The lowest price component in this Front Brake(a7f/a8f) parts-list fiche is the Cap-breather.
Some items from this specific schematic: Spring,pad, Packing (nas), Piston-caliper, Bolt,flanged,10x35.
The Front Brake(a7f/a8f) assembly is constructed from several parts from which the Caliper-sub-assy,fr,l is the most expensive.