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If a tyre size precedes a tyre pressure, the
following 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
R
than 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 charac-
R
teristics and thus driving safety (e.g. aqua-
planing)
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.
Speeds up to 210 km/h: despite the values
stated on the tyre pressure information label
(fuel filler flap), for speeds up to 210 km/h
and with R16 tyres, the values stated can be
reduced as follows, without a reduction in
safety:
Saloon: Ò30 kPa (Ò0.3 bar/Ò4 psi)
R
Estate: Ò20 kPa (Ò0.2 bar/Ò3 psi)
R
This does not apply to vehicles towing a
trailer.
This improves the ride comfort of your vehi-
cle; however, fuel consumption may increase
slightly.
Tyre pressure loss warning system
General 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 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 dis-
play.
You can recognise the tyre pressure loss
warning by the
Run Flat Indicator
Run Flat Indicator
active Restart with OK
active Restart with OK
appears in the
Serv.
Serv.
tion display. Information on the message dis-
play can be found in the "Restarting the tyre
pressure loss warning system" section
(
page 422).
Y
Tyre pressure
message which
menu of the multifunc-
Z
421
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