Brake system with at least two hydraulic circuits and at least two pressure supply devices

A brake system for a vehicle, comprising the following components:

• two hydraulic brake circuits each with at least one hydraulically acting wheel brake,
• a first pressure supply device arranged to supply pressure to the wheel brakes, wherein the first pressure supply device, by back and forth movement of a piston, is able to build up and to reduce pressure in at least one of the two hydraulic brake circuits,
• a second pressure supply device with a pump with continuous delivery action, in the form of a piston pump, gear pump or eccentric piston pump, which is driven by an electromotive drive, and which is arranged to build up pressure in at least one of the two hydraulic brake circuits,
• at least one valve arrangement with valves for wheel-specific setting of brake pressures and/or for isolation of the wheel brakes from or connection of the wheel brakes to at least one of the first or second pressure supply devices,
• at least one electronic open-loop and closed-loop control unit, and
• a hydraulic connecting line arranged to connect the two brake circuits,
• wherein each wheel brake is assigned one dedicated switching valve of the at least one valve arrangement, and wherein each of the two hydraulic brake circuits has a hydraulic main line, via which the switching valves are connectable to each of the first and second pressure supply devices,
• wherein two of the wheel brakes are directly connected via their assigned dedicated switching valves to a first one of the hydraulic main lines and two of the wheel brakes are directly connected via their assigned dedicated switching valves to a second one of the hydraulic main lines,
• wherein at least one outlet valve of the at least one valve arrangement is provided for pressure reduction by dissipation into a reservoir, and
• wherein the first and the second pressure supply devices are configured for different maximum pressures or pressure levels, and
• wherein the brake system further comprises:
• an electric brake pedal with a travel simulator and with driver demand detection using one or more sensors and a sensor electronic control unit, or
• a master brake piston-cylinder unit actuable by a brake pedal, wherein the master brake piston-cylinder unit includes only one piston and one pressure chamber, wherein the one pressure chamber is connected to a travel simulator and is connectable to at least one of the two hydraulic brake circuits via a hydraulic line, and wherein at least one controlled valve of the at least one valve arrangement is arranged to shut off the hydraulic line.