Method for operating a recuperative brake system of a vehicle having at least two brake circuits (10, 12), comprising the steps: determining a braking intensity variable relating to an actuation of a brake actuation element of the brake system by a driver of the vehicle; determining a setpoint generator braking torque of a generator of the brake system taking into account at least the determined braking intensity variable; actuating the generator taking into account the defined setpoint generator braking torque in such a way that a generator braking torque which corresponds to the setpoint generator braking torque is applied to at least one wheel of the vehicle, and if the actuated generator applies a generator braking torque over a predefined minimum generator braking torque to the at least one wheel of the vehicle and the determined braking intensity variable lies between a predefined first braking intensity value and a predefined second braking intensity value which is higher than the first braking intensity value, actuating the at least two brake circuits (10, 12) of the brake system, comprising the steps: - placing a first brake circuit of the at least two brake circuits (10, 12) of the brake system in a blending mode, wherein a hydraulic connection between a master brake cylinder of the brake system and a storage volume of the first brake circuit which is placed in the blending mode is at least temporarily opened so that brake fluid is transferred from the master brake cylinder into the storage volume of the first brake circuit which is placed in the blending mode; and - placing a second brake circuit of the at least two brake circuits (10, 12) in a non-blending mode, wherein a hydraulic connection between the master brake cylinder and a storage volume of the second brake circuit which is placed in the non-blending mode is interrupted during the non-blending mode; characterized in that if a generator braking torque which is above the predefined minimum generator braking torque is applied by means of the actuated generator and the determined braking intensity variable is between the predefined second braking intensity value and a predefined third braking intensity value which is higher than the second braking intensity value, the first brake circuit and the second brake circuit are placed in the blending mode. determining a braking intensity variable relating to an actuation of a brake actuation element of the brake system by a driver of the vehicle; determining a setpoint generator braking torque of a generator of the brake system taking into account at least the determined braking intensity variable; actuating the generator taking into account the defined setpoint generator braking torque in such a way that a generator braking torque which corresponds to the setpoint generator braking torque is applied to at least one wheel of the vehicle, and if the actuated generator applies a generator braking torque over a predefined minimum generator braking torque to the at least one wheel of the vehicle and the determined braking intensity variable lies between a predefined first braking intensity value and a predefined second braking intensity value which is higher than the first braking intensity value, actuating the at least two brake circuits (10, 12) of the brake system, comprising the steps: - placing a first brake circuit of the at least two brake circuits (10, 12) of the brake system in a blending mode, wherein a hydraulic connection between a master brake cylinder of the brake system and a storage volume of the first brake circuit which is placed in the blending mode is at least temporarily opened so that brake fluid is transferred from the master brake cylinder into the storage volume of the first brake circuit which is placed in the blending mode; and - placing a second brake circuit of the at least two brake circuits (10, 12) in a non-blending mode, wherein a hydraulic connection between the master brake cylinder and a storage volume of the second brake circuit which is placed in the non-blending mode is interrupted during the non-blending mode; - placing a first brake circuit of the at least two brake circuits (10, 12) of the brake system in a blending mode, wherein a hydraulic connection between a master brake cylinder of the brake system and a storage volume of the first brake circuit which is placed in the blending mode is at least temporarily opened so that brake fluid is transferred from the master brake cylinder into the storage volume of the first brake circuit which is placed in the blending mode; and - placing a second brake circuit of the at least two brake circuits (10, 12) in a non-blending mode, wherein a hydraulic connection between the master brake cylinder and a storage volume of the second brake circuit which is placed in the non-blending mode is interrupted during the non-blending mode;