Why is my right rear tire grinding when I apply the brakes!?

What is your question?

I have a 2005 buick lacrosse and everytime I slow down and am braking the wheel starts grinding like the pads are shot. Checked the brakes and there still 3/4 a pad. Not sure where to start.

What makes this problem better or worse?

Applying the brakes

How long has your 2005 Buick LaCrosse had this problem?

A week or two