| 摘要 |
A clutch hydraulic slave cylinder (16) comprising a cylinder body (14), a primary piston (41) sealingly reciprocable relative to the body and co-operating with the body to form a first fluid chamber (60) within said body, and a secondary piston (70) sealingly reciprocable relative to the primary piston (41) and co-operating with the primary piston to form a second fluid chamber (80). The second fluid chamber (80) is connected to the first fluid chamber (60) through a valve means (82). The primary piston (41) is biased by spring means (54) from a fully retracted condition to an "at-rest" condition in which it can exert a pre-load on a clutch bearing, and said valve means (82) is open when the primary piston is in the fully rectracted condition and is closed when the primary piston (41) is in the "at-rest" condition.
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