PLASTIC PRIMARY PISTON WITH INSERT FOR PENETRATION-TYPE TANDEM MASTER CYLINDER AND MASTER CYLINDER FITTED WTH SUCH A PISTON

摘要

A primary piston of molded plastic material equipped with a metallic insert and having grooves, mounted in a master cylinder comprising at least a primary piston and a secondary piston mounted in the bore hole of the master cylinder. These pistons can create pressure, respectively, in a primary pressure chamber and in a secondary pressure chamber due to the action of a push rod on the primary piston.