a device for supplying a downstream hydraulic brake fluid to a hydraulic brake circuit of a motor vehicle equipped with a clutch includes an enclosure intended to contain the hydraulic fluid , the enclosure being provided with at least one outlet nozzle and with an inlet orifice . the enclosure forms a downstream portion of a reservoir , the reservoir comprising an upstream portion forming an upstream enclosure intended to collect an upstream hydraulic fluid from the clutch of the vehicle . the upstream enclosure 4 includes at least one inlet nozzle serving to transfer the upstream hydraulic fluid toward the upstream enclosure 4 . the inlet orifice is an intermediate orifice whereby the upstream enclosure opens into the downstream enclosure , the intermediate orifice being equipped with a means for filtering the upstream hydraulic fluid .