Electronically slip-controllable power brake system

An electronically slip-controllable power brake system, comprising:

• pressure-medium-actuable wheel brakes on a first axle of a motor vehicle;
• electromechanically actuable wheel brakes on a second axle of the motor vehicle;
• and
• a hydraulic unit configured to supply the pressure-medium-actuable wheel brakes with a pressure medium under brake pressure, wherein the hydraulic unit includes:
• a brake master cylinder which includes a master cylinder piston which is displaceably received and is coupled to a brake actuation element, for specifying a braking request by the driver,
• a simulator coupled to the brake master cylinder configured to specify an actuator travel and an actuating force of the brake actuation element,
• a first electronic controller which is supplied with electrical power by a first power supply unit and identifies an activation signal based on the braking request that has been specified,
• a brake pressure generator which can be driven by external energy based on the activation signal, for conveying the pressure medium under brake pressure to the pressure-medium-actuated wheel brakes, and
• a pressure modulator which can be controlled by the first electronic controller, for adjusting a wheel-specific wheel brake pressure,
• wherein a controllable first pressure medium connection between the brake master cylinder and the simulator, and a controllable second pressure medium connection between the brake master cylinder and a pressure-medium-actuated wheel brake are provided, and wherein the first electronic controller is configured to control the first and second pressure medium connections in opposite directions to one another, such that the first pressure medium connection is open when the second pressure medium connection is closed or the first pressure medium connection is closed when the second pressure medium connection is open.