| 摘要 |
According to the invention, a servo ratio regulating member is disposed on the front end face of the valve body for abutment against the rear end face of a reaction disc. The servo ratio regulating member comprises an engaging portion which is engaged with a portion of a reduced diameter formed on the front end face of the valve body, and an abutment portion continuing from the engaging portion and projecting forwardly for abutment against the reaction disc. An external diameter D'' of the abutment portion as well as an external diameter of the reaction disc which is seated thereon are greater than an external diameter D of the outer periphery of the valve element, reducing the proportion of a brake reaction which is transmitted to a driver. With this arrangement, a higher servo ratio can be established with an arrangement which is simplified and inexpensive as compared with the prior art.
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