Of all the components used in this assembly the Sensor, Speed is the most expensive.
A sample from the products for the 029 Rear Hydraulic Brake include: Screw Tef M6x16, Spacer, Lever, Brake Master Cylinder, Spring.
The Copper Gasket 11.9x8.2x2 is the lowest priced item on this 029 Rear Hydraulic Brake schematic.