Active chassis control has become a very important subject in the recent years, because it offers new opportunities in the improvement of vehicle handling performance. This paper presents a new and sophisticated approach to stability control by longitudinal tire force control. It is based on the idea to take the driver's action as input for the control instead of waiting for the reaction of the vehicle. In order to estimate the safety margin it is necessary to determine the operating points of the tires in the tire performance graphs with the help of special sensors and a computer. The described system also allows to develop control strategies in order to involve more functions of an integrated active chassis system.