Braking system for vehicles comprising - a manual actuator device , operable by means of a lever and / or a pedal , selectively connectable to at least one braking device placed on a first axle of the vehicle, and at least one braking device placed on a second axle of the vehicle, each braking device (16, 16', 16") acting on a respective brake disc or drum , - at least one front automatic actuator device , operatively connected to said manual actuator device by means of a first control unit , and to the at least one braking device of the first axle of the vehicle, - at least one rear automatic actuator device , operatively connected to the manual actuator device by means of a second control unit , and to the at least one braking device of the second axle of the vehicle, - wherein said control units are programmed so as to actuate the respective automatic front and rear actuator devices as a function of the position or configuration of the manual actuator device , - wherein at least the front automatic actuator device is of the electric-hydraulic type and is connected to a first hydraulic delivery circuit of the manual actuator device , by means of a first shut-off valve positionable in an operating position, in which it hydraulically disconnects the front automatic actuator device from the manual actuator device , and in a safety position in which it hydraulically connects the front electric-hydraulic automatic actuator device with the manual actuator device ; characterized in that the first shut-off valve is provided with a pair of non-return valves (80', 80"), in which a first non-return valve allows the discharge of any residual pressure left in the automatic hydraulic actuator devices, a second non-return valve has a filling function through connection with a brake fluid reservoir . - a manual actuator device , operable by means of a lever and / or a pedal , selectively connectable to at least one braking device placed on a first axle of the vehicle, and at least one braking device placed on a second axle of the vehicle, each braking device (16, 16', 16") acting on a respective brake disc or drum , - at least one front automatic actuator device , operatively connected to said manual actuator device by means of a first control unit , and to the at least one braking device of the first axle of the vehicle, - at least one rear automatic actuator device , operatively connected to the manual actuator device by means of a second control unit , and to the at least one braking device of the second axle of the vehicle, - wherein said control units are programmed so as to actuate the respective automatic front and rear actuator devices as a function of the position or configuration of the manual actuator device , - wherein at least the front automatic actuator device is of the electric-hydraulic type and is connected to a first hydraulic delivery circuit of the manual actuator device , by means of a first shut-off valve positionable in an operating position, in which it hydraulically disconnects the front automatic actuator device from the manual actuator device , and in a safety position in which it hydraulically connects the front electric-hydraulic automatic actuator device with the manual actuator device ; <EOS>