Abstract
Objectives of anti-lock ayatema are defined. fbv extranul con-trol principle is expluined and foor prototype anti-lock sys-tems, baserf on tbis principles, tbnt are currently bein;; de-veloped are dcscribed. I'anic stoppint diatunce performance of4-wheel and reet anti-lock systema on dry, wet and icy roerfaia compared. Ilirectionul control tests tbat :,:eaeure 4-v;lreeland teer anti-lock syetems capabilities ure deacribedpA testprogram to be aserf in determining system performance uccepta-bility is preaented.