Will Brambleclaw become leader in warrior cats?

Yes, Brambleclaw eventually becomes leader in the Warrior Cats series.

He becomes leader of ThunderClan after Firestar steps down, taking the name Bramblestar. This happens in the book "The Broken Code," the beginning of the fourth arc in the series.

It's a significant event in the series as Brambleclaw's journey to leadership is fraught with challenges, internal struggles, and a lot of growth as a cat.