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Wheels and tyres
287
Tyre pressure monitor system
Tyres with directional tread pattern
T
yres with directional tread pattern have been
designed to operate best when rotating in only
one direction. An arrow on the tyre sidewall in-
dicates the direction of rotation on tyres with
directional tread. Always observe the indicated
direction of rotation in order to guarantee opti-
mum grip and help avoid aquaplaning, exces-
sive noise and wear.
If the tyre is mounted in the opposite direction
of rotation, drive with extreme caution, as the
tyre is no longer being used correctly. This is
of particular importance when the road surface
is wet. Change the tyre as soon as possible or
remount it with the correct direction of rotation.
Works after changing a wheel
●
Replace the hub caps or wheel bolt caps
(depending on equipment).
●
Return all tools to their proper storing loca-
tion.
●
If the replaced wheel does not fit in the spar
e
wheel housing, store it safely in the luggage
compartment ›››page220.
●
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
›››page287.
●
Have the tightening torque of the wheel nuts
check
ed as soon as possible with a torque
wrench ›››page286. Meanwhile, drive care-
fully.
●
Have the flat tyre replaced as quickly as pos-
sible.
Tyre pressure monitor sys-
tem
Tyre pressure monitor indicator
Fig.192 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.
The tyre pressure monitor indicator warns of
any change in the tread diameter of a wheel
›››Fig.192.
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 ›››page35.
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