2010 PORSCHE CAYENNE brake sensor

sensors are used to measure a
range of values, including the
rotational speed of all four wheels,
the lateral and longitudinal
acceleration of the car, and
the current steering angle.
If, for example, the rear wheels
threaten to lose traction under
acceleration, a greater proportion
of drive torque is automatically
transmit ted to the front axle by a more positive engagement of
the multi
­plate clutch. In addition,
ASR minimises wheel spin. During
cornering, the required level of
engine torque is distributed to the
front wheels to ensure excellent
lateral stabilit y.
In conjunction with advanced
Porsche Stabilit y Management
(PSM, p. 66), PTM ensures the
perfect distribution of drive
torque for optimum traction in all road scenarios, whether on
long straights, through tight cor
­
ners or on surfaces with dif ferent
friction coef ficients. If one of the
wheels is about to lose traction,
PTM uses the ABD function to
apply the corresponding brake.
As a result, more drive is auto ­
matically transferred to the op­
posite wheel. If both wheels on
one axle are in danger of slipping,
ASR immediately intervenes and
modifies engine output to main ­tain drive. As well as enhancing
traction and active safet y,

Porsche Traction Management
(PTM) of fers exceptional handling
and driving dynamics.
Standard on the new Cayenne,
new Cayenne S and new
Cayenne Turbo.
Torque is distributed bet ween the
front and rear axles by means of
the electronically variable multi
­
plate clutch. For the toughest
off ­road terrain, the differential
can be locked using the PTM
control on the centre console.
With the aid of on ­board sensors,
the status of the car is continu ­
ously monitored and the front /
rear split is adjusted to match
changing driving conditions. The
Porsche Traction Management
(PTM) on the new Cayenne,
Cayenne S and Cayenne Turbo.
Porsche Traction Management
(PTM) is an active all ­wheel drive
system with an electronically
variable, map ­controlled multi ­
plate clutch, automatic brake
dif ferential (ABD) and anti ­slip
regulation (ASR).
Intelligent, discreet, responsive.
The ideal travelling companion.
All ­wheel drive on the Cayenne, Cayenne S and Cayenne Turbo
Drive systems and chassis | Transmission · 45

Making headway without getting in a spin.
An approach we thoroughly support.
Chassis.
In of f­road terrain, PT V Plus
reduces wheel spin on the rear
wheels – even when towing heav y
trailer loads. The electronically
controlled rear dif ferential can
be fully locked using the of f ­road
control on the centre console.
Optional for the new Cayenne,
new Cayenne S and new
Cayenne Turbo.
Porsche Active Suspension
Management (PASM).
PASM is an electronic damping
control system. It of fers con­
tinuous adjustment of individual
damping forces based on current
road conditions and driving st yle.
During performance driving or
heav y of f ­road use, there is an
increased tendency for the body
to sway. PASM prevents this from
happening, thereby improving
stabilit y and occupant comfort. PASM has three setup modes:
‘Comfort ’, ‘Normal’ and ‘Sport ’.
Whichever one you select, the
system uses a series of sensors
to monitor the movement of the
body. It also gathers data on
lateral acceleration, steering
angle, brake pressure and engine
torque and modifies the damping
force on each individual wheel

in accordance with the selected
mode. PASM remains active at all times.
It automatically adapts to the
prevailing driving conditions,

enabling greater car control and
improving comfort and safet y.
Optional for the new Cayenne,
new Cayenne Diesel, new
Cayenne S and new Cayenne S
Hybrid. Standard on the new
Cayenne Turbo: air suspension
with PASM.
This transfers drive torque to the
outside rear wheel which supports
the steering motion of the car,
thereby improving its cornering
dynamics.
At slow and medium speeds, PT V
Plus considerably enhances agilit y
and steering precision. At high
speeds, during fast cornering and
under wheel spin, the mechanical
limited ­slip rear differential
ensures additional stabilit y. Also
on variable ­grip surfaces, in the
wet and on snow, PT V Plus –
combined with Porsche Traction
Management (PTM) and Porsche
Stabilit y Management (PSM) –
provides a major contribution to
active safety.
Porsche Torque Vectoring Plus
(PTV Plus).
A new system for enhancing
driving dynamics and stabilit y,
PT V Plus offers variable distribu ­
tion of engine torque to the rear
wheels and mechanical limited ­
slip rear dif ferential. Depending
on the steering angle, steering
speed, throt tle pedal position,
yaw velocit y and vehicle speed,
PT V Plus optimises steering re ­
sponse and precision by applying
brake pressure to the left or right
rear wheel, as required.
Specifically, this means that when
entering a corner at high speed,
moderate brake pressure is
applied to the inside rear wheel.
Porsche Active Suspension Management (PASM)
50 · Drive systems and chassis | ChassisDrive systems and chassis | Chassis · 51

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)
Safety and environment
| Safet y · 63
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

Adaptive cruise control.
Optional on all Cayenne models,
adaptive cruise control regulates
the speed of your vehicle in line
with that of the vehicle in front. To
do that, the system uses a radar
sensor in the central air intake
to monitor the road up to 200 m
ahead. If you approach another vehicle
that is travelling slower than

your selected cruising speed,

the system slows the engine or
gently applies the brakes (up to
3.5 m/s
2). This continues until the
distance that you have preset is
maintained. If heavier braking is
required, the driver has to actively
intervene. Your vehicle will now follow the one in front at a
reduced speed.
If the other vehicle decelerates
further, adaptive cruise control
will continue to reduce your speed
– even down to a halt. When the
road ahead is free once more,

the car automatically returns
to your selected cruising speed bet ween 30 and 210 km/ h
(19 and 130 mph). To pull away
after an automatic stop, simply
use the control lever or depress
the accelerator pedal.
For added safet y, the system also
readies the brakes whenever a
decreasing distance to the vehicle
in front is detected. Adaptive
cruise control and PSM (p. 66)
interact to prefill the brakes.
The system visually and audibly
alerts the driver in the event
of a critical
decrease in distance
and briefly tugs on the brakes.
Optional for all new Cayenne
models.
Lane Change Assist (LCA).
The optional Lane Change Assist
(LCA) system monitors the area
behind the vehicle and the blind
spot using radar sensors. At speeds of 30 km/ h (19 mph) or
more, the system alerts the driver
of a vehicle in the blind spot or
approaching quickly from behind
via a visual signal from the
exter

ior mirrors. This enhances
comfort and safet y, particularly
when driving on the motorway.
However, LCA does not actively
intervene in the
controlling of
the vehicle and can be deactivated
at any time.
Optional for all new Cayenne
models.
Lane Change Assist (LCA)
Adaptive cruise control
Comfort and transport
| Driver assistance systems · 105
104 · Comfort and transport | Driver assistance systems

Index
A
Adaptive cruise control 104
Air intake system 40
Air suspension 52
Airbags 68
All ­wheel drive 44
Anti ­slip regulation (ASR) 44
Anti ­theft protection 99
Audio systems 88, 92, 94
Auto start /stop function 36
Automatic headlight
activation 60
Automatic hold function 63
Automatically dimming
mirrors 103
B
Bluetooth® 90
BOSE
® Surround
Sound System 92
Brake differential (ABD) 44
Brakes 62
Burmester
® High ­End
Surround Sound System 94
C
CD/ DVD autochanger 88
Ceramic brakes 64
Chassis 50
Child seats 84
Climate control 96
‘Coasting’ 23
C o l o u r s 112
Comfort lighting package 102
Comfort memory package 82
Common ­rail injection
system 38
Compass display 79
Cooling systems 38
Cornering lights 61
Cruise control 103
D
Day time running lights 61
Direct fuel injection (DFI) 38
Downhill assistance
(Porsche Hill Control – PHC) 47
Driver memory package 82

E
Electric machine 23, 28
Electronic logbook 90
Engine management
(electronic) 41
Engines 28
Environment 70
Exhaust emissions 72
Exhaust system 41
E x t e r i o r 112 , 116
F
Factory collection 125
Fuel economy 73
Fuel system 73
H
Headlights 60
Heat and noise ­insulating
glass 97
Heated windscreen 97
Hybrid module 28
I
Ignition system 74
Interior 79, 114, 120
Interior lighting 86
Interior safet y features 68
L
Lane Change Assist (LCA) 105
Lighting 60
Lightweight construction 70
Loading options 107
Loadspace management
system 108
Lubrication 39
Luggage compartment 106
M
Manual gearbox 42
Materials 75
Mobile phone preparation 90
MP3 89, 91
Multifunction
steering wheel 79, 91

N
Navigation system 88
O
Off­road capabilit y 48
On ­board computer 79
P
Panoramic roof system 100
Parallel full hybrid 28
Park Assist 102
Parking brake (electric) 63
Performance 28
Personalisation 110
Porsche Active Suspension
Management (PASM) 51
Porsche Ceramic Composite
Brake (PCCB) 64
Porsche Communication
Management (PCM) 88
Porsche Dynamic Chassis
Control (PDCC) 53
Porsche Dynamic Light
System (PDLS) 61
Porsche Entry & Drive 98Porsche Rear Seat

Entertainment 87
Porsche Side Impact
Protection (POSIP) 68
Porsche Stabilit y
Management (PSM) 66
Porsche Torque Vectoring
Plus (PT V Plus) 50
Porsche Traction
Management (PTM) 44
Privacy glass 97

R
Radio 88
Rain sensor 98
Recuperation 64
Recycling 75
Reversing camera
1

02
Roof transport system 108

S
Safety 58
Seat belt system 69
Seats 82
Self ­levelling 52, 106
S e rv i c i n g 74
Servotronic 55
Sports exhaust system 41
Steering 55
Storage compartments 86
S u n r o o f 10 0
Sunscreen 98
Supercharging system 40

T
Tailgate (automatic) 106
Taillights 61
Technical data 130
Telephone module 90
Tiptronic S 42
Touchscreen 88
Towbar systems 109
Tra n s m i s si o n 42
Turbocharging systems 40
T V tuner 91
Tyre Pressure Monitoring
( T PM) 57
U
Universal audio interface 91
USB port 91
V
Variable Turbine Geometry
(V TG) 40
Variable valve timing 37
VarioCam Plus 37
Vehicle tracking system 99
Voice control 90
W
Water­repellent side
windows 97
Weight reduction 54
Wheels 56
Index · 137
136 · Index