is kept open continuously, which may lead to
air loss. G
WARNING
Should the tyre pressure drop repeatedly:
R chec kthe tyre for 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-Ben zisfitted on the tyre
valve.
Tyre pressures that are too low have anega-
tive effect on vehicle safety, which could lead
you to cause an accident.
If possible, only correct tyre pressures when
the tyres are cold. The tyres are cold when
the vehicle has been parked for at least three
hours or has been driven less than 1.5 km.
Depending on the ambient temperature, the
speed you are driving at and the load on the
tyres, the tyre temperature and thus the tyre
pressure may change by approximately
10 kPa (0.1 bar/1.5 psi) per 10 †. Take this
into account when checking the pressure of
warm tyres and only correct it if it is too low
for the current operating conditions.
Driving with tyre pressure that is too high or
too low can:
R shorten the service life of the tyres
R cause increased tyre damage
R have anegative effect on handling charac-
teristics and thus the driving safety (e.g. by
causing aquaplaning)
i The tyre pressure values given for low
loads are minimum values which offer you
good ride comfort characteristics.
However, you can also use the values given
for higher loads. These are permissible and
will not adversely affect the running of the
vehicle. H
Environmental note
Check the tyre pressure regularly,atl east
every 14 days. Tyrep
ressur eloss warning system
Important safety notes While the vehicle is in motion, the tyre pres-
sure loss warning system monitors the set
tyre pressure using the rotational 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, acorresponding warning
message will appearint he multifunction dis-
play. G
WARNING
The tyre pressure loss warning system does
not warn you of an incorrectly set tyre pres-
sure. The table on the inside of the fuel filler
flap will help you decide whether the tyre
pressures should be corrected.
The tyre pressure loss warning system 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 detected by the tyre pressure loss
warning system.
The tyre pressure monitor is not able to warn
you of asudden loss of pressure, e.g. if the
tyre is penetrated by aforeign object.
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 conditionsa re wintry.
R you are driving on sand or gravel.
R you adopt avery sporty driving style (cor-
nering at high speeds or driving with high
rates of acceleration).
R you are towing avery heavy or large trailer.
R you are driving with aheavy load (in the
vehicle or on the roof). 322
Tyrep
ressureWheels and tyres
Restarting the tyre pressure loss warn-
in gs ystem Restar
tthe tyre pressure loss warning system
if you have:
R changed the tyre pressure
R changed the wheels or tyres
R fitted new wheels or tyres
X Before restarting, consult the table of tyre
pressures on the inside of the fuel filler flap
to ensure that the tyre pressure in all four
tyres is set correctly for the respective
operating conditions.
X Observe the notes in the section on tyre
pressures (Y page 321). G
WARNING
The tyre pressure loss warning system can
only give reliablew arnings if you have set the
correct tyre pressure.
If an incorrectt yre pressure is set, these
incorrectv alues will be monitored.
At yre wit hinsufficien tpressure results in
vehicl einstability when driving, thus increas-
ing the risk of an accident.
X Make sure that the key is in position 2
(Y page1 47) in the ignitio nlock.
X Press =or; on the steering wheel
to select the Service menu.
X Press 9or: to select Tyre pres‐ sure .
X Press the abutton.
The Run Flat Indicato ractive Restart possible with OK message
appears in the multifunction display. If you wishtoc
onfirm the restart:
X Press the abutton.
The Tyre pressure now OK? message
appears in the multifunction display.
X Press the 9or: button to select
Yes .
X Press the abutton.
The Run Flat Indicato rrestarted message appears in the multifunction dis-
play.
After
ateach-in period, the tyre pressure
loss warning system willm onitor the set
tyre pressures of all four tyres.
If you wishtoc ancel the restart:
X Press the %button.
or
X If the Tyre press. now OK? message
appears, press 9or: to select
Cancel .
X Press the abutton.
The tyre pressure values stored at the last
restart willc ontinue to be monitored. Changing
awheel Flat tyre
The "Breakdown assistance" section
(Y pag e296) contains information and notes
on how to dea lwith aflatt yre. It also provides
instruction sonchangin gaw heelorf itting the
spar ewhee lore mergency spar ewheel. Interchangin
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 aquali fied
specialist worksho pthath as th enecessary
specialist knowledg eand tools to carry out Changing
awheel
323Wheels and tyres
Z
