A method and an apparatus for allowing a vehicle to be braked in both a regenerative and a distributive type or frictional manner, thereby reducing the amount of energy which is dissipated as the vehicle is braked. Since the cylinder is capable of radial movement relative to the center yoke, if a lateral force acts on the cylinder, the lateral force acting on a hydraulic damper does not have any significant effect on the center yoke 17 with respect to radial movement or rocking movement thereof. A locating channel section is formed on outer face of a side wall of the slide body. The recorded state can subsequently be used to repeat the computation andor determine whether the computation was repeated successfully according to certain defined criteria.