| 摘要 |
The booster comprises a positioning member (24) for placing the distribution valve mechanism (12, 13, 14) in a specific rest position in the rest position of the booster, the positioning member (24) being coupled to one end (28) of a retractable elastic member of low elasticity (29), advantageously a spiral spring, which is deformable between a relaxed configuration and, in the rest position of the booster, a retractable configuration, in which the end (28) is located in a fixed reference position relative to the housing (1) of the booster, determining the rest position of the positioning member (24).
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