Noise when braking and coming to a complete stop. on 2008 Mercury Mariner

There is a loud creaking sound coming from my back right brake. It doesn't make the sound all the time and I don't think it is the pads because it doesn't start until the last few rolls of the tire when stopping. Any suggestions on what to check?

1 answer 1 comment
Was your parking brake on?
no, I don't even know where my evergency brake is... lol never used it.