An active mechanical brake-force distributor with exclusively mechanical anti-locking function, which is installable inside braking systems in the technical-engineering field, actuated by motors and/or generators of various types (21, 22), wherein said active mechanical brake-force distributor it is provided with a single distribution free wheel and a plurality of interconnections consisting of gears or pulleys with belts (2, 3, 4, 5, 7, 14, 16, 19, 26, 27, 32, 33, 38, 39, 40, 41), interconnection shafts (3, 6, 11, 13, 17, 20) and motion transmission, modulation and inversion means or clutches adapted to provide rapid accelerations and equally efficient decelerations (10, 12, 15, 18, 22, 23, 24, 25, 29, 30, 31, 34, 35, 36, 37); said elements being operatively connected to one another to form various types of transmissions within said mechanical distributor, which is configured to optimize, in an exclusively mechanical and non-electronic manner, the controlled rotation under acceleration and deceleration of the vehicle wheels according to a mere rolling motion without slipping up to the maximum available friction coefficient on any type of road surface, and to modulate the speed itself of the vehicle under acceleration and deceleration with full control of the directional stability thereof, wherein the clutch comprises a multiple disc pack and • wherein, for the 4WD configuration, said single distribution free wheel is arranged in a position between the front axle and the point in which the engine transmits motion to the rear axle, and • in the case of front 2WD, said single distribution free wheel is positioned after the gear or member responsible for motion transmission so that such a configuration does not require additional braking means which act on one or more of the rear axles or wheels: characterised in that the active mechanical brake-force distributor is provided with a motor/generator having the axis parallel to the front axle and rear axle of the vehicle, but perpendicular to the axis of the multi-disc pack; or characterized in that the active mechanical brake-force distributior is provided with a motor/generator having the axis parallel to the front axle and rear axle of the vehicle, but perpendicular to the axis of the multi-disc pack, with said generator positioned with bevel gear in intermediate position with respect to the shaft connecting the multi-disc pack to the propulsion motion crown. • wherein, for the 4WD configuration, said single distribution free wheel is arranged in a position between the front axle and the point in which the engine transmits motion to the rear axle, and • in the case of front 2WD, said single distribution free wheel is positioned after the gear or member responsible for motion transmission so that such a configuration does not require additional braking means which act on one or more of the rear axles or wheels: characterised in that the active mechanical brake-force distributor is provided with a motor/generator having the axis parallel to the front axle and rear axle of the vehicle, but perpendicular to the axis of the multi-disc pack; or characterized in that the active mechanical brake-force distributior is provided with a motor/generator having the axis parallel to the front axle and rear axle of the vehicle, but perpendicular to the axis of the multi-disc pack, with said generator positioned with bevel gear in intermediate position with respect to the shaft connecting the multi-disc pack to the propulsion motion crown. characterised in that the active mechanical brake-force distributor is provided with a motor/generator having the axis parallel to the front axle and rear axle of the vehicle, but perpendicular to the axis of the multi-disc pack; or characterized in that the active mechanical brake-force distributior is provided with a motor/generator having the axis parallel to the front axle and rear axle of the vehicle, but perpendicular to the axis of the multi-disc pack, with said generator positioned with bevel gear in intermediate position with respect to the shaft connecting the multi-disc pack to the propulsion motion crown.