Improved brake valve

The valve (22) has an inlet orifice connected to a pressure supply unit i.e. hydraulic pump (23), and an outlet orifice connected to a braking unit (25). A leakage orifice is connected to a reservoir (24). A supply distributor (26) connects the inlet orifice with the outlet orifice in a braking configuration and connects the leakage orifice with the outlet orifice in a rest configuration. The supply distributor is controlled by two calibrating units independently. The calibrating units comprise proportional distributors (27, 37).