Piston arrangement for an hydraulic actuating device of a vehicle

The arrangement has a stopper arranged in a recess of a piston for limiting an insertion unit of an input part (6) into the recess. An axial pressing force exercised on a tappet (4) for causing snap connection is smaller than the force exercised on the tappet for over sliding of the stopper in the recess. Another insertion unit of the part is limited by another stopper at an internal end of the recess.