The component with the lowest price in the REAR BRAKE CALIPER schematic is the Bolt, Hexagon Sock.
The Rear Brake Caliper is made up of components including this Disc, Rear Brake 2 which is the most expensive.
A sample from the products for the Rear Brake Caliper include: Brake Pad Kit (nas), Bolt, Hexagon Sock, Spring, Pad, Caliper Assy, Rear.