| 摘要 |
A master cylinder includes a cylinder main body forming a piston mount space and a piston mounted in the cylinder main body. An auxiliary supplying/discharging passage communicating sideways with the piston mount space is provided at a longitudinally middle portion of the cylinder main body. The inner circumferential surface of the cylinder main body and the outer circumferential surface of the piston are shaped such that a communication path communicating a pressure chamber near a supplying/discharging opening and the auxiliary supplying/discharging passage is formed at the outer side of a seal ring mounted on the piston with the piston moved back to a rearmost position most distanced from the supplying/discharging opening. The position of the piston and the pressure in the pressure chamber can be stabilized when the piston is located at a rearmost position from the supplying/discharging opening.
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