a clutch control device comprising a cylinder body and a piston axially sliding in an inner bore of the cylinder body and at least a dynamic seal borne by the cylinder body . the cylinder body comprises , axially arranged successively from the front rearwards , a blind front component comprising a base , a central component and a rear component open rearwards made of plastic material and assembled together sealed by welding with indirect heat input , and the inner bore comprises a front portion and a rear portion , and the dynamic seal is housed in the central component of the cylinder body .