Patent ID: 8783793

Claim:
A brake apparatus comprising: a housing having a fluid passage and a closed-ended bore communicated with the fluid passage; a piston body disposed in the closed-ended bore; a first elastic member that biases the piston body toward a closed end of the bore; and a pressure regulating valve disposed in the fluid passage, the pressure regulating valve comprising a valve element, a seat portion that is brought into contact with the valve element, a rod disposed between a piston crown surface of the piston body and the valve element, the rod acting to move the valve element apart from the seat portion, and a second elastic member having one end contacted with the valve element and biasing the valve element toward the seat portion, the second elastic member having an elastic force smaller than that of the first elastic member, wherein the brake apparatus has a reservoir function of reserving brake fluid flowed from a wheel cylinder of a vehicle in the closed-ended bore by strokes of the piston body when anti-lock brake system control is executed, the piston body is a resin-molded member with a hard member, the hard member being fixed to the piston crown surface, the hard member having a hardness larger than that of a resin material of the piston body, and the piston body and the rod are brought into contact with each other via the hard member.