ABS DEVICE FOR A HYDRAULIC BRAKING SYSTEM OF A CYCLE OR MOTORCYCLE OR OF A LIGHT VEHICLE

An ABS device of a cycle includes an electrically actuated valve unit, switchable between a first operating condition in which a master cylinder is placed in communication with an actuator cylinder of a brake device, and a second operating condition, in which the communication is interrupted and the actuator cylinder is placed in communication with a fluid accumulator. An electronic controller is configured for controlling the position of the movable member of the fluid accumulator, during an activation of the ABS function and a deactivation of the ABS function, to cause a non-abrupt, but progressive, variation of the pressure in the line connecting to the actuator cylinder of the brake device.