Brake apparatus for vehicle

A brake apparatus for a vehicle, comprising:

• a cylinder comprising a supply flow path configured to supply working fluid of a reservoir and a hydraulic chamber connected to the supply flow path;
• a piston movably installed in the cylinder, and connected to a brake pedal;
• an elastic member installed in the hydraulic chamber so as to elastically support the piston;
• a sealing member installed on the outer surface of the piston so as to be in contact with the inner surface of the hydraulic chamber;
• and
• a communication flow path formed on the inner surface of the cylinder along the longitudinal direction of the cylinder, which guides the working fluid of the hydraulic chamber to the opposite side of the moving direction of the piston, when the piston is moved,
• wherein:
• the hydraulic chamber comprises:
• a first hydraulic chamber accommodating an end portion of the piston, and having the communication flow path formed therein;
• and
• a second hydraulic chamber having an inner diameter less than an inner diameter of the first hydraulic chamber, and connected to the supply flow path;
• the sealing member has a larger size than the inner diameter of the first hydraulic chamber and the outer diameter of a division ring of the piston;
• the sealing member divides the first hydraulic chamber into a first space and a second space when the piston is moved;
• and
• the working fluid of the first hydraulic chamber flows to the first and second spaces through the communication flow path when the piston is pressurized and depressurized.