Vehicle brake system and method for operating a brake system

A brake system of a vehicle, comprising:

• an electronic data interface for transmitting a brake command,
• wherein the brake command can be transmitted exclusively electronically to the brake system, and
• first and second electromechanical pressure generating units which can implement the brake command and which are hydraulically connected to a hydraulic brake circuit,
• wherein the brake system has a plurality of actuator valves, each of which is assigned to a brake actuator on a vehicle wheel and each of which can selectively pressurize and depressurize the brake,
• wherein each of the first and second pressure generating units is designed to be able to apply sufficient braking pressure to actuate all brake actuators,
• wherein the brake circuit includes two brake lines which extend from the second pressure generating unit to the actuator valves and which are fluidically connected by a first connecting line, into which a fluid line from the first pressure generating unit opens, and
• wherein switchable valves are arranged in the first connecting line between an opening and the brake lines, respectively, which each, in normal operation, is switched to allow fluid flow from the first pressure generating unit to the brake lines and, in an emergency operation, in which the first pressure generating unit has failed, can be switched to prevent fluid flow from the first pressure generating unit to the brake lines wherein a second connecting line is provided as a parallel circuit to the first connecting line, wherein a fluid line from the first pressure generating unit opens into the second connecting line, wherein switchable valves are arranged in the second connecting line between an opening and the brake lines, respectively, which each, in normal operation, is switched to allow fluid flow from the first pressure generating unit to the brake lines, and in an emergency operation, in which the pressure generating unit has failed, can be switched to prevent fluid flow from the first pressure generating unit to the brake lines.