Patent ID: 7032498

Claim:
A braking amplifier for a vehicle, comprising: a vacuum chamber ( 10 ); a working chamber ( 12 ); a housing ( 14 ) for separating the vacuum chamber ( 10 ) from the working chamber ( 12 ); a shutter ( 30 ); and an intermediate chamber ( 64 ) located in the housing ( 14 ) and in communication with the vacuum chamber ( 10 ) having a rear section ( 50 ) whose end forms a seat ( 52 ) for the shutter ( 30 ), said shutter ( 30 ) selectively engaging seat ( 52 ) to interrupt communication between said vacuum chamber ( 10 ) and the intermediate chamber ( 64 ) and thereafter placing the intermediate chamber ( 64 ) in communication with the working chamber ( 12 ) to effect a brake application, characterized in that the seat ( 52 ) is formed by several separate circular zones ( 44 ) that succeed one another in a circumferential direction about a main axis ( 6 ) of the amplifier to define passages to provide communication between the intermediate chamber ( 12 ) and working chamber ( 12 ).