| 摘要 |
The present invention discloses a master cylinder MC, which comprises a body section 2, a cap 3, a cylinder housing 1 composed of the body section 2 and the cap 3, a sleeve 8 fitted in the cylinder housing 1, primary and secondary pistons 4 and 5 provided to be guided by the sleeve 8 and slid, first and second pressure chambers 9 and 10 and spring mechanisms 11 and 12 respectively disposed in the first and second pressure chambers for pressing the primary and secondary pistons 4 and 5 in returning directions. In the peripheral portion 17a of the spring retainer 17 of the spring mechanism 11 for pressing the primary piston 4, hook sections 17e are formed by protruding a plurality of portions 17d outward in an axial direction and then folding the tip of each of the protruded portions in a piston axial direction so as to hook the same in the outer peripheral surface of the sleeve 8. Thus, even if an excessive pulling-out force is applied to the primary piston, easy pulling-out of the primary piston can be prevented without deforming the spring retainer.
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