Porsche 911 CARRERA 4 -, Owner'S Manual

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interrogated and goes out when the engine is
started if the check is not yet complete. If the
ABS warning lamp fails to go out, this indicates
that ABS has been deactivated due to a fault. If
the warning lights in the instrument panel and
on-board computer light up while you are driving,
this indicates that a fault has occurred. In both
cases, normal braking, as in vehicles without ABS,
is still retained.
The ABS system should, however, be examined
at an authorized Porsche dealer immediately to
prevent the occurrence of further faults.
If the ABS system becomes inoperative, take
your vehicle to your authorized Porsche dealer
immediately.
Warning!
Risk of an accident, resulting in serious
personal injury or death. The control unit
of the ABS brake system is set for standard
tire size. If non-standard tires are installed,
the control unit may misinterpret the speed
of the vehicle, because of the variant data it
receives from the sensors on the axles.
Use only tire makes and types tested by
Porsche.
76
Controls, Instruments