Hydraulic brake system - having a first pressure-generating unit, and - having a second pressure-generating unit, - wherein the second pressure-generating unit has, for the purpose of supplying a connected wheel brake with hydraulic fluid under open-loop and/or closed-loop control, a wheel inlet valve assigned to the wheel brake, a wheel outlet valve and a hydraulic delivery device which is connected on the delivery side to the wheel inlet valve, - wherein the first pressure-generating unit is connected to the second pressure-generating unit so as to be able to be hydraulically interrupted by a first interruption means in a non-bypassable manner in such a way that, in the closed position of the first interruption means, a hydraulic connection between first pressure-generating unit and second pressure-generating unit is no longer possible, - wherein the second pressure-generating unit has at least one hydraulic connection which is connected to the first interruption means, - wherein the first interruption means are structurally separated from the second pressure-generating device, - wherein the first interruption means can be connected to a hydraulic accumulator via the at least one hydraulic connection, the wheel inlet valve, the wheel outlet valve and via at least one wheel brake cylinder, - wherein the hydraulic delivery device of the second pressure-generating unit is connected on the suction side to the wheel outlet valve, - wherein the hydraulic accumulator is hydraulically connected, together with the inlet side of the hydraulic delivery device, via third interruption means between the master brake cylinder and second interruption means, - wherein the hydraulic delivery device is hydraulically connected to the second interruption means which connect the hydraulic delivery device to a master brake cylinder, - wherein the master brake cylinder is hydraulically connected to a simulator device, and - wherein the simulator device is connected on the inlet side to the master brake cylinder, characterized - in that the simulator device is connected on the outlet side via a simulator blocking valve to a compensating reservoir of the brake system, - in that the second interruption means are hydraulically non-bypassable, with the result that, in the closed position of the second interruption means, there exists no hydraulic connection between the hydraulic delivery device and the master brake cylinder and between the master brake cylinder and the hydraulic delivery device, and - in that in each case one of the first interruption means is hydraulically connected via the at least one hydraulic connection of the second pressure-generating unit to a delivery side of the hydraulic delivery device of the second pressure-generating unit, to the wheel inlet valve and to one of the second interruption means. - having a first pressure-generating unit, and - having a second pressure-generating unit, - wherein the second pressure-generating unit has, for the purpose of supplying a connected wheel brake with hydraulic fluid under open-loop and/or closed-loop control, a wheel inlet valve assigned to the wheel brake, a wheel outlet valve and a hydraulic delivery device which is connected on the delivery side to the wheel inlet valve, - wherein the first pressure-generating unit is connected to the second pressure-generating unit so as to be able to be hydraulically interrupted by a first interruption means in a non-bypassable manner in such a way that, in the closed position of the first interruption means, a hydraulic connection between first pressure-generating unit and second pressure-generating unit is no longer possible, - wherein the second pressure-generating unit has at least one hydraulic connection which is connected to the first interruption means, - wherein the first interruption means are structurally separated from the second pressure-generating device, - wherein the first interruption means can be connected to a hydraulic accumulator via the at least one hydraulic connection, the wheel inlet valve, the wheel outlet valve and via at least one wheel brake cylinder, - wherein the hydraulic delivery device of the second pressure-generating unit is connected on the suction side to the wheel outlet valve, - wherein the hydraulic accumulator is hydraulically connected, together with the inlet side of the hydraulic delivery device, via third interruption means between the master brake cylinder and second interruption means, - wherein the hydraulic delivery device is hydraulically connected to the second interruption means which connect the hydraulic delivery device to a master brake cylinder, - wherein the master brake cylinder is hydraulically connected to a simulator device, and - wherein the simulator device is connected on the inlet side to the master brake cylinder, characterized - in that the simulator device is connected on the outlet side via a simulator blocking valve to a compensating reservoir of the brake system, - in that the second interruption means are hydraulically non-bypassable, with the result that, in the closed position of the second interruption means, there exists no hydraulic connection between the hydraulic delivery device and the master brake cylinder and between the master brake cylinder and the hydraulic delivery device, and - in that in each case one of the first interruption means is hydraulically connected via the at least one hydraulic connection of the second pressure-generating unit to a delivery side of the hydraulic delivery device of the second pressure-generating unit, to the wheel inlet valve and to one of the second interruption means.