Modern electronic anti-skid devices enable graduated adhesion braking to be employed with only a slight increase in the stopping distance. Employing the technique of maintained optimum slip, they utilize the available adhesion to the maximum and quickly regenerate this adhesion. With these anti-skid devices, disc brakes alone can achieve an excellent performance despite the lack of surplus adhesion that brakes with cast-iron shoes rubbing on the wheel rim can produce. In the regulation of the Faiveley AEF 83P anti-skid device the extra criterion d gamma /dt is used in addition to the usual criteria DELTA V/ gamma and d gamma /dt, which gives very good stability to the slip effect and this is a help in making better use of adhesion.
