Tire
PressureMonitorActivemessage is shown instead of the tire pressure
display.The tire pressures are already being
monitored.
If an emergencys pare wheel is mounted, the
system may continue to show the tire pressure
of the wheel that has been removed for afew
minutes. If this occurs, notet hat the value dis-
played for the position where the spare wheel is
mounted is not the same as the current tire
pressure of the emergencys pare wheel.
Tire pressuremonitor warning mes-
sages
If the tire pressure monitor detect sapressure
loss in one or more tires, awarning message is
shown in the multifunction display.T he yellow
tire pressure warning lamp then lights up.
RIf the Please Correct Tire Pressuremessage appears in the multifunction display,
the tire pressure in at least one tire is too low.
The tire pressure must be corrected when the
opportunit yarises.
RIf the Check Tire Pressuremessage
appears in the multifunction display,t he tire
pressure in one or more tires has dropped
significantly. The tires must be checked.
RIf the TirePressureWarningTireFail‐uremessage appears, the tire pressure in one
or more tires has dropped suddenly. The tires
must be checked.
Observe the instructions and safety notes in the
display messages in the "Tires" section
(
Ypage 211).
If the wheel positions on the vehicle are rotated,
the tire pressures may be displayed for the
wrong positions for ashort time. This is rectified
after afew minutes of driving, and the tire pres-
sures are displayed for the correctp ositions.
296Tirepressure
Wheels and tires

Restarting the tire pressure monitor
Whenyourestart the tire pressure monitor, all
existing warning messages are deleted and the
warning lamps go out. The monitor uses the cur-
rentlys et tire pressures as the reference values
for monitoring. In most cases, the tire pressure
monitor will automaticall ydetect the new refer-
ence value safteryou have changed the tire
pressure. However, yo ucan also set reference
value smanually as described here. The tire
pressure monitor then monitors the new tire
pressure values.
XSet the tire pressure to the value recommen-
ded for the corresponding driving situation on
the Tire and Loading Information placard on
the driver'ss ideB -pillar (
Ypage 290).
Yo uc an find more tire pressure value sfor
various operating conditions in the tire pres-
sure table inside the fue lfille rflap
(
Ypage 139).
XMake sure that the tire pressure is correct on
al lf ourw heels.
XMake sure that the SmartKey is in position 2
in the ignition lock (Ypage 122).
XPress =or; on the steering wheel to
select the Serv.menu.
XPress the9or: button to select
Tire Pressure.
XPress the abutton.
The multifunction display shows the current
tire pressure for each tire or the Tire pres‐
surewillbedisplayedafterdrivingafew minutesmessage.
XPress the :button.
The multifunction display shows the Use
Current PressuresasNew ReferenceValuesmessage.
If you wish to confirm the restart:
XPress the abutton.
The TirePress.MonitorRestartedmes-
sage appears in the multifunction display.
After driving for afew minutes, the system
checks whethert he current tire pressures are
within the specified range. The new tire pres-
sures are then accepted as reference values
and monitored.
If you wish to cance lthe restart:
XPress the %button.
The tire pressure value sstoredatt he last
restart will continu etobemonitored.
Radio type approval for the tire pres-
sure monitor
CountryRadio type approval number
USAFCC ID: MRXMW2433A
FCCIC ID:MRXGG4 Thisd evice
complies with part 15 of the FCC
rules and with license exempt
RSS standard sofIndustry Can-
ada. Operation is subject to the
following conditions .(1) This
device may not cause harmful
interference, and (2) Thisd evice
mus taccept any interference
received, including interference
that may cause undesired oper-
ation. Le present appareile st
conforme d'industrieC anada
applicables au xappereils radio
exempts de licence. L'exploita-
tion est authorisee au xdeuxc on-
ditions suivantes. (1) .L'appareil
ne doi tpas produire de brouil-
lage, et (2) L'autisatue rdel'ap-
pareild oita ccepter toutb rouil-
lage radioelectriqu esubi, meme
si le brouillag eest susceptible
d'e ncompromettre le fonc-
tionnement. WARNING:C hanges
or modifications not expressively
approved by the party responsi-
bl ef or compliance could voidt he
users authority to operate the
equipment. The term "IC:" before the radio certification number
only signifies Canad atechnical
specifications were met.
FCC ID:MRXMC34MA4 This
device complies with part 15 of
the FCC rules and with license
exempt RSS standard sofIndus-
try Canada. Operation is subject
to the following conditions .(1)
Thisd evice may not cause harm-
ful interference, and (2) This
device mus taccept any interfer-
ence receive d, i
ncluding interfer-
ence that may cause undesired
operation. Le present appareil
est conforme d'industrieC anada
applicables au xappereils radio
exempts de license .L'exploita-
tion est authorisee au xdeuxc on-
ditions suivantes. (1) .L'appareil
Tire pressure297
Wheel sand tires
Z

CountryRadio type approval number
ne doit pas produire de brouil-
lage, et (2) L'autisatuer de l'ap-
pareil doit accepter tout brouil-
lage radioelectrique subi, meme
si le brouillage est susceptible
d'en compromettre le fonc-
tionnement. WARNING: Changes
or modifications not expressively
approved by thepartyr esponsi-
ble for compliance could void the
users authorityt ooperate the
equipment .The ter m"IC:"b efore
th er adio certification number
onl ysignifies Canada technical
specifications were met.
CanadaIC: 2546A-MW2433A
IC:2546A-GG4 This devic ecom-
plies with part 15 of th eFCC
rules and with licens eexempt
RSS standards of Industry Can-
ada. Operatio nissubject to the
following conditions. (1) This
devic emay not cause harmful
interference, and (2) This device
must accept any interference
received ,includingi nterference
that may cause undesiredo per-
ation. Le present appareil est
conforme d'industrie Canada
applicables aux appereils radio
exemptsdel icense. L'exploita-
tio ne st authorisee aux deux con-
ditionss uivantes.(1). L'appareil
ne doit pas produire de brouil-
lage, et (2) L'autisatuer de l'ap-
pareil doit accepter tout brouil-
lage radioelectrique subi, meme
si le brouillage est susceptible
d'en compromettre le fonc-
tionnement. WARNING: Changes
or modifications not expressively
approved by th epartyr esponsi-
ble for compliance could void the
users authorityt ooperate the
equipment .The ter m"IC:"b efore
th er adio certification number
onl ysignifies Canada technical
specifications were met.
IC: 2546A-MC34MA4
Loading th evehicle
Instruction labels for tires and loads
GWARNING
Overloadedt ires can overheat,c ausing a
blowout.O verloadedt ires can also impair the
steeringa nd driving characteristic sand lead
to brakef ailure. Thereisar isk of accident.
Observe th eload rating of th etires. The load
rating must be at least half of th eGAWR of
your vehicle .Never overload th etires by
exceedingt hemaximum load.
Two instruction labels on your vehicle show the maximum possible load.
(1) The Tire and LoadingI nformation placar dis
on th eB-pillar on th edriver' sside. The Tire
and LoadingI nformation placar dshows the
maximum permissible number of occu-
pant sand th emaximum permissible vehicle
load. It also contain sdetails of th etires izes
and corresponding pressures for tires
mounted at th efactory.
(2) The vehicle identification plateisont heB-
pillar on th edriver' sside. The vehicle iden-
tification platei nformsyou of thegross
vehicle weight rating .Itismade up of the
vehicle weight,a ll vehicle occupants, the
fuel and th ecargo. You can also fin dinfor-
mation about th emaximum gross axle
weight rating on th efront and rear axle.
The maximum gross axle weight rating is
th em aximum weight that can be carried by
one axle (front or rear axle) .Never exceed
th em aximum load or th emaximum gross
axle weight rating for th efront or rear axle.
:B-pillar ,driver' sside
298Loading th evehicle
Wheels and tires

Observe the legally required minimum tire tread
depth (Ypage 288). Winter tires can reduce the
braking distance on snow-covered surfaces in
comparison with summer tires. The braking dis-
tance is still much further than on surfaces that
are not icy or covered with snow. Take appro-
priate care when driving.
Further information on winter tires (M+S tires)
(
Ypage 289).
Temperature
GWARNING
The temperature grade for this tire is estab-
lished for atire that is properly inflated and
not overloaded.E xcessive speed, underinfla-
tion, or excessive loading, either separately or
in combination, can cause excessive heat
build-up and possible tire failure.
The temperature grades are A(the highest), B,
and C, representing the tire's resistance to the
generation of heat and its ability to dissipate
heat when tested under controlled conditions
on aspecified indoor laboratory test wheel. Sus-
tained high temperature can cause the material
of the tire to degenerate and reduce tire life, and
excessive temperature can lead to sudden tire
failure. The grade Ccorresponds to alevel of
performance which all passenger car tires must
meet under the Federal Motor Vehicle Safety
Standard No. 109. Grades BandArepresent
higher levels of performance on the laboratory
test wheel than the minimum required by law.
Tire labeling
Overview
:Uniform Tire Quality Grading Standards
(Ypage 306)
;Department of Transportation, Tire Identifi-
cation Number (Ypage 305)
=Maximum load rating (Ypage 304)
?Maximum tire pressures (Ypage 293)
AManufacturer
BTire material (Ypage 305)
CTire size designation, load-bearing capacity
and speed rating (Ypage 302)
DLoad index (Ypage 304)
ETire name
The markings described above are on the tire in
addition to the tire name (sales designation) and
the manufacturer's name.
iTire data is vehicle-specific and may deviate
from the data in the example.
Tire size designation, load-bearing
capacity and speed rating
GWARNING
Exceeding the stated tire load-bearing capa-
city and the approved maximum speed could
lead to tire damage or the tire bursting. There is ar isk of accident.
Therefore, only use tire types and sizes
approved for your vehicle model. Observe the
302All about wheels and tires
Wheels and tires