2011 MERCEDES-BENZ M-CLASS SUV tyre pressure

Usefu
linfor mati on
i This Owner's Manual describes all models
and all standard and optional equipment
available to your vehicle at the time of pub-
lication of the Owner's Manual. Country-
specific deviation sare possible .Please
not ethat your vehicle ma ynot be equipped
with all featur es described. This also
applies to safety-releva ntsystems and
functions.
i Please read the information on qualified
specialist workshops (Y page 24).Important safet
ynotes G
WARNING
Tyres, wheels or accessories whic hhaven ot
been approved by Mercedes- Benz foryour
vehicle or are not used as they should be, can
impair driving safety. As aresult, you could
cause an accident .Befor epurchasing and
using them, enquire about their suitability,
legal stipulations and factory recommenda-
tions at aMercedes-Benz Ser vice Centre.
Modificatio nwork on the brake system and
wheels is not permitted, nor is the use of
spacer plate sorbrake dust shields. This inva-
lidates th eGeneral Operatin gPermit for the
vehicle.
i Further information about tyres and
wheels can be obtained from any
Mercedes-Benz Ser vice Centre. Oper
ation Notes on driving
R While driving, pay attention to vibrations,
noises and unusual handling characteris-
tics ,e.g. pulling to one side. This may indi-
cate that the wheels or tyres are damaged.
If you suspect that atyre is defective,
reduce your speed immediately. Stop the vehicle as soo
naspossible to chec kthe
wheels and tyres for damage. Hidden tyre
damage could also be causing the unusual
handling characteristics. If you fin dno
signs of damage, hav ethe wheels and tyres
examined at aqualified specialist work-
shop, e.g. aMercedes-Ben zService
Cent re.
R When parkin gyour vehicle, make sure that
the tyres do not get deformed by the kerb
or other obstacles. If it is necessary to drive
over kerbs, speed humps or similar eleva-
tions, tr ytodosos lowly and at an obtuse
angle. Otherwise, the tyres, particularly the
sidewalls, can get damaged. Notes on regularly inspecting wheels
and tyres
R Regularly chec kthe wheels and tyres of
your vehicle for damage (e.g. cuts, punctu-
res, tears, bulges on tyres and deformation,
crack sorseverecorrosion on wheels), at
least ever y14d ays, as well as after driving
off-road or on rough roads. Damaged
wheels can cause aloss of tyr epressure.
R Regu larly check th etyre tread depth and
the conditio nofthe tread across the whole
widt hofthe tyr e(Ypage 357). If neces-
sary, tur nthe front wheels to full lock in
orde rtoi nspect the inner sid eofthe tyre
surface.
R All wheels must hav eavalve cap to protect
the valve against dirt and moisture. Do not
fit anything onto the valve (such as tyre
pressure monitorin gsystems) othe rthan
the standar dvalve cap or other valve caps
approved by Mercedes-Ben zfor your vehi-
cle.
R Regularly chec kthe pressur eofall the tyres
including the emergenc yspare wheel or the
spare wheel, particularly prior to long trips,
and correc tthe pressur easnecessary
(Y page 359). 356
OperationWheels and tyres

Tyre tread
G
WARNING
Bea rinm ind that:
R tyre gri pdecrease srapidly on wetroads
when the tread depth is less than 3mm.
Thus ,you should repl acet yres that have
insufficient tread.
R winter tyres sho uld bereplaced when the
trea ddepth is 4mmorl ess as they no lon-
ger provide adequat egrip.
R thet rea donat yre may not wear evenly.
Thus ,you should regularly chec kthe tread
depth and the condition of the tread across
the entire widt hofall tyres. If necessary,
turn the fron twheels to full lock in order to
inspec tthe tyr etrea dm ore easily.
Otherwise, you coul dlose control of the vehi-
cle and cause an accident due to the reduced
grip of the tyres on the road. Note
sons electing, fitting and replac-
ing tyres
R Only fit tyres and wheels of the same type
and make.
R Only fit tyres of the correct size onto the
wheels.
R After fittin gnew tyres, run them in at mod-
erat espeeds for the first 10 0km, as they
onl yreach their ful lperformanc eafter this
distance.
R Do not drive wit htyres which have too little
tread depth ,asthis significantly reduces
the traction on wet roads (aquaplaning).
R Replace the tyres after six year satthe lat-
est, regardless of wear .This also applies to
the emergency spar ewheel/spar ewheel. MOExtended ty
res( tyres with run-flat
characteristics)
MOExtended tyres (tyres with run-flat char-
acteristics) allo wyou to continue drivin gthe vehicle even when one or mor
etyres los eall
air pressure.
MOExtended tyres may only be used in con-
junction with the tyre pressure loss warning
system or with the tyre pressure monitor and
on wheels specifically tested by Mercedes-
Benz.
i Vehicles with MOExtended tyres are not
equipped with aTIREFIT kit at th efactory.
It is therefore recommended that you addi-
tionally equip your vehicle with the TIREFIT
kit if you fit tyres that do not feature run-
flat properties, e.g. winter tyres. ATIREFIT
kit can be obtaine dfrom aMercedes-Benz
Ser vice Centre.
Notes on driving with MOExtended tyres in
the event of aflat tyre can be found in the
"Breakdown assistance" section
(Y page 342). Winter operation
Points to remember
At the onset of winter ,have your vehicle win-
terproofed at aqualified specialist workshop,
e.g. at aMercedes-Ben zService Cent re.
Observe the notes in the "Changin gawheel"
section (Y page 363). Drivin
gwith summer ty res
At temperatures below +7 †, summer tyres
los ee lasticit yand therefore traction and
braking power; chang ethe tyres on your vehi-
cle to M+S tyres .Using summer tyres at very
cold temperatures could cause tears to form,
thereby damagin gthe tyres permanently.
Mercedes-Ben zcannot accept responsibility
for this type of damage. Winter operation
357Wheels andtyres Z

M+S tyres
At temperature sbelo w+ 7† ,use winter tyres
or all-season tyres .Both types of tyr eare
identified by th eM+S marking.
Onl ywinter tyres bearing the isnowflake
symbol in addition to the M+S marking pro-
vide the best possible grip in wintr yroad con-
ditions. Only these tyres will allow driving
safet ysystems such as ABS and ESP ®
to
function optimally in winter, as thes etyres
have been designed specifically for driving on
snow.
Use M+S tyres of the same make and tread
on all wheels to maintain safe handling char-
acteristics. G
WARNING
M+S tyres with atrea ddepth of less than
4mmm ust be replaced. They are no longer
suitable for winter use and can no longer pro-
vide sufficien tgrip. This could cause you to
lose control of your vehicle and cause an acci-
dent.
Always observe the maximum permissible
speed specified for the M+S tyres you have
fitted.
If you fit M+S tyres which have alower max-
imu mpermissible speed than that of the vehi-
cle, affix an appropriate warning sign in the
driver' sfield of vision. This can be obtained
at aq ualified specialist workshop, e.g. at a
Mercedes-Ben zService Centre.
Under these circumstances, you should also
restrict the maximu mspeed of the vehicle
using permanent SPEEDTRONIC so that it
does not exceed the maximum permissible
speed for the M+S tyres(Y page 174).
When you have fitted the M+S tyres:
X Check the tyr epressures (Y page 359).
X Restart th etyre pressure los swarning sys-
tem (Y page 360). G
WARNING
If you fit the spare wheel when driving with M
+S tyres, bear in mind that driving stability will be impaired due to unstable cornerin
gchar-
acteristic scaused by the different tyres. You
shoul dtherefore adapt your drivin gstyle and
drive carefully.
Have the spare whee lreplaced at the nearest
qualified specialist workshop which has the
necessar yspecialist knowledge and tools to
carry out the work required. Mercedes-Benz
recommends that you use aMercedes-Benz
Ser vice Centre for thi spurpose. In particular,
work relevant to safety or on safety-related
systems must be carried out at aqualified
specialist workshop. Snow chains
For safety reasons ,Mercedes-Benz recom-
mends that you only use snow chain sthat
hav ebeen specially approved for your vehicle
by Mercedes-Benz ,orthat ar eofac orre-
spondin gstandard of quality.
! Vehicle swith the ON&OFFROAD package
or the AIRMATIC package: do not drive in
ADS SPORT mode when drivin gwith snow
chains fitted.
If you intend to fit snow chains, please bear
the following point sinmind:
R it is not permissible to attac hsnow chains
to all wheel-tyre combinations ;see the
information under "Wheel/tyre combina-
tion s"int he "Wheels and tyres" section.
R snow chains must not be fit tedtoe mer-
gency spare wheels ,e.g. a"Minispare"
emergency spar ewheel.
R fit snow chains only in pair sand only to the
rear wheels .Observ ethe manufacturer's
installation instructions.
! Vehicle swith steel wheels: if you wish
to fit snow chains to steel wheels, make
sure that you remove the respective
wheels' hubcaps first .The hubcaps may
otherwise be damaged. 358
Winter operationWheels and tyres

On vehicle
swith the AIRMATIC package, you
must drive at raised vehicle level if snow
chains have been fitted (Y page 188).
Do not exceed the maximum permissible
speed of 50 km/h.
i You may wish to deactivate
ESP ®
(Y page 63) when pulling away with
snow chains fitted. This way you can allow
the wheels to spin in acontrolled manner,
achievin ganincrease ddriving force (cut-
tin ga ction). Tyre pressure
Tyre pressure specifications
You wil lfind atable of tyre pressures for var-
ious operating conditions on the inside of
your vehicle's fuel filler flap.
Operation with emergency spare wheel:
the applicable value for the emergency spare
wheel is stated on the spare wheel and in the
technical data section.
Operation with atrailer: the applicable
value for the rear tyres is the maximum tyre
pressure value stated on the table insid ethe
fuel filler flap.
The tabl einsid ethe fuel filler fla pmay state
tyre pressures for different load conditions.
Thes eare define dinthe tabl easdifferent
number sofpassengers and amounts of lug-
gage. The actual number of seats may vary –
for more information, please refer to the vehi-
cle's registration documents.
If no other data is stated, the tyre pressures
specified on the fuel filler flap appl yfor all
tyres approved for this vehicle. If
at yre size precede satyre pressure, the tyre
pressure information following is only valid
for that tyre size. G
WARNING
Tyre pressure that is eithe rtoo high or too low
has anegativ eeffect on the vehicle's driving
safety ,which coul dlead you to cause an acci-
dent. Therefore, you should regularly check
the pressur eofall the tyres, particularly prior
to long trips, and correct the pressure as nec-
essary.
To test tyre pressure, use asuitabl epressure
gaug e. Th eouter appearance of atyre does
not permit any reliabl econclusion about the
tyr ep ressure. On vehicles fitted wit hthe elec-
tronic tyr epressure monitor, th etyre pres-
sure can be checked using the on-board com-
puter. G
WARNING
Do not fit anything else to the tyre valve other
than the standard valve cap. In particular, ret-
rofitted tyre pressure monitors which are
screwed on to the valve may overload it and
cause it to fail. Due to their design, the valve
is kept open continuousl y, whichmay lead to
air loss. Tyr
epressure
359Wheels and tyres Z

G
WARNING
Shoul dthe tyr epressure dro prepeatedly:
R check the tyr efor foreign bodies.
R check whether the wheel is losing air or the
valve is leaking.
R make sure that only avalve cap approved
by Mercedes-Benz is fitted on the tyre
valve.
Tyre pressures that are too low have anega-
tiv ee ffect on vehicl esafety, which could lead
you to cause an accident.
If possible, only correc ttyre pressures when
the tyres are cold.
The tyres are cold:
R if the vehicl ehas been parked wit hthe tyres
out of direc tsunlight for at least three
hours and
R if the vehicle has not been driven further
than 1. 6km
Depe nding on the ambient temperature, the
speed you are drivin gatand the load on the
tyres, the tyre temperature and thus the tyre
pressure may chang ebyapproximately
10 kPa (0. 1bar/1 .5psi) per 10 †. Take this
int oa ccount whe nchecking the pressur eof
warm tyres and only correc titifitist oo low
for the curren toperating conditions.
Drivin gwith tyre pressure that is too high or
too low can:
R shorten the servic elife of the tyres
R cause increased tyre damage
R have anegativ eeffect on handling charac-
teristics and thus th edriving safet y(e.g. by
causin gaquaplaning)
i The tyr epressure values given for low
load sare minimum values which offe ryou
good rid ecomfort characteristics.
However, you can also use the values given
for higher loads. These ar epermissible and
will not adversely affect the running of the
vehicle. H
Environmenta
lnote
Check the tyre pressure regularly, at least
every 14 days.
You will find information on tyre pressures for
the vehicle's factory-mounted tyres on the
plates described here. Tyr
epressure loss warning system
Important safety notes Whil
ethe vehicle is in motion, the tyr epres-
sure loss warning system monitors th eset
tyr ep ressure using th erotational speed of
the wheels. This enables the system to detect
significant pressure loss in atyre. If the speed
of rotation of awheel changes as aresult of
al oss of pressure, acorrespondin gwarning
message will appea rinthe multifunction dis-
play. G
WARNING
The tyr epressure loss warning system does
not warn you of an incorrectly se ttyre pres-
sure. The table on the insid eofthe fuel filler
fla pw ill help you decide whether the tyre
pressures should be corrected.
The tyre pressure loss warnin gsystem does
not replace the need to regularly check your
vehicle's tyre pressures, since an even loss of
pressure on several tyres at the same time
cannot be detecte dbythe tyr epressure loss
warning system.
Th et yre pressure monitor is not able to warn
you of asudden loss of pressure, e.g. if the
tyre is penetrated by aforeign objec t.
In the event of asudden loss of pressure, bring
the vehicle to ahalt by braking carefully. Do
not make any sudden steering movements
when doing so.
The function of the tyre pressure loss warning
system is limited or delayed if:
R snow chains are fitted to your vehicle's
tyres.
R road conditions are wintry. 360
Tyr
epressureWheels and tyres

R
you are drivin gonsandorg ravel.
R yo ua dopt averys porty driv ings tyle (cor-
nering at hig hspeeds or driv ingw ith high
rates of acceleration).
R you are towing avery heavy or lar getrailer.
R you are driving with aheavy load (in the
vehic le oron the roof).
Restarting th etyre pressure lo sswarn-
ing system Restart the tyre press
urel oss warnin gsystem
if you have:
R changed the tyre press ure
R changed the whe elso rtyres
R fitted new wheels or tyres
X Before restarting, consult the table of tyre
press ures on the inside of the fuel filler flap
to ensur ethat the tyr epressure in all four
tyre siss et correctly for the respective
operating conditions.
X Observ ethe notes in the section on tyre
pressures (Y page 359). G
WARNING
The tyr epressure loss warn ings ystem can
only give reliabl ewarnings if you have set the
correct tyre pressure.
If an incorrect tyre pressure is set, these
incorrect values wil lbemonitored.
At yre with insufficient pressure results in
vehicle instability when driving, thu sincreas-
ing the risk of an accident.
X Make sure that the key is in pos i-
tion 2(Ypage139) in the igniti onlock.
X Press =or; on the steering wheel
to select the Serv. menu.
X Press 9or: to select Tyre pres‐ sure .
X Press the abutton.
The RunF lat Indicato ractive Restart with OK message ap
pears in the
multifunction display. If you wis
htoconfirm the restart:
X Press the abutton.
The Tyre press. no wOK? message
ap pe ars in the multifunction display.
X Press the 9or: button to select
Yes .
X Press the abutton.
The RunF lat Indicato rrestarted message ap
pears in the multifunction dis-
play.
After ateach-in period, the tyr epressure
loss warn ings ystem wil lmonitor the set
tyr ep ressures of all fou rtyres.
If you wis htocancel the restart:
X Press the %button.
or
X If the Tyre press. now OK? message
appears ,press 9 or: to select
Cancel .
X Press the abutton.
Th et yre press urev alues stored at the last
restart wil lcontinue to be monitored. Tyre pressur
emonitor
Important safety notes If
at yre press urem onitor system is fitted, the
vehicle's wheels have sensor sfitted that
monitor the tyre pressures in all four tyres.
The tyre pressure monitor warns you when
the pressure drops in one or more of the
tyres. The tyre pressure monitor only func-
tions if the correct sensors are fitted to all
wheels. G
WARNING
The tyre pressure monitor does not warn you
of an incorrectly set tyre pressure. The table
on the inside of the fuel filler flap wil lhelp you
decide whether the tyre pressures should be
correc ted.
The tyr epressure monitor is not abl etow arn
you of asudden loss of pressure, e.g. if the Tyr
epressure
361Wheels and tyres
Z

tyre is penetrated by
aforeign object .Inthe
event of asudden loss of pressure, bring the
vehicl etoah altbyb rakingcarefully. Do not
make any sudden steering movements when
doing so.
Informatio nontyre pressures is displayed in
the multifunction display. After afew minutes
of driv ing, the curren ttyre pressure of each
tyre is sho wn inthe multifunction display.
i Thet yre pressure values indicated by the
on-board computer may differ from those
measured at afilling station with apressure
gauge. Th etyre pressures shown by the on-
board computer refer to thos emeasured at
sea level. At high altitudes, the tyr epres-
sure values indicated by apressure gauge
are higher than thos eshown by the on-
boar dcomputer .Inthis case ,donot reduce
the tyr epressures.
i Theo peration of the tyr epressure moni-
to rc an be affected by interference from
radio transmitting equipment (e.g. radio
headphones ,two-way radios) that may be
being operated in or near the vehicle.
Checking tyr epressure electronically X
Make sure that the key is in position 2
(Y page 139) in the ignitio nlock.
X Press the =or; button on the steer-
ing wheel to select the Serv. menu.
X Press the 9or: button to select
Tyre pressure .
X Press the abutton.
The curren ttyre pressure for each wheel
will be displayed in the multifunction dis-
play.
If the vehicle has been parked for longe rthan
20 minutes, the Tyre pressures will be
displaye
dafter afew minutes of driving message appe
ars.
After ateach-in period, the tyr epressure
monito rautomatically recognise snew
wheels or new sensors. As long as aclear
allocation of the tyre pressure values to the individual wheels is not possible
,the Tyre pressure monito
ractive displa
ymes-
sage is shown instead of the tyr epressure
display. Th etyre pressures are already being
monitored.
i Ifas pare wheel/emergenc yspare wheel
is fitted, the system may continue to show
the tyr epressure of th ewheel that has
been removed for afew minutes. If this
occurs, note that the value displayed for
the position where the spare wheel/emer-
gency spare wheel is fitted is not the same
as the spare wheel/emergenc yspare
wheel's current tyr epressure.
Tyre pressure monito rwarning mes-
sages If the tyre pressure monitor detects
asignifi-
cant pressure loss on one or more tyres, a
warnin gmessage is shown in the multifunc-
tion display. Awarning ton ealso sounds and
th et yrep ressure warning lamp ligh tsup in
the instrumen tcluster.
Eac htyret hat is affected by asignificant loss
of pressure is highlighted in th epressure dis-
play.
If the Please correc ttyrep ressure messag
eappear sinthe multifunctio ndis-
play:
X Chec kthe tyr epressure on all fou rwheels
and correc titifn ecessary.
i If the wheel positions on the vehicle are
inter changed, the tyre pressures may be
displ ayed for th ewrong positions for a
short time .This is rectified after afew
minutes of driving, and the tyr epressures
are displayed for th ecorrect positions.
Restarting th etyre pressure monitor When yo
urestar tthe tyr epressure monitor,
all existing warning message sare deleted and
th ew arning lamps go out. The monitor uses
the currently set tyre pressures as the refer-
ence values for monitoring. In most cases, the
tyre pressure monitor will automatically 362
Tyr
epressureWheels and tyres

detec
tthe new referen ce values after you
have changed th etyrep ressure.
i For an overview of the menus, see
(Y pag e238).
If you wis htodefinethe new reference values
manually:
X Use the tabl eonthe insid eofthe fuel filler
fla ptoe nsure that the tyre pressure is set
correctly in all four tyres for the current
operating conditions.
Also observe the notes in the section on
tyre pressures (Y page359).
X Make sure tha tthe key is in position 2in
the ignition lock.
X Press the =or; button on the steer-
ing wheel to selec tthe Service menu.
X Press the 9or: button to select
Tyre pressu re .
X Press the abutton.
The multifunction display shows the cur-
ren ttyre pressure of the individual tyres or
the Tyrepressures will be dis‐ played after a few minutes of driv‐
ing message.
X Press the :button.
The Usec urrent pressures as new reference values message appears in
th em ultifunction display.
If you wish to confirm the restart:
X Press the abutton.
The Tyre press. monito rrestarted message appears in th
emultifunction dis-
play.
After you have driven for afew minutes, the
system checks whether the curren ttyre
pressures are within the specified range.
The new tyre pressures are then accepted
as reference values and monitored.
If you wish to cancel the restart:
X Press the %button.
The tyre pressure values stored at the last
restart will continue to be monitored. Radio typ
eapproval for the tyr epres-
sur em onitor In certain countries,
aradio type approval for
the tyre pressure monitor may be required.
The radio type approval number for the tyre
pressure monitor can be found online at:
http://www.mercedes-benz.de/
betriebsanleitung. Changing
awheel Flat tyre
Th e" Breakdown ass istance" section
(Y pag e334) contain sinformation and notes
on how to dea lwith aflat tyre. It also provides
instructions on changing awhee lorf itting the
spar ewhee lore mergency spar ewheel. Interch
angin gthe wheels G
WARNING
Interchange th efront and rea rwheels only if
they hav ethe sam edimensions :for example
size, offset ,etc.
After every whee linterchange/change, have
the tightening torque checked at aqualified
specialist workshop that has the necessary
specialist knowledg eand tool stocarry out
the work required. Mercedes-Benz recom-
mends that you use aMercedes-Benz Service
Centr efor this purpose. In particular ,work
relevant to safet yoronsafety-related sys-
tems must be carried out at aqualified spe-
cialist workshop.
The wheel scould work loose if they are not
tightened to atorqu eof150 Nm.
For safety reasons, Mercedes- Benz recom-
mends that you only use wheel bolts of the
correct siz ewhich hav ebeen approved for
Mercedes-Ben zvehicles.
The wear patterns on the fron tand rea rtyres
differ ,dependin gontheopera tingconditions.
Interchange the wheels before aclear wear
pattern has formed on th etyres. Front tyres Changing
awheel
363Wheels and tyre s Z