Remove two bolts from the calliper and set them to one side.
Two bolts need to be removed from the positions shown.
The calliper attaches to the inside of the frame as shown. The barrel adjuster (circled) should be pointing upwards.
The holes will line up with the bracket on the calliper.
Carefully thread the two bolts through the frame and into the bracket on the calliper.
Loosely tighten up the two bolts. The bolts go into slots to make it easier to install the rear wheel. We will tighten them at the end of the build process.