Do Brave weapons work with Breaker skills?

To my knowledge, yes, it works. I don't see why it wouldn't.

It does work for sure, I use Lancebreaker on Reinhardt and Axebreaker on Cherche and can confirm it from experience.

However do keep in mind if the enemy can counter attack you, the combat will take place like this; You attack twice with Brave on initiation, enemy hits back, you attack two more times with Brave.

He was my defense for Hector in Arena with my Horse Emblem ofcourse now I have Calv. Lyn so I bumped him for her