Patent ID: 7107768

Claim:
A hydraulic system comprising: a master cylinder having a housing, a piston axially movably disposed in the housing, and a piston rod, the piston bounding a pressure chamber filled with a hydraulic fluid, the piston upon actuation of the master cylinder being axially moved by the piston rod to pressurize the hydraulic fluid, the housing having a projection; a slave cylinder; a pressure-medium line connecting the master cylinder and slave cylinder; and an adapter for detachable connection to the pressure-medium line, the adapter including a sleeve made of a metal, the projection having a stepped bore with an opening for receiving the sleeve and having a first step and a second step, the first step having a diameter larger than the second step, the sleeve having a first region and a second region with a smaller diameter than the first region, the first region having at least a polygonal outer cross-section connected to the first step, the second region being connected to the second step; wherein the first region is further away from the pressure chamber than the second region.