| 摘要 |
A master cylinder piston, more particularly for a motor vehicle, comprises a flap (22), biased towards a position in which it shuts off a pressure-fluid passage (24), by means of a return spring (28) resting on a cage (30), which includes retaining means (38, 40) under a permanent set for their accommodation in an annular groove (44) provided in the housing (20) of the flap, when the cage (30) bears axially on an inner shoulder (64) of the housing (20).
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