Braking system for vehicles comprising - a first brake group and a second brake group intended to be installed on the same axle of a vehicle or on separate axles of a vehicle, - the first brake group comprising a first braking device , first electro-hydraulic actuator means operatively connected to the first braking device by means of a first hydraulic actuation duct , - the second brake group comprising a second braking device , second electro-hydraulic actuator means operatively connected to the second braking device by means of a second hydraulic actuation duct , - an interconnection branch between the first and the second hydraulic actuation ducts , provided with a control valve , - at least one control unit for the brake groups , operatively connected to the electro-hydraulic actuator means and to the control valve , - the control unit being programmed to actuate the control valve so as to: - disconnect the first and second hydraulic actuation ducts from each other in the event of standard operation or absence of malfunctions in the brake groups , - fluidically connect the first and second hydraulic actuation ducts to each other in the event of an electrical fault in a brake group , characterized in that , in order to obtain a parking brake function, the at least one control unit is programmed to perform the following sequence: - open the control valve and move a first float of the first electro-hydraulic actuator means into the forward or braking position, the pressure exerted in the second actuation duct moving a second float (48") of the second electro-hydraulic actuator means into the rearward position, - command the closing of the control valve , - move the first float rearward, - command the opening of the control valve , to equalize the pressures in the first and second hydraulic actuation ducts . - a first brake group and a second brake group intended to be installed on the same axle of a vehicle or on separate axles of a vehicle, - the first brake group comprising a first braking device , first electro-hydraulic actuator means operatively connected to the first braking device by means of a first hydraulic actuation duct , - the second brake group comprising a second braking device , second electro-hydraulic actuator means operatively connected to the second braking device by means of a second hydraulic actuation duct , - an interconnection branch between the first and the second hydraulic actuation ducts , provided with a control valve , - at least one control unit for the brake groups , operatively connected to the electro-hydraulic actuator means and to the control valve , - the control unit being programmed to actuate the control valve so as to: - disconnect the first and second hydraulic actuation ducts from each other in the event of standard operation or absence of malfunctions in the brake groups , - fluidically connect the first and second hydraulic actuation ducts to each other in the event of an electrical fault in a brake group , - disconnect the first and second hydraulic actuation ducts from each other in the event of standard operation or absence of malfunctions in the brake groups , - fluidically connect the first and second hydraulic actuation ducts to each other in the event of an electrical fault in a brake group , - open the control valve and move a first float of the first electro-hydraulic actuator means into the forward or braking position, the pressure exerted in the second actuation duct moving a second float (48") of the second electro-hydraulic actuator means into the rearward position, - command the closing of the control valve , - move the first float rearward, - command the opening of the control valve , to equalize the pressures in the first and second hydraulic actuation ducts . <EOS>