Parts such as the Front Brake Master Cylinder: Diaphragm, Bolt, Sealing, Clamp,brake Hose, Joint Assy,3-way are included in the Cx500 1981 (b) England Front Brake Master Cylinder parts fiche.
The component with the lowest price in the FRONT BRAKE MASTER CYLINDER schematic is the Screw Wash.,4x12.
With twelve applications this Washer,oil Bolt is the most specified part.