Pneumatic brake booster, particularly for a motor vehicle

摘要

A pneumatic brake booster for use in a motor vehicle having a feeler ( 42 ) mounted to slide on a plunger ( 32 ) located at the end of a control rod ( 22 ) and pivoting key ( 62 ) for axially blocking the movement of the feeler ( 42 ) with respect to the plunger ( 32 ) during a normal brake application and unblocking the movement during an emergency brake application to reduce the length of a plunger-feeler assembly and thus increase the jump phase of an output force.