Investigations and analyses of braking behavior of inexperienced drivers in emergency situations have shown that the Brake Assist System which determines an appropriate emergency braking operation and assists in applying the necessary braking force is effective in terms of active safety. While the system designed to detect an emergency braking operation and to consistently apply the maximum braking force is effective for those drivers who cannot apply sufficient braking effort, the system will make experienced drivers feel disagreeable because the system may work against their intention to control the vehicle. Consequently, we utilized au ABS actuator to develop a type of Brake Assist System with excellent control performance and less disagreement. z