Porsche Cayenne Turbo Driver Manual page 287

Wheel alignment
Uneven tread wear indicates incorrect wheel align-
ment. In this case, the vehicle should be checked.
f Consult a qualified specialist workshop. We
recommend that you use a Porsche partner for
this work since these are staffed with trained
personnel and have the necessary parts and
tools.
Warning!
Risk of accident. You can lose control of the
vehicle.
If, during a journey, uneven running or vibra-
tions occur that could be caused by damage
to tyres or the car:
f Reduce speed immediately, but without
braking sharply.
f Stop the vehicle and check the tyres.
If no cause for the fault can be found, drive
carefully to the nearest qualified specialist
workshop.
We recommend that you use a Porsche
partner for this work since these are staffed
with trained personnel and have the necessary
parts and tools.
Replacing tyres
f Before having new tyres fitted, find out about
the current approval status.
f Use only tyre makes tested and approved by
Porsche.
Basically, only tyres of the same make, same
type and with the same specification number
(e.g. "N0", "N1" ...) may be fitted.
In the initial period, new tyres do not have their full
grip.
f Therefore, do not drive above moderate
speeds during the first 100 to 200 km
(60 to 120 miles).
If new tyres are fitted to only one axle, the
different tread depths on the two axles can cause
a marked change from the previous driving behav-
iour to which you have become accustomed. This
is particularly true when new tyres are fitted to the
rear axle.
The effect is reduced continuously, however, as
tyre mileage increases.
f Adapt your driving style to the changed
handling.
Tyres should only be fitted by specialist firms.
When a defective tyre is replaced, it should be
noted that deviations in tread depth must not
exceed 30 % on one axle.
f Do not use second-hand tyres if you do not
know their history.
Valves
f Use only plastic valve caps.
Rubber valves must be replaced whenever the
tyres are changed.
In the case of metal valves, please observe the
fitting and replacement instructions.
Use only genuine Porsche metal valves or valves
of the same quality, which are manufactured
according to the specifications and production
demands of Porsche.
f Protect valve inserts against soiling with valve
caps.
Soiled valve inserts can cause a gradual loss
of air.
Minor Repairs
287