BRU security
BRU security is like AMS. You go through the initial screening and passport control then UA departs from A gates in the non-schengen area and there's another screening for that by the gate. It's very similar to AMS with the multiple screenings for US/Israel departing flights.
If you're flying in C of F you can get a fast-lane sticker on your bp from checkin and you can go through the fast lane. IME that's pretty quick.