Brake-by-wire automatic brake system for vehicles

A braking system for vehicles, comprising:

• a manual actuator device, operable via 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 acting on a respective brake disc or drum,
• at least one front automatic actuator device, operatively connected to said manual actuator device via 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 via 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 an electric-hydraulic type and is connected to a first hydraulic delivery circuit of the manual actuator device, via 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;
• in which the first shut-off valve is provided with a pair of non-return valves, 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.