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326
Wheels and tyres
●
If the replaced wheel does not fit in the spar
e
wheel housing, store it safely in the luggage
compartment ›››page257.
●
Check the tyre pressure of the newly moun-
ted tyre as soon as possible.
●
In vehicles fitted with a tyre pressure indica-
tor, adjust the pressure and store it in memory
›››page326.
●
Have the tightening torque of the wheel nuts
checked as soon as possible with a torque
wrench ›››page325. Meanwhile, drive care-
fully.
●
Have the flat tyre replaced as quickly as pos-
sible.
Tyre pressure monitor sys-
tem
Tyre pressure monitor indicator
Fig.223 Instrument panel
: warning of loss of
tyre pressure.
The tyre pressure monitoring system compares
the individual speeds of each wheel and thus
the dynamic r
adius with the help of the ABS
sensors.
If the rolling circumference of one or more
wheels has changed, the tyre pressure monitor-
ing indicator will indicate this on the instrument
panel through a warning lamp and a warning to
the driver ›››Fig.223. When only one specific
tyre is aected, its position within the vehicle
will be indicated.
Loss of pressure: Check left tyre
pressure!
Wheel tread change
The wheel diamet
er changes when:
●
Tyre pressure is changed manually.
●
Tyre pressure is insucient.
●
The tyre structure is damaged.
●
The vehicle is unbalanced because of a load.
●
The wheels on an axle are subject to a heav-
ier load (e.g. with a heavy load).
●
The vehicle is fitted with snow chains.
●
The temporary spare wheel is fitted.
●
The wheel on one axle is changed.
There may be a delay in the reaction of the tyre
pressure monitoring indicator
or it may not
indicat
e anything under certain circumstances
(e.g. sporty driving, snow-covered or unpaved
roads, or when driving with snow chains).
Calibrate the tyre pressure monitoring indi-
cator
After changing the tyre pressure or replacing
one or more wheels, the tyre pressure moni-
toring indicator must be recalibrated. Do the
same, for example, when the front and rear
wheels are swapped.
●
Switch the ignition on.
●
Save the new inflation pressure in the Info-
tainment system: function button
> Vehi-
cle status > Tyres; OR:
> External
settings > Tyres ›››page34.
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