Abstract: A tandem hydraulic master cylinder having body (1) pierced with a bore having first (2a) and second (2b) inlets for receiving hydraulic fluid at low pressure. A primary piston (3) and a secondary piston (4) respectively slide in first (S1) and second (S2) length sections of the bore of body (1). A primary pressure chamber (5) is located in the bore between the primary piston (3) and the secondary piston (4) and a secondary chamber (6) is located between the secondary piston a bottom of the bore. First and second upstream and downstream sealing cups (91a,91b) and 92a,92b) respective seal the bore and the primary chamber (5) and the secondary chamber (6). The primary chamber (5) has a first re-supply duct (21) and a first outlet orifice (41) and the secondary chamber (6) has a second re-supply duct (22) and a second outlet orifice (42) for receiving and communicating hydraulic fluid.

Abstract: A method of setting a gap between a poppet member and a seat in a check valve by sensing the position of an cylindrical projection extending from an end cap while sonically welding the end cap to a housing