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Tyre pressure
346
G
WARNING
If you fit unsuitable accessories onto tyre
valves, the tyre valves may be overloaded and
malfunction, which can cause tyre pressure
loss. Due to their design, retrofitted tyre pres-
sure monitors keep the tyre valve open. This
can also result in tyre pressure loss. There is a
risk of accident.
Only screw standard valve caps or valve caps
specifically provided by Mercedes-Benz for
your vehicle onto the tyre valve.
G
WARNING
If the tyre pressure drops repeatedly, the
wheel, valve or tyre may be damaged. Tyre
pressure that is too low may result in a tyre
blow-out. There is a risk of accident.
Check the tyre for foreign objects.
R
Check whether the wheel is losing air or the
R
valve is leaking.
If you are unable to rectify the damage, con-
tact a qualified specialist workshop.
H
Environmental note
Check the tyre pressure regularly, at least
every 14 days.
The recommended tyre pressures for various
operating conditions can be found in the tyre
pressure table inside the fuel filler flap
(
page 155).
Y
Operation with an emergency spare wheel:
information on operation with an emergency
spare wheel can be found under "Emergency
spare wheel" (
Y
Operation with a trailer: the applicable value
for the rear axle is the maximum value stated in
the tyre pressure table inside the fuel filler flap.
The tyre pressure table may state tyre pressures
for different load conditions. These are defined
in the table as different numbers of passengers
and amounts of luggage. The actual number of
seats may differ from this.
If tyre sizes are not specified, the tyre pressures
stated on the tyre pressure table apply for all
tyres approved at the factory for this vehicle.
page 357).
If a tyre size or several tyre sizes precede a tyre
pressure, the tyre pressure information follow-
ing is valid only for these tyre sizes.
If the preceding tire sizes include the symbol
+, the tyre pressure information following
shows alternative tyre pressures. These tyre
pressures may improve the ride comfort of your
vehicle. Fuel consumption may then increase
slightly.
Use a suitable pressure gauge to check the tyre
pressure. The outer appearance of a tyre does
not give any reliable indication of the tyre pres-
sure. On vehicles fitted with the electronic tyre
pressure monitor, you can also check the tyre
pressure using the on-board computer.
If possible, correct tyre pressures only when the
tyres are cold.
The tyres are cold:
if the vehicle has been parked with the tyres
R
out of direct sunlight for at least three hours
and
if the vehicle has not been driven further than
R
1.6 km
Depending on the outside temperature, the
vehicle speed and the load on the tyres, the tyre
temperature and thus the tyre pressure changes
by approximately 10 kPa (0.1 bar/1.5 psi) per
10 †. Take this into account when checking the
pressure of warm tyres. Correct the tyre pres-
sure only if it is too low for the current operating
condition.
Driving with a tyre pressure that is too high or
too low can:
shorten the service life of the tyres
R
cause increased tyre damage
R
have a negative effect on handling character-
R
istics and thus driving safety (e.g. aquaplan-
ing)
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