Grinding....wtf is that?

[DMan II-40]

I have noticed that when I am driving and start to slow down to come to a stop I hear this grinding noise from the back. I cant tell if it is coming from the left or right, I personally think it is my stock LSD making the noise but I have no idea really. Any input would be nice, thank you in advance.

[pflicht]

Um check ur brakes. If you got no pad left, the metal backing will start to grind the rotors. Happened with my corolla, the fronts... of course. Had to replace the rotors afterwards.

[Vegascorbin]

And when you go to buy the replacement rotor that you ground up get two. It is best to replace both sides at the same time.