apparently, my passenger rear brake isnt working. i took it off tonight to inspect it, and it looked nothing like it should. it was covered with dust, and it was very slightly rusty. The brake on the driver side (rear), i didnt take it off because i didnt have any time, but it has been grinding for about two weeks now, i was wondering...could the brakes on the right be out of adjustment? or does it sound like something's broken?