Porsche 911 Manual page 12

Same Driving Pleasure, More Safety
Awareness of braking behaviour in rain and
snow
In heavy rain, while driving through water or after
leaving a car wash, a film of water may form on the
brakes, delaying the braking action and requiring in-
creased pressure on the brake pedal.
Moreover, after a long drive in wintry road condi-
tions, a coating may form on brake discs and pads
that significantly reduces friction and therefore also
the braking action.
e Brake the brakes dry, especially before parking
the vehicle. This will prevent corrosion.
e Corroded brakes tend to "judder". If braking
comfort is noticeably impaired, have the brake
system checked.
Suitable tyres and appropriate driving style
> Please refer to chapter "Tyres and Wheels" on
page 238.
10
Responding correctly to uneven running or
vibrations
Damage to the tyres or vehicle can lead to uneven
running or vibration while driving. You may lose
control of the vehicle.
e Reduce your speed immediately, but without
braking sharply.
e Stop the vehicle and check the tyres. If you can-
not find a cause for the problem, continue driving
carefully and have the problem fixed. Visit a
qualified specialist workshop. Porsche recom-
mends a Porsche partner as they have trained
workshop personnel and the necessary parts and
tools.
Keeping tyres in safe condition
Damaged tyres can burst, especially at high speeds.
Prevent damage to tyres by driving in a manner that
protects your tyres.
e Cross kerb edges slowly and at right angles if
possible.
e Avoid driving over steep or sharp kerbs.
Running in new tyres
New tyres do not yet have maximum adhesion to the
road surface and tend to slip.
e Run in new tyres at a moderate speed for the
first 200 km (125 miles).
Driving with winter tyres
Winter tyres are subject to maximum speeds. If you
exceed the maximum permitted speed, a tyre may
burst.
e Always observe the maximum permitted speed
for the tyres you are using.
e Affix a sticker showing the maximum permitted
speed in the driver's field of vision. Observe
country-specific laws.
e Setting the maximum permitted speed as the
speed limit via the instrument cluster:
> Please refer to chapter "Instrument Cluster"
on page 120.
Driving with summer tyres
Parking or manoeuvring at outside temperatures
below 15 °C may result in noises.
e Change to winter tyres when outside tempera-
tures are below 7 °C.
Assistance systems and their limitations
Your Porsche is equipped with assistance systems
that enhance your safety and driving comfort.
None of these systems can overcome the laws of
physics affecting driving.
e Do not be tempted to take greater risks with your
safety. Assistance systems cannot reduce the
risk of accidents caused by an inappropriate
driving style.
e Assistance systems are no substitute for your
careful attention. Always remain attentive so that
you can react appropriately to the traffic
situation.
e Familiarise yourself with assistance systems be-
fore you use them.
Here you can find the Assistance systems at a
glance: