Hydraulic brake system and method for operating a hydraulic brake system

A hydraulic braking system, comprising:

• a first pressure generating unit;
• a second pressure generating unit, yhe first pressure generating unit being hydraulically interruptibly and uncircumventably connected to the second pressure generating unit via a first interrupting element in such a way that with the first interrupting element in a closed position, a hydraulic connection between the first pressure generating unit and second pressure generating unit (2) is no longer possible.

The hydraulic braking system as recited in claim 31, wherein the hydraulic accumulator is hydraulically connected together with the input side of the hydraulic conveying device via a third interrupting element between the brake master cylinder and the second interrupting element.

A method for operating a hydraulic braking system that includes a first pressure generating unit and a second pressure generating unit, the first pressure generating unit being hydraulically interruptibly and uncircumventably connected to the second pressure generating unit via a first interrupting element in such a way that with the first interrupting element in a closed position, a hydraulic connection between the first pressure generating unit and second pressure generating unit is no longer possible, the method comprising:

• generating, in a first operating mode, the wheel brake pressure in the at least one wheel brake cylinder solely by way of the first brake pressure generating device and being directed via the first interrupting element.