An electrohydraulic motor vehicle brake system , comprising: a first brake circuit with at least one wheel brake , a second brake circuit with at least one wheel brake , a first cylinder-piston device to be fluidly coupled with at least one of the first or the second brake circuit for hydraulic pressure generation in at least one of the first or the second brake circuit , wherein the first cylinder-piston device comprises at least one first piston , a second cylinder-piston device which comprises at least one second piston , and an electromechanical actuator of the second cylinder-piston device , which acts on the second piston , wherein the second cylinder-piston device is to be fluidly coupled with the first cylinder-piston device in order to provide a hydraulic pressure which is generated in the second cylinder-piston device upon an operation of the electromechanical actuator for an operation of the first cylinder-piston device , and wherein the second cylinder-piston device is to be fluidly coupled with the first brake circuit and/or the second brake circuit in such a manner that upon an operation of the electromechanical actuator of the second cylinder-piston device the first and/or the second brake circuit are to be directly applied with a hydraulic pressure which is generated in the second cylinder-piston device , wherein the second piston of the second cylinder-piston device divides the cylinder of the second cylinder-piston device into a first hydraulic chamber and a second hydraulic chamber , wherein the second piston of the second cylinder-piston device is displaceable in a first operating direction and in a second operating direction in order to change the volume of the first hydraulic chamber and of the second hydraulic chamber . a first brake circuit with at least one wheel brake , a second brake circuit with at least one wheel brake , a first cylinder-piston device to be fluidly coupled with at least one of the first or the second brake circuit for hydraulic pressure generation in at least one of the first or the second brake circuit , wherein the first cylinder-piston device comprises at least one first piston , a second cylinder-piston device which comprises at least one second piston , and an electromechanical actuator of the second cylinder-piston device , which acts on the second piston , wherein the second cylinder-piston device is to be fluidly coupled with the first cylinder-piston device in order to provide a hydraulic pressure which is generated in the second cylinder-piston device upon an operation of the electromechanical actuator for an operation of the first cylinder-piston device , and wherein the second cylinder-piston device is to be fluidly coupled with the first brake circuit and/or the second brake circuit in such a manner that upon an operation of the electromechanical actuator of the second cylinder-piston device the first and/or the second brake circuit are to be directly applied with a hydraulic pressure which is generated in the second cylinder-piston device , wherein the second piston of the second cylinder-piston device divides the cylinder of the second cylinder-piston device into a first hydraulic chamber and a second hydraulic chamber , wherein the second piston of the second cylinder-piston device is displaceable in a first operating direction and in a second operating direction in order to change the volume of the first hydraulic chamber and of the second hydraulic chamber . <EOS>