Hydraulic brake unit with anti-lock and traction control system for motor vehicles

A hydraulic brake unit (1) with anti-locking and traction control system (39) for motor vehicles including front and rear wheel brakes,

• a master brake cylinder (2), a storage tank 3 on said master cylinder, a brake line (8) connected to said master cylinder, a valve arrangement (13) in said brake line (8) for brake pressure modulation in a wheel brake, extends between said master brake cylinder (2) and at least one wheel brake (9) of a brake circuit (II), a return line (14) runs from the valve arrangement (13) for the pressure medium taken from the wheel brake (9) to the suction side of a high-pressure pump (17), a feed line (19) is connected on the pressure side to the brake line (8) between the master brake cylinder (2) and the valve arrangement (13), between a connection of the feed line (19) and the master brake cylinder (2), a changeover valve (21) is arranged in the brake line (8), an overflow line (22) extends from said changeover valve (21) and includes a pressure limiting valve (23) which terminates on the master brake cylinder side in the brake line (8), the return line (14) has a suction line (26) connected to it for a pressure media with a pressure in the brake line (8) between the master brake cylinder (2) and a check valve (27) in suction line (26) which is switched by the change over valve (21), the return line (14) is connected, between the valve arrangement (13) and the connection of the suction line (26), to a storage chamber (31) for the pressure media, the suction line (26) starts from the brake line (8) between the master brake cylinder (2) and the changeover valve (21), and a non-return valve (32) is arranged in the return line (14) between the connection of the suction line (26) and the storage chamber (31).