| 摘要 |
A pneumatic brake-booster comprises a casing on which is formed a well (12) housing operating valve mechanism, a first wall (10) having at least one opening (14) cooperating with a mechanism for fastening the casing on a fixed part of a vehicle, a second wall having at least one opening cooperating with a mechanism for fastening a master cylinder on the casing, at least one annular member (16) being disposed in the casing, against a wall. The fastening mechanism consists of at least one projecting portion (18) of the annular member (16).
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