Brake booster having two amplification factors

摘要

The amplifier has an output unit (22) coupled to a piston (11) and a plunger (12) by intermediate of a reaction disk (23). A sleeve (42) is movable with respect to the unit between a decoupled position in which a clearance is arranged, and a coupled position in which the clearance is removed so that the sleeve makes a coupling between the front side of the disk and the unit. The sleeve has a receiving portion (45) for receiving the disk. The portion and the disk are cylinders of corresponding sections, where the portion slides with respect to the disk.