Parts such as the Front Brake: Bolt,socket,8x30, Boot,piston Seal, Holder-comp-caliper, Caliper-assy are included in the Ar80c8 1990 United Kingdom Front Brake parts fiche.
With five applications this Bolt,socket,8x30 is the most specified part.
The most reasonably priced component used on the Ar80c8 1990 United Kingdom Front Brake is the Cap-breather.