| 摘要 |
The present invention is directed to a master cylinder provided with an annular seal member (S 1 ) having an annular groove of U-shaped cross section formed on its one end face, and a substantially annular seal retainer ( 30 ) for restricting at least axial movement of the seal member, and including a substantially annular lifted wall portion ( 31 ) formed to extend axially into the U-shaped annular groove of the seal member, and a substantially annular step portion ( 32 ) formed on an inner periphery of the lifted wall portion, for contacting an open end face of the seal member. The seal retainer is reduced in diameter by radial pressing force produced when it is received in a cylinder bore ( 1 ), and restored when the pressing force is released. The seal member is placed in an annular hold groove ( 1 d), and the seal retainer is received from an open end of the cylinder bore to be placed in an annular transfer groove ( 1 b), with the seal retainer reduced in diameter. Then, the seal retainer is transferred from the annular transfer groove to an annular hold groove ( 1 c), and the seal retainer is restored in such a state that the lifted wall portion extends into the U-shaped annular groove of the seal member.
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