| 摘要 |
An improvement of a constant pressure passage formed within a valve body of a brake booster is disclosed. A notch of a given size is formed in the internal peripheral surface of the valve body at a location rearward of the rear end of the constant pressure passage. The provision of the notch allows the diameter of a reaction disc to be increased over the prior art by an amount corresponding to the depth of the notch, thus allowing the durability of the reaction disc to be improved.
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