Insert the anchor nut into the backside of the fork’s brake mount bore until it bottoms out. Hold it in place with a 5mm Allen wrench.

Make sure that you have any washers required for the install in place on the brake anchor post before you start.

Then insert the brake anchor post from the front until it bottoms out and makes contact with the nut.

The distance between the brake body or washer, if you are using one, and the fork will tell you how much thread engagement you will have when the brake is installed. Make sure this distance is at least 10mm. If it is less than 10mm, you will need a longer nut.