I recently replaced the front brake pads and rotors on my 2019 Edge SEL 2.0 Ecoboost. I found the 11mm Allen socket needed at a local NAPA store. Only about $3.50 including tax. It has a 3/8" drive.
As a side note, it turns out you can replace the pads in the caliper without removing the pins that use the 11mm Allen socket. My calipers just slid off the pins. The socket had to be ordered by NAPA and came in after I had completed the job. My pads and rotors had issues with rust not allowing the pads to have full contact with the rotors. These were the original brakes at just over 100k miles.
