Porsche Cayenne 2009 Owner's Manual page 202

Soiling can impair the braking action.
f Check and clean the brakes if they have been
soiled.
Danger of steering assistance failing during
a long journey in the water if the drive belt
slips.
f If the steering assistance fails, more effort will
be required to steer.
Danger of damaging electrical systems
f Avoid driving through salt water.
Notes on operation
f Activate the Low Range program.
f Switch the air conditioner off.
f Switch the headlights off.
202
Driving and Driving Safety
Tips on driving
f Avoid high engine speeds (max. 2,500 rpm).
f Do not perform manual gear changes when
driving, and try to avoid stopping.
Moving off in the water can be difficult due to
the high resistance and the loose surface
involved.
f Start the water crossing at a shallow place at
walking speed.
f After checking the body of water, take the
shortest path through it.
f Never drive into the water at high speed. The
resulting "bow wave" could damage the engine
and its accessories.
f Adjust your driving style to the unfamiliar sur-
roundings.
f Cross the body of water slowly and at a con-
stant speed.
f Never turn around when crossing a body of
water.
f If it is not possible to cross the body of water,
the car must be backed out of it in reverse
gear.
The servo pump and alternator can fail if the car is
driven through water for an extended period.
f If the servo pump fails, substantially more
force will have to be exerted in order to steer.
Maintenance Note
The car requires a special check after the water
crossing.
f Remove mud from the tire tread.
f Briefly apply the brakes in order to dry them
after driving through the water.