On this parts fiche the Plug,pin is the most specified component.
The Front Brake Caliper is made up of components including this Caliper Assy,l Fr which is the most expensive.
Parts such as the Front Brake Caliper: Piston, Bracket Comp,fr.l, Seal Set,piston, Cap,bleeder are included in the Gl1500se Goldwing 1993 (p) Usa California Front Brake Caliper parts fiche.