Patent ID: 7137492

Claim:
Apparatus for controlling brakes in bicycles, to be used, in particular, for disc brakes mounted on bicycles, with a pump connected with a relevant reservoir for the fluid of the hydraulic circuit, and comprising a piston sliding within a relevant chamber provided with a plurality of ports for connection with said reservoir, said piston being so shaped as to close/open said ports upon its displacement along said chamber, the apparatus being characterized in that the idle stroke of the piston inside said chamber is adjustable by a rotation of the same piston about its longitudinal axis and in which the piston is provided with a gasket able to close said ports upon the stroke of the piston along said chamber, the apparatus being characterized in that said gasket has a circumferential development with differentiated height so as to offer, in correspondence of a rotation of the piston about its longitudinal axis, a different front of interaction with said ports.