Porsche Cayenne Turbo Driver Manual page 193

ABS brake system
(anti-lock brake system)
Safety notes!
In spite of the advantages of ABS, it is still the
driver's responsibility to adapt his driving style and
manoeuvres in line with road and weather condi-
tions, as well as the traffic situation.
The increased safety that is provided should not
induce you to take greater risks with your safety.
The limits set by the physics of driving cannot be
overcome, even with ABS.
Risks of accident due to inappropriate speed
cannot be reduced by ABS.
ABS ensures
– Full steering control
The vehicle remains steerable
– Good driving stability
No skidding due to locked wheels
– Optimum braking distance
Shorter stopping distances in most cases
– Prevention of wheel locking
No flat spots on the tyres
Function
The decisive advantage of ABS is in the driving
stability and manoeuvrability of the vehicle in
hazardous situations.
The ABS prevents locking of the wheels during full
braking, on almost all road surfaces, until shortly
before the vehicle stops.
The ABS begins to control the braking process as
soon as a wheel shows a tendency to lock.
This controlled braking process is comparable
with extremely rapid cadence braking.
The pulsating brake pedal and a "juddering noise"
warn the driver to adapt his driving speed to the
road conditions.
f If full braking is necessary, fully depress the
brake pedal during the whole braking opera-
tion, even though the pedal is pulsating. Do not
reduce the braking pressure.
Warning light
If the ABS warning lights light up on the instrument
panel and on the multi-purpose display of the
instrument panel while the engine is running, ABS
has switched off because of a fault.
In this case, the braking system will operate
without lock prevention, as in vehicles without
ABS.
f Adapt your driving style to the changed
braking behaviour.
The ABS system must be checked immediately
in order to prevent the occurrence of further
faults with effects which cannot be defined.
Consult a qualified specialist workshop. We
recommend that you use a Porsche partner for
this work since these are staffed with trained
personnel and have the necessary parts and
tools.
The ABS control unit is adjusted for the approved
tyre dimensions.
The use of tyres with non-approved dimensions
can lead to different wheel speeds, causing ABS
to switch off.
Driving and Driving Safety
193