The invention concerns a motor vehicle braking device characterised in that it comprises means (1) for measuring the load exerted on the rear wheel(s) (AR) combined with means (46, 5) for reducing the pressure at the wheel bridges (E) of the front wheel(s) (AV) and capable of supplying a required load on the rear wheel(s) (AR) of the vehicle to avoid any ill-timed lifting on said rear wheel(s) (AR) in case of powerful braking.