| 摘要 |
A master cylinder with a stepped bore (14, 24, 26) and at least one piston (28) defining therewithin a fast-fill chamber (30) and a primary chamber (34), the fluid pressure built up within said fast-fill (30) chamber during a brake application being communicated to said primary chamber (34) as long as it does not reach a predetermined level and then vented to a fluid reservoir (16). In order to avoid a transition bump between the two modes of operation, the invention provides for an additional valving arrangement which gradually communicates the fast-fill chamber (30) to the reservoir (16) after a first stage of brake application. |
