Braking system for vehicles comprising - a pilot pump (8,108,110) equipped with manual actuation means, lever- and/or pedal-operated, which is fluidically connected to a hydraulic actuator device (12,112,114) which is operatively connected to a braking device (16,116,118) associated with a wheel (5,6) of said vehicle, - wherein the hydraulic actuator device (12,112,114) delimits a first and a second actuation chamber (20,24) separated fluidically by a septum movable in an axial direction (X-X), - wherein the first actuation chamber delimits a first volume which contains fluid pressurized by the pilot pump (8,108,110) via the manual actuation means, - wherein the second actuation chamber delimits a second volume which contains pressurized fluid and is equipped with a delivery duct fluidically connected to said braking device (16,116,118), wherein - the hydraulic actuator device (12,112,114) comprises a by-pass, configured to fluidically connect or disconnect the first actuation chamber and the delivery duct, - the movable septum is connected to motor means (48,148,150) so that it may translate axially, regardless of the braking action imposed by the pilot pump (8,108,110) via the manual actuation means, - the system comprising a control unit operatively connected with said motor means (48,148,150) and programmed to switch from a standard operating condition or deactivation of the motor means (48,148,150), wherein the movable septum places in communication the first actuation chamber with the by-pass, with the second actuation chamber and with the delivery duct, to a braking correction condition wherein the motor means are actuated to translate the movable septum so that the first actuation chamber is separated fluidically from the delivery duct, and so that the second actuation chamber is fluidically connected to the delivery duct to control the actuation of the braking device via the pressurized fluid contained in the second actuation chamber, wherein the movable septum comprises a collar and a stem, the collar realizing the hydraulic separation between the first and second actuation chamber (20,24), the stem passing through said first and second actuation chamber (20,24) and being operatively connected to the motor means, characterized in that the stem and/or the collar are dimensioned overall so that, following the axial stroke of the movable septum, there is no difference between the reduction of volume available in the first actuation chamber and the increase in volume in the second actuation chamber. - a pilot pump (8,108,110) equipped with manual actuation means, lever- and/or pedal-operated, which is fluidically connected to a hydraulic actuator device (12,112,114) which is operatively connected to a braking device (16,116,118) associated with a wheel (5,6) of said vehicle, - wherein the hydraulic actuator device (12,112,114) delimits a first and a second actuation chamber (20,24) separated fluidically by a septum movable in an axial direction (X-X), - wherein the first actuation chamber delimits a first volume which contains fluid pressurized by the pilot pump (8,108,110) via the manual actuation means, - wherein the second actuation chamber delimits a second volume which contains pressurized fluid and is equipped with a delivery duct fluidically connected to said braking device (16,116,118), wherein - the hydraulic actuator device (12,112,114) comprises a by-pass, configured to fluidically connect or disconnect the first actuation chamber and the delivery duct, - the movable septum is connected to motor means (48,148,150) so that it may translate axially, regardless of the braking action imposed by the pilot pump (8,108,110) via the manual actuation means, - the system comprising a control unit operatively connected with said motor means (48,148,150) and programmed to switch from a standard operating condition or deactivation of the motor means (48,148,150), wherein the movable septum places in communication the first actuation chamber with the by-pass, with the second actuation chamber and with the delivery duct, to a braking correction condition wherein the motor means are actuated to translate the movable septum so that the first actuation chamber is separated fluidically from the delivery duct, and so that the second actuation chamber is fluidically connected to the delivery duct to control the actuation of the braking device via the pressurized fluid contained in the second actuation chamber, wherein the movable septum comprises a collar and a stem, the collar realizing the hydraulic separation between the first and second actuation chamber (20,24), the stem passing through said first and second actuation chamber (20,24) and being operatively connected to the motor means, characterized in that the stem and/or the collar are dimensioned overall so that, following the axial stroke of the movable septum, there is no difference between the reduction of volume available in the first actuation chamber and the increase in volume in the second actuation chamber.