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Important notes on tire pressure
G
WARNING
If thetirepressuredrops repeatedly, the
wheel, valveortiremay be damaged. Tire
pressurethatistoo low may result in atire
blow-out.Thereisariskofanaccident.
R
Checkthe tire for foreign objects.
R
Checkwhether thewheelislosing air or the
valveisleaking.
If you are unable to rectify thedamage, con-
tactaqualified specialist workshop.
G
WARNING
If you fit unsuitable accessories onto tire
valves, thetirevalves may be overloaded and
malfunction,whichcan causetirepressure
loss.Due to their design,retrofittedtirepres-
suremonitors keep thetirevalveopen.This
can also result in tire pressureloss.Thereisa
riskofanaccident.
Only screw thestandard valvecap or other
valvecapsapprovedbyMercedes-Benzfor
your vehicleontothe tire valve.
Use asuitable pressuregauge to checkthe tire
pressure. The outer appearanceofatiredoes
notpermit any reliable conclusionabout thetire
pressure. On vehicles equipped withthe elec-
tronic tire pressuremonitor, thetirepressure
can be checkedinthe on-board computer.
The tire temperature and pressureincrease
when thevehicleisinmotion.This is dependent
on thedriving speedand theload.
Therefore, you should only correcttirepres-
sures when thetires are cold.
The tires are cold:
R
if thevehiclehas been parked withthe tires
out of direct sunlightfor at least three hours
and
R
if thevehiclehas been driven less than 1mile
(1.6 km)
Thetiretemperaturechanges dependingonthe
outside temperature, thevehicle speedand the
tireload. If thetiretemperaturecha
nges by
18 ‡(1
0 †), thetirepressure changes by
approximately 10 kPa(0.1bar/1.5 psi). Take
this intoaccountwhen checking thepressure of
warm tires. Only correctthe tirepressure if it is
toolow for thecurrentoperatingconditions. If
you check thetirepressure when thetires are
warm,the resultingvalue will be higher than if
thetires were cold. This is normal. Do not
reducethe tirepressure to thevalue specified
for coldtires. The tirepressure would otherwise
be toolow.
Observethe recommended tirepressuresfor
coldtires:
R
on theTire and Loading Information placard
on theB-pillar on thedriver'sside
R
in thetirepressure table in thefuel fillerflap
(
Y page 141)
Underinflated or overinflated tires
Underinflated tires
G
WARNING
Tireswith pressure that is toolow can over-
heat and burstasaconsequence. In addition,
they also suffer from excessive and/or irreg-
ular wear, whichcan severelyimpair thebrak-
ing properties and thedriving characteristics.
Thereisarisk of an accident.
Avoid tirepressuresthatare toolow in all the
tires, includingthe sparewheel.
Underinflatedtires may:
R
overheat, leadingtotiredefects
R
adversely affect handling
R
wear excessively and/or unevenly
R
have an adverse effect on fuel consumption
Overinflated tires
G
WARNING
Tireswith excessively high pressure can burst
because they are damagedmoreeasily by
road debris, potholes etc. In addition,they
also suffer from irregular wear, whichcan
severelyimpair thebraking properties and the
driving characteristics.Thereisarisk of an
accident.
Avoid tirepressuresthatare toohigh in all the
tires, includingthe sparewheel.
298
Tirepressure
Wheels and tires
300


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