2001 TRX250EX Brake cam spins

So gentlemen,

I picked up a well used 2001 TRX250ex and it has zero rear brake action. I can spin the brake cam freely 360 degrees… Before tearing it open, has anyone seen something like this? Without opening it up I wonder if there are any brake shoes in there!? I am a total ATV newbie so lay it out straightfwd pleas… Thanks in advance guys

Scott