The component with the lowest price in the FRONT BRAKE schematic is the Cap-breather.
Check out any of the eighteen Front Brake components enlisted.
Parts such as the Front Brake: Boot,caliper, Breather-brake, Pad-assy-brake (nas), Packing,piston (nas) are included in the Ex500d2 Gpz500s 1995 United Kingdom Sd Front Brake parts fiche.