the present invention relates to a dual - circuit hydraulic brake system with slip control , in particular for automotive vehicles , wherein wheel brakes are connected via electromagnetically actuatable multiple - position valves to brake circuits which are hydraulically isolated from one another , wherein the brake circuits are adapted to be pressurized by a tandem master cylinder , on the one hand , and are connectible to a dual - circuit pump aggregate adapted to be driven electromotively , on the other hand . both outlets of the pump aggregate are connected to normally closed brake valves which are governed by the master cylinder pressure and separating valves which are adapted to be closed by the outlet pressure of the brake valves are inserted into the connections between the tandem master cylinder and the wheel brakes .