brake pads PORSCHE CAYNNE 2010 1.G Information Manual

All Cayenne models have internal­
ly vented discs all round, ensuring
consistent performance during
heav y use. The front disc dimen ­
sions (diameter/thickness) are
350 mm/34 mm on the new

Cayenne and new Cayenne Diesel,
360 mm/36 mm on the new
Cayenne S and new Cayenne S
Hybrid, and 390 mm/38 mm on
the new Cayenne Turbo. All models have six
­piston
monobloc aluminium brake
calipers at the front and four ­
piston equivalents at the rear.
The calipers are black on the new
Cayenne and new Cayenne Diesel
and silver on the new Cayenne S
and new Cayenne S Hybrid. On
the new Cayenne Turbo, they
feature a striking red paint finish. Braking is assisted by a tandem
booster and large brake master
cylinder. Further assistance is
provided by PSM (p. 66).
The pads are equipped with
individual wear sensors. When
new pads are required, a
warning light is illuminated in
the instrument cluster.
Electric parking brake.
Manually activated and deactivat ­
ed, the electric parking brake
releases automatically as you drive
off.
Automatic hold function.
With the automatic hold function,
you can pull away on the flat or a
slope without ever rolling back.
The system automatically detects
when the vehicle has come to a
halt on an uphill gradient. PSM then
maintains the brake pressure at all
four wheels for a brief period to
prevent the vehicle from moving in
the opposite direction.
Braking systems.
Porsche brakes are renowned
worldwide as the benchmark in
performance
and durabilit y.
Equipped with new braking
systems, the new Cayenne
models continue this tradition.
The larger brakes of fer excellent
deceleration – even when the
car is fully laden with five adult
occupants, a full complement
of luggage and a braked trailer
load of up to 3,500 kg (Cayenne
with manual gearbox: 2,700 kg).
Outstanding brake performance.
To the point.
Standard braking system
(Cayenne/Cayenne Diesel) Standard braking system

(Cayenne S/Cayenne S Hybrid) Standard braking system (Cayenne Turbo)
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62 · Safety and environment | Safet y

PSM has three additional func­
tions that help reduce braking
distances. If the throt tle pedal
is released suddenly, PSM

automatically readies the braking
system. The pressure in the
brake lines is marginally increased,
bringing each of the pads into
light contact with the correspond ­
ing disc. If the driver goes on
to apply the brakes, the calipers
respond more quickly and the
braking distance is reduced. In an emergency stop – i.e. when
the pressure on the brake pedal
exceeds a certain threshold –
the brake assist function uses the
PSM hydraulics to apply maximum
braking force at all four wheels.
For added safet y, the system
also readies the brakes whenever
a decreasing distance to the
vehicle in front is detected. The
optional adaptive cruise control
and PSM interact to prefill the
brakes.
Even if adaptive cruise control is
inactive, the system registers the
speed of the vehicle in front and
automatically readies the braking
system. In addition, the system
alerts the driver to the decreasing distance by briefly tugging on
the brakes.
PSM also features a trailer
stabilisation function – for a
significant contribution to car
and trailer safet y.
Within the laws of physics, it
compensates for load transfer
caused by throt tle and brake

inputs up to the maximum degree
of lateral acceleration. It also en ­
hances the car’s driving dynamics
and directional stabilit y when
accelerating on inconsistent road
surfaces.
Other features include a special
control strategy in the ABS
for braking on loose surfaces.
By briefly locking the wheels, a wedge is formed ahead of each
t yre which provides additional
purchase to help slow the car,
e.g. on gravel or snow.
For a more involving driving

experience, PSM can also be
disabled, but remains active in
the background.
Standard on all new Cayenne
models.
accele

ration of the car. Using
this information, it is possible to
calculate the actual direction of
travel at any given moment. If
the car begins to oversteer or
understeer, PSM applies selective
braking on individual wheels to
restore stabilit y. If necessar y,
PSM can also intervene in the
engine management system to
temporarily modif y the amount of
drive transmit ted to the wheels.
Porsche Stability Management
(PSM).
Porsche Stabilit y Management
(PSM) is an electronic control
system that uses a range of
functions – including anti ­lock
braking (ABS) – to help stabilise
the vehicle (and trailer, if fit ted)
in hazardous road scenarios.
Throughout each journey, sensors
monitor the direction, speed,
yaw velocit y and lateral
Preparing for the road ahead.
With a little help from PSM.
Safety and environment | Safet y · 67