Parts such as the Rear Brake Caliper: Piston, Cap,bleeder, Bracket Comp,rr C, Spring,pad are included in the St1100a Paneuropean 1994 (r) European Direct Sales / Kph Rear Brake Caliper parts fiche.
The most reasonably priced component used on the St1100a Paneuropean 1994 (r) European Direct Sales / Kph Rear Brake Caliper is the Screw,bleeder.
In this schematic the "Seal Set,piston" is used most often.