Some items from this specific schematic: Washer(10x15x1.5), Union, Hose,rear Brake.
three components are shown in this Gsx1100e 1985 (f) (e01 E02 E04 E21 E22 E24) Rear Brake Hose exploded diagram.
Of all the components used in this assembly the Hose,rear Brake is the most expensive.