The lowest price component in this Brake Pedal parts-list fiche is the Washer,8.5x16x1.2.
The Brake Pedal assembly is constructed from several parts from which the Lever-brake,pedal is the most expensive.
Some items from this specific schematic: Lever-brake,pedal, Nut,6mm, Washer,8.5x16x1.2, Pin-cotter,2.0x15.