Patent ID: 8650872

Claim:
A control unit of a hydraulic brake apparatus for a vehicle including a housing provided between a master cylinder and a plurality of wheel cylinders; the control unit comprising: within the housing, a switching control valve provided at a first passage connected to the master cylinder; pressure increase control valves, one of which provided in one passage branched from the first passage and the other of which provided in the other passage branched from the first passage; pressure decrease control valves, one of which connected to one of the pressure increase control valves at the side of the wheel cylinders, and the other of which connected to the other of the pressure increase control valves at the side of the wheel cylinders; a reservoir connected to the pressure decrease control valves; a pump driven by a motor so as to suck a brake fluid from the reservoir and to discharge the brake fluid by way of an outlet valve to a portion between the switching control valve and the pressure increase control valves; a second passage arranged in such a way that one end of the second passage is connected to the switching control valve at the side of the master cylinder and the other end of the second passage is connected to the reservoir, the second passage being controlled so as to be communicated or interrupted by means of a switching valve; an inner bore formed within the housing; and a passage forming member being liquid-tightly fitted into the inner bore at both end portions of the passage forming member in order to form an extended ring-shaped passage between an outer circumferential surface of the passage forming member and an inner circumferential surface of the inner bore and between both end portions of the passage forming member, wherein the extended ring-shaped passage forms a part of the first passage, and each of the switching control valve, the pressure increase control valves and the outlet valve is connected to the extended ring-shaped passage, a part of the second passage is formed within the passage forming member, one end portion of the part of the second passage formed within the passage forming member is connected to the switching control valve at the side of the master cylinder, and the other end portion of the part of the second passage formed within the passage forming member is connected to the switching valve.