Porsche Cayman Owner's Manual page 138

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Brake hydraulic failure
WARNING
recovery
Your vehicle is equipped with an emergency
function in the extreme event of a complete
hydraulic failure of the brake system. If your brake
pedal goes all the way to the floor, do not pump
the brakes.
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Push the brake pedal down firmly and hold it in
that position. A mechanical linkage activates
the second circuit, and you will be able to bring
the vehicle to a stop.
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After bringing your vehicle to a complete stop,
avoid driving the vehicle and instead have it
towed to the nearest authorized Porsche
dealer for repair.
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 warning light USA
Brake warning light Canada
The warning light in the instrument panel lights up.
A message will be displayed on the multi-function
display of the instrument panel if the brake fluid
level is too low, or (if the brake pedal travel has
increased) one of the two brake circuits has failed.
A greater braking pressure will be required,
stopping distances will be longer and the braking
behavior will change, particularly in curves.
136
Driving and Driving Safety
With correctly adjusted brakes and a correctly
working brake system, the pedal travel to the
point of brake application should be 1-3/16 in. to
1-9/16 in. (30 to 40 mm). Whenever the brake
pedal travel exceeds this value, have the brake
system checked.
Brake pedal
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Obstruction of brake
WARNING
pedal
Unsuitable or incorrectly fixed floor mats or
objects can reduce the travel of the brake pedal or
prevent you applying the brake pedal.
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Always check the movement of the brake
pedal before driving and make sure that it is
not obstructed by a floor mat or any other
object.
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Secure the floor mat to prevent it from sliding
into positions that could interfere with the safe
operation of your vehicle.
Your authorized Porsche dealer will be glad to
offer you floor mats of the correct size
including a securing possibility.
Information
In case one of the two brake circuits fails,
increased pedal travel is required to bring your
vehicle to a full stop.
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Riding the brakes
WARNING
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Before descending a steep grade, reduce
speed and shift the transmission into a lower
gear to control speed.
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Do not "ride the brakes" by resting your foot on
the pedal when not intending to apply brake
pressure.
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Do not hold the pedal down too long or too
often. This could cause the brakes to overheat
and lose braking power.
Brake booster
The brake booster assists braking only when
the engine is running.
When the car is moving while the engine is not
running, or if the brake booster is defective, more
pressure on the brake pedal is required to bring
the car to a stop.
Moisture, road salt or grit on brakes affects
braking.
Brakes will dry after a few cautious brake
applications.
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WARNING Wet brakes
Driving through water may reduce the traction.
Moisture on brakes from road water, car wash, or
a coating of road salt or grit may affect braking
efficiency.
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Cautiously apply brakes to test and dry the
brakes after exposure to road water, etc.