Method for operating a recuperative brake system of a vehicle, having the steps: actuating at least one valve (70a, 70b, 78a, 78b, 79a, 79b) of a brake circuit (50, 52) of the brake system before and/or during an operation of a generator of the brake system in such a way that brake fluid is moved from a master brake cylinder of the brake system and/or the brake circuit (50, 52) via the at least partially opened at least one valve (70a, 70b, 78a, 78b, 79a, 79b) into at least one low-pressure storage chamber (82a, 82b), arranged between wheel outlet valves (78a, 78b, 79a, 79b) of the brake circuit (50, 52) and at least one pump (80a, 80b) of the brake circuit (50, 52), of the brake circuit (50, 52); characterized by the steps: defining a target force differential variable relating to a booster force (Fv), applied by a brake booster, taking into account a generator braking torque information item relating to a generator braking torque (bgen) applied by the generator, a measured or estimated master brake cylinder pressure variable and/or an evaluation variable derived from at least the generator braking torque information item or the master brake cylinder pressure variable; and actuating the brake booster taking into account the defined target force differential variable in such a way that the booster force (Fv) is varied by an actual force difference corresponding to the target force differential variable. actuating at least one valve (70a, 70b, 78a, 78b, 79a, 79b) of a brake circuit (50, 52) of the brake system before and/or during an operation of a generator of the brake system in such a way that brake fluid is moved from a master brake cylinder of the brake system and/or the brake circuit (50, 52) via the at least partially opened at least one valve (70a, 70b, 78a, 78b, 79a, 79b) into at least one low-pressure storage chamber (82a, 82b), arranged between wheel outlet valves (78a, 78b, 79a, 79b) of the brake circuit (50, 52) and at least one pump (80a, 80b) of the brake circuit (50, 52), of the brake circuit (50, 52); characterized by the steps: defining a target force differential variable relating to a booster force (Fv), applied by a brake booster, taking into account a generator braking torque information item relating to a generator braking torque (bgen) applied by the generator, a measured or estimated master brake cylinder pressure variable and/or an evaluation variable derived from at least the generator braking torque information item or the master brake cylinder pressure variable; and actuating the brake booster taking into account the defined target force differential variable in such a way that the booster force (Fv) is varied by an actual force difference corresponding to the target force differential variable. defining a target force differential variable relating to a booster force (Fv), applied by a brake booster, taking into account a generator braking torque information item relating to a generator braking torque (bgen) applied by the generator, a measured or estimated master brake cylinder pressure variable and/or an evaluation variable derived from at least the generator braking torque information item or the master brake cylinder pressure variable; and actuating the brake booster taking into account the defined target force differential variable in such a way that the booster force (Fv) is varied by an actual force difference corresponding to the target force differential variable.