How would you say "my theory would absolutely break down" in french?

Google translation gave me this "ma th茅orie serait absolument briser" but I know that briser means broken and not break down. How would you say break down in french? What is the right way to say it in french?|||Ma th茅orie s'茅croulerait compl猫tement|||ma th茅orie d茅composerait absolument