| 摘要 |
A tubular member 21 is disposed within a valve body 6, and has a resilient retainer 69 mounted around the outer periphery thereof. The inner periphery of the valve body 6 is formed with an annular groove 68. When a brake pedal is quickly depressed, an input shaft 23 and the tubular member 21 are driven forward through more than a given stroke relative to the valve body, whereby a projection 69a of the retainer 69 becomes engaged with the annular groove 68. This produces and maintains a large opening in an atmosphere valve 32. Accordingly, an output from a tandem brake booster 1 can be increased immediately in response to a quick depression of the brake pedal.
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