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Tyre pressure
308
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 on the fuel filler flap
(
page 152).
Y
Operation with an emergency spare wheel:
information on operation with an emergency
spare wheel can be found in the general notes in
the "Emergency spare wheel" section
(
page 318).
Y
Additionally, the tyre pressure table may also
state tyre pressures for different load condi-
tions. These are defined in the table as different
numbers of passengers and amounts of lug-
gage. The actual number of seats may vary; for
more information, please refer to the vehicle's
registration documents.
If tyre sizes are not specified, the tyre pressures
stated on the tyre pressure table apply for all
tyres approved for this vehicle.
If a tyre size precedes a tyre pressure, the fol-
lowing tyre pressure information is only valid for
that tyre size.
Use a suitable pressure gauge to check the tyre
pressure. The outer appearance of a tyre does
not permit any reliable conclusion about the tyre
pressure. On vehicles fitted with the electronic
tyre pressure monitor, the tyre pressure can be
checked using the on-board computer.
If possible, only correct tyre pressures 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 ambient 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. Only correct the tyre
pressure if it is too low for the current operating
conditions.
Driving with 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-
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istics and thus driving safety (e.g. aquaplan-
ing)
The tyre pressure values given for low loads are
minimum values which offer you good ride com-
fort 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.
Tyre pressure loss warning system
General notes
While the vehicle is in motion, the tyre pressure
loss warning system monitors the set tyre pres-
sure using the rotational speed of the wheels.
This enables the system to detect significant
pressure loss in a tyre. If the speed of rotation of
a wheel changes as a result of a loss of pressure,
a corresponding warning message will appear in
the multifunction display.
You can recognise the tyre pressure loss warn-
ing by the
Run Flat Indicator active
Run Flat Indicator active
Restart with OK
Restart with OK
message which appears in
the
Serv.
Serv.
menu of the multifunction display.
Information on the message display can be
found in the "Restarting the tyre pressure loss
warning system" section (
page 309).
Y
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