Porsche Cayman Owner's Manual page 139

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Loss of braking power
WARNING
The brake booster is ready for operation only
while the engine is running.
If the engine is switched off or there is a defect in
the brake booster, much greater force has to be
applied to the pedal when braking.
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Vehicles with defective brakes must not
be towed and must be transported on a flat
bed.
For information on towing:
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Please see the chapter "TOWING"
on page 253.
Brake wear
Your car has excellent brakes, but they are still
subject to wear. The rate at which they wear
depends on how the brakes are used.
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Have the brake system inspected at the
intervals recommended in your Maintenance
Booklet.
Brake system warning light
You can check the functionality of the brake
system warning light by switching the ignition to
the "On" position (position 1) and verifying that the
warning light illuminates.
Brake wear warning message USA
Brake wear warning message
Canada
A warning message will be displayed on the multi-
function display of the instrument panel if the
brake pads are worn, excessively.
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Do not continue to operate the vehicle.
Have your authorized Porsche dealer inspect
or replace the brake pads.
For information on warning messages on the
multi-purpose display:
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Please see the chapter "OVERVIEW OF
WARNING AND INFORMATION MESSAGES"
on page 114.
Brake pads and brake disks
Wear on the brake pads and brake disks depends
to a great extent on the driving style and the
conditions of use and therefore cannot be
expressed in actual miles on the road.
The high-performance brake system is designed
for optimal braking effect at all speeds and
temperatures.
Certain speeds, braking forces and ambient
conditions (e.g. temperature and humidity) can
therefore cause the brakes to "squeal".
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Obstructed brake pedal
WARNING
Unsuitable or incorrectly installed floor mats or
objects can obstruct the movement of the brake
pedal or prevent application of the brake pedal.
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Do not obstruct the pedal travel with floor mats
or other objects.
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Wet brakes
WARNING
In heavy rain, while driving through water or after
leaving a car wash, the braking action may be
delayed and increased pressure may be required.
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For this reason, keep further back from the
vehicle in front and "dry" the brakes by
applying them at intervals. Make sure that the
traffic behind you is not affected.
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Reduced braking
WARNING
efficiency
After a long drive over salted or gritted roads,
a coating may form on the brake disks and pads
that significantly reduces friction and therefore
also braking effect.
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Even though the brake disks consist of alloyed
gray cast iron, they will unavoidably start to
corrode if your vehicle is parked for an
extended period. The brakes will tend to "rub"
as a result.
The nature, extent and effects of corrosion
depend on the amount of time the vehicle was
parked, whether road salt or grit was spread
and whether grease-dissolving agents were
used in car washes (not on vehicles with
Porsche Ceramic Composite Brake).
To prevent corrosion of the brake disks,
"brake them dry" before parking the vehicle
(not on vehicles with Porsche Ceramic
Composite Brake).
If braking comfort is noticeably impaired, we
recommend that you have the brake system
checked by experts at an authorized Porsche
dealer.
Driving and Driving Safety
137