| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the stopper pin for opening or closing the center valve of a master cylinder, which is used in an automobile brake system or the like, from falling from the master cylinder body. SOLUTION: A reservoir tank 2 is fitted, in its boss part 2a adapted to be fixed to a master cylinder body 1, with a check 24 that allows the flow of working fluid from the reservoir tank 2 to the cylinder body 1 therethrough and checks it when a stopper pin 23 is displaced at least by a predetermined distance, through the elasticity of a claw 24b against displacement. Even if the stopper pin 23 becomes loose and liable to fall from the cylinder body 1, the upper end of the pin 23 butts against the baseplate 24a of the check 24.</p> |
