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
