The anti-skid device is intended for use on a front-wheel drive vehicle having a braking system consisting of a master cylinder connected to a first and a second hydraulic circuit each connected to the operating cylinders of the brakes of a respective pair of diagonally opposed wheels, of the motor vehicle. The device comprises:a braking sensor,a sensor of the average speed of the front wheels of the motor vehicle,a sensor of the speed of rotation of at least one rear wheel of the motor vehicle,a sensor of the steering angle of the wheels,two electrically controlled changeover valves inserted in the first and the second hydraulic circuit respectively, and which can, upon receiving a command signal, allow at least partial reduction of the braking force of the respective wheels to which they are connected, andan electronic control and command unit which controls the operation of said valves in dependence upon the signals supplied by said sensors.