Abstract: Disclosed is a brake system wherein the wheel brake is hydraulically connected with a relief chamber of periodically variable volume. A valve 11 controlled by control electronics is switched to connect the chamber to either the wheel brake or a reservoir synchronously to the direction of movement of a piston in the relief chamber to either increase or decrease pressure at the brake for the purpose of antilock and slip control of the brake.

Abstract: Above the level of a toothed disc (26), a sensor is fastened to a base member (23) by means of a lateral retaining arm (24). The retaining arm contains a guide bore (13) which extends vertically to the fastening surface (12) of the base member (23) and which receives in a sliding fit a substantially circular-cylindrical carrier member (11) which is formed with a central bore (33) for receiving a fastening bolt (15) screwed into a threaded bore (22) of the base member (23). The carrier member (11) extends into the inside of the guide bore (13) and terminates in an upper annular end surface (10). A circlip (14) whose external diameter corresponds to the diameter of the guide bore (13) seats on the end surface. In the area of the circlip, the bolt (15) has a cone-like enlargement (16) which, when the fastening bolt (15) is tightened, will be seated on the circlip (14) and press it axially against the carrier member (11) and radially against the wall defining the guide bore (13).

Abstract: A switch valve arrangement (10) for changing over the inlet of a fluid pressure slave unit (16-19) from the outlet of a first fluid generator (5 or 6) to the outlet of a second fluid pressure generator (1, 13), during switch-on of the second fluid pressure generator for brake systems of automotive vehicles. The arrangement comprises a first valve (V.sub.1) which, upon switch-on of the second fluid pressure generator (1, 13) blocks the connection between the first pressure geneator (5) and the fluid pressure slave unit (16-19), and comprises a second valve (V.sub.2) releasing the connection between the second fluid pressure generator (1, 13) and the fluid pressure slave unit (16-19). Upon switch-on of the second fluid pressure generator (1, 13), provision is made so that the second valve (V.sub.2), with a fluid-releived first valve (V.sub.1) and a fluid pressure-loaded second valve (V.sub.