Depression-type amplifier for boosting the braking of a motor vehicle and comprising an improved valve seat

摘要

A braking amplifier for a vehicle, comprising: a depression chamber (10); a working chamber (12); a shutter (30); and an intermediate chamber (64) communicating with the depression chamber (10) and forming a seat (52) for the shutter such that the shutter is able to place the intermediate chamber in communication with the working chamber and to prevent this communication. The seat (52) is formed by several separate zones arranged around an axis (6) of the amplifier.