Porsche carrera gt-2004 Manuel D’Utilisation

Controls, Instruments

41

Operation of the ABS system 

A wheel speed sensor is mounted to each of the 

four wheels. If wheel lock-up of either of the front 

wheels or the rear wheels is sensed during brak-

ing, the brake pressure is adjusted automatically 

until the wheel no longer locks up.
The proper operation of ABS is perceived by the 

driver as a pulsating brake pedal in conjunction 

with audible noise and perhaps some vibration. 
f If you experience these sensations while driv-

ing or a road surface with questionable trac-

tion, reduce vehicle speed appropriate for the 

prevailing road conditions.

The functional readiness of all the main electrical 

components of the ABS is checked by an 

electronic monitoring system both before and 

while you drive. 

When the ignition is switched on the ABS warning 

light will light up while the system is electronically 

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 indi-

cates 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 driv-

ing, 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 pre-

vent the occurrence of further faults. 
f If the ABS system becomes inoperative, take 

your vehicle to your authorized Porsche dealer 

immediately. 

on the axles.
f Use only tire makes and types tested by 

Porsche.

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