| 摘要 |
A housing of a master cylinder device includes a housing member separating an interior of the housing into a front and a rear side chambers and having an opening through the housing member. A pressurizing piston includes a main body portion disposed in the front side chamber and is moved forward by a force for pressurizing the brake fluid. An input piston can move forward by an operation force. An input chamber into which a brake fluid from a high pressure source device is introduced is defined between a rear end of the main body portion of the pressurizing piston and the housing member. The input piston is fitted in the housing with seals, whereby, the input piston and the pressure receiving piston face to each other through the opening, though the input piston and the pressure receiving piston are not fitted to each other with any seal. |
