The Rear Master Cylinder is made up of components including this Rr. Master Cylinder Assy. which is the most expensive.
In this schematic the "Screw(3ma)" is used most often.
Parts such as the Rear Master Cylinder: Cylinder Kit, Master, Circlip, Washer, Plate(481), Bush,diaphragm are included in the Tzr125 1991 3pb3 France 213pb-351f1 Rear Master Cylinder parts fiche.