Braking system for vehicles comprising - at least one manual and/or automatic actuation device, operatively connected to a processing and control unit to transmit thereto a request for a braking action by a user, - at least one first electro-hydraulic actuator device operatively connected to a first and to a second hydraulic supply circuit (20,24) of a respective first and second braking device (28', 28"), the first electro-hydraulic actuator device being actuated by the processing and control unit depending on the request for a braking action, - wherein inside the first and second hydraulic supply circuits (20,24) a first and second device for regulating the pressure (48,52) are inserted, each interposed between the first electro-hydraulic actuator device and the corresponding braking device (28', 28") so as to identify an upstream branch, comprised between the first electro-hydraulic actuator device and the relative pressure regulator device (48, 52), and a downstream branch, comprised between each pressure regulator device (48, 52) and the relative braking device (28', 28"), each pressure regulator device (48,52) being operatively connected to the processing and control unit, - wherein the processing and control unit is programmed to be able to selectively and independently actuate the pressure regulator devices (48, 52) and the first electro-hydraulic actuator device, so as to set or vary the actuation pressures of the braking devices (28', 28"), downstream of the regulator devices (48, 52), regardless of the delivery pressures of the first electro-hydraulic actuator device, upstream of the regulator devices (48, 52). - wherein the first and second hydraulic supply circuits (20, 24) contain at least partially a brake fluid volume and a volume of magneto-rheological or electro-rheological fluid, said brake fluid volume and said volume of magneto-rheological or electro-rheological fluid being fluidically separate from each other, - characterized in that the regulator devices (48,52) comprise electric actuators suitable to generate a magnetic and/or electric field influencing said volume of magneto-rheological or electro-rheological fluid and modifying the rheological properties of the magneto-rheological or electro-rheological fluid to modulate the fluid connection between the first electro-hydraulic actuator device and each corresponding braking device (28', 28"), to selectively vary the delivery pressures in the downstream branches of the respective braking devices (28', 28''). - at least one manual and/or automatic actuation device, operatively connected to a processing and control unit to transmit thereto a request for a braking action by a user, - at least one first electro-hydraulic actuator device operatively connected to a first and to a second hydraulic supply circuit (20,24) of a respective first and second braking device (28', 28"), the first electro-hydraulic actuator device being actuated by the processing and control unit depending on the request for a braking action, - wherein inside the first and second hydraulic supply circuits (20,24) a first and second device for regulating the pressure (48,52) are inserted, each interposed between the first electro-hydraulic actuator device and the corresponding braking device (28', 28") so as to identify an upstream branch, comprised between the first electro-hydraulic actuator device and the relative pressure regulator device (48, 52), and a downstream branch, comprised between each pressure regulator device (48, 52) and the relative braking device (28', 28"), each pressure regulator device (48,52) being operatively connected to the processing and control unit, - wherein the processing and control unit is programmed to be able to selectively and independently actuate the pressure regulator devices (48, 52) and the first electro-hydraulic actuator device, so as to set or vary the actuation pressures of the braking devices (28', 28"), downstream of the regulator devices (48, 52), regardless of the delivery pressures of the first electro-hydraulic actuator device, upstream of the regulator devices (48, 52). - wherein the first and second hydraulic supply circuits (20, 24) contain at least partially a brake fluid volume and a volume of magneto-rheological or electro-rheological fluid, said brake fluid volume and said volume of magneto-rheological or electro-rheological fluid being fluidically separate from each other, - characterized in that the regulator devices (48,52) comprise electric actuators suitable to generate a magnetic and/or electric field influencing said volume of magneto-rheological or electro-rheological fluid and modifying the rheological properties of the magneto-rheological or electro-rheological fluid to modulate the fluid connection between the first electro-hydraulic actuator device and each corresponding braking device (28', 28"), to selectively vary the delivery pressures in the downstream branches of the respective braking devices (28', 28'').