| 摘要 |
PCT No. PCT/FR97/00851 Sec. 371 Date May 28, 1997 Sec. 102(e) Date May 28, 1997 PCT Filed May 14, 1997 PCT Pub. No. WO98/05541 PCT Pub. Date Feb. 12, 1998A pneumatic brake booster comprising two working chambers, with each working chamber communicating a respective one of two reaction chambers. A divider dividing the reaction chambers provides a pressure feedback force to an input shaft. A selective valve (13) allows communication (C2) provided between the rear working chamber and the front reaction chamber to be closed, at least partially, when an airflow from the rear working chamber towards the front reaction chamber is higher than a predetermined amount. This allows the response time of the booster is adjusted.
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