Porsche Cayenne User Handbook

68 · Safety and environment | Safety
Recuperation.
The electronic engine management sys-
tem on the Cayenne S Hybrid controls
the braking process so that, when
the brake pedal is actuated, as much
expended energy as possible can be
harnessed by the electric machine in gen-
erator mode and stored in the 288-volt
nickel metal hydride (NiMH) battery. This
is referred to as recuperation. To do this,
the engine management system adjusts
the generator current depending on the
brake pedal position, recovers part of
the kinetic energy and stores it in the
battery. When the pressure on the brake
pedal exceeds a certain threshold, the
brakes are applied.
Porsche Ceramic Composite Brake
(PCCB).
Available as an option on all Cayenne
models, the Porsche Ceramic Composite
Brake (PCCB) has already proven its
ability to cope with the harshest require-
ments of the racetrack. It is available in
conjunction with 20-inch wheels or larger
for the Cayenne Turbo and with 19-inch
wheels or larger for all other Cayenne
models.
The discs are made from a specially
treated carbon-fibre compound that is
silicated in a high-vacuum process at
approximately 1,700 °C. The resulting
material is not only much harder than
cast iron, it is also more resistant to
heat.
Even at high temperatures, the thermal
resistance of the PCCB disc ensures
outstanding dimensional stability. The
ceramic material is totally resistant to
corrosion and offers excellent acoustic
damping properties.
PCCB enables shorter braking distances
– no matter how tough the driving
conditions. The pedal response is fast
and precise with only moderate input
required. Excellent fade resistance
ensures greater balance when slowing
from high speed.
The key advantage of PCCB is a total
weight saving of approximately 50 %
compared with equivalent cast-iron discs.
As well as enhancing performance and
fuel economy, the unsprung and rotating
masses are lightened. The results:
greater comfort and road-holding on
uneven road surfaces plus better
handling and agility.
Optional for all Cayenne models.
Porsche Ceramic Composite Brake (PCCB)
For fuel consumption, CO
2
emissions and efficiency class data, please refer to pages 150/151.

Porsche Cayenne Specifications

General

Brand	Porsche
Model	Cayenne
Category	Automobile
Language	English