I have a barbarian with Unexpected Strike. He frequently wields a lucerne hammer, which has the brace property. If I'm raging, wielding the lucerne hammer, and someone charges me, should that qualify as bracing?
(I know it doesn't by RAW.)
I have a second Unexpected Strike question. If I ready an attack, can I take my readied attack and my Unexpected Strike attack?
You know it doesn't by RAW, but ask anyway? No, it shouldn't. Bracing requires a ready action. There is one fighter archetype which lets you brace as an immediate action. He trades weapon training at all times for weapon training when bracing for it.
If you ready an attack, yes, you could take the readied braced attack (condition being they charged into your reach) and then the unexpected strike (based on the AoO from the ability).