arranged in the simulator spring chamber 30 which is advantageously biased the simulator chamber 29 is connectable to the first pressure chamber 17 of the tandem master brake cylinder 2 for example by means of an electrically actuatable advantageously normally closed simulator release valve 32 when a pedal force has been predetermined and the simulator release valve 32 has been activated pressure medium flows from pressure chamber 17 of the master brake cylinder into the simulator chamber 29 a check valve 34 arranged hydraulically antiparallel to the release valve 32 enables independently of the switching status of the release valve 32 a largely unhindered backflow of the pressure medium from the simulator chamber 29 to pressure chamber 17 of the master brake cylinder the simulation device 3 can accordingly be switched in and out by means of the release valve 32 the electrically controllable pressure supply device 5 takes the form of a hydraulic cylinder piston arrangement or a single circuit electrohydraulic actuator the piston 36 of which can be actuated by a schematically indicated electric motor 35 with interposition of a rotary translatory transmission which is likewise represented schematically a rotor position sensor only indicated schematically serving for registering the rotor position of the electric motor 35 is denoted by reference symbol 44 in addition use may also be made of a temperature sensor for sensing the temperature of the winding of the motor piston 36 delimits a pressure chamber 37 the actuator pressure generated by the action of the force of piston 36 on the pressure medium enclosed in pressure chamber 37 is fed into the system pressure line 38 and registered with the system pressure sensor 19 in the u201c brake by wire u201d operating mode.