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Water film on brake disks
WARNING
In heavy rain, when driving through water or after
leaving a car wash, braking action may be reduced
and increased pressure may be required.
e
Allow a greater braking distance to the vehicle in
front and "brake" the brakes dry at intervals. Do
not allow following traffic to be affected.
Reduced braking action
WARNING
After a long drive over salted or gritted roads, a coat-
ing may form on the brake disks and pads that sig-
nificantly reduces friction and therefore reduces the
braking action as well.
The brake disks may start to corrode and cause vibra-
tion if your vehicle is parked for an extended period of
time.
e
To prevent corrosion on brake disks, "brake"
the brakes dry before stopping the vehicle (not
on vehicles with Porsche Ceramic Composite
Brake).
e
If braking comfort is noticeably impaired, a
professional brake system inspection is recom-
mended.
Visit an authorized Porsche dealer. Porsche rec-
ommends an authorized Porsche dealer, as they
have trained technicians and the required parts
and tools.
e
In order to relieve the brake system on downhill
grades, shift to a lower gear (engine braking).
If engine braking is not sufficient on downhill
grades, apply the footbrake at intervals. Continu-
ous braking overheats the brakes, impairing their
effect.
For information on brake fluid and checking the brake
fluid level:
g Refer to chapter "Brake Fluid" on page 201.
Responding to warning messages
Always heed any warning and information messages
displayed in the vehicle.
g Refer to chapter "Warning and Information Mes-
sages" on page 121.
When the vehicle is switched on, the braking func-
tions are automatically checked for their state. The
warning and indicator lights light up briefly and go
out again. A continuous brake warning light indicates
a fault.
e
Have the fault corrected immediately. Visit an
authorized Porsche dealer. Porsche recommends
an authorized Porsche dealer, as they have
trained technicians and the required parts and
tools.
If the electric parking brake cannot be fully applied
when the vehicle is stationary, the indicator light on
the switch and the brake warning light flash.
Brake pad wear limit
When the brake pad wear limit is reached, a warning
message is displayed on the instrument cluster.
g Refer to chapter "Warning and Information Mes-
sages" on page 121.
e
Have the brake pads replaced immediately. Visit
an authorized Porsche dealer. Porsche recom-
mends an authorized Porsche dealer, as they
have trained technicians and the necessary parts
and tools.
Driving and Driving Assistance
Brake pads and brake disks
Wear on different brake system components (e.g.
brake pads and brake disks) depends on driving style
and conditions of use and cannot be generally ex-
pressed in terms of mileage.
Certain speeds, braking forces and ambient condi-
tions (e.g. temperature and humidity) can cause the
brakes to squeal.
The values quoted by Porsche are based on normal
use under general traffic conditions. Wear increases
significantly if the vehicle is used on race tracks or if a
similar driving style is used.
e
Before such driving (e. g. on race tracks), ask an
authorized Porsche dealer about current guide-
lines.
e
Have the brake pads and brake disks checked for
wear before and after driving on race tracks.
Electric parking brake
The electric parking brake acts on the rear wheels
and is used to secure the vehicle when it is station-
ary.
77
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