Master cylinder comprises bore with primary and secondary sliding pistons, seals in contact with pistons delimit rear supply and front pressure chambers, each piston having drilling forming valve isolating pressure chamber

摘要

The tandem master cylinder (10) comprises a bore (14) in which axial primary (16) and secondary pistons slide. There are seals (48) in contact with each piston delimiting a rear supply chamber (56) and a front pressure chamber (58). Each piston comprises a drilling emerging in its periphery and in its bore (78) which forms a valve (82) for isolating the front pressure chamber when it clears the seal and thus allows the establishment of a braking pressure. The front pressure chamber of each piston comprises a tubular element (90) which can be disengaged inside the associated piston and which extends axially behind the seal in order to seal the drilling along its reduced travel.