My 2008 edge 35k would make a very very loud howling noise from the left rear wheel after about 40 miles on the X-way, the rear alloy part of the wheels ( 20") especially the left side would be too hot to touch. Took it in under warranty and they couldn't duplicate the problem, 1500 miles later it started again and it was out of warranty I inspected the wheel and found the outside original fomoco brake pad "frozen" in the caliper assembly, the rounded edge was worn in at about at about a 15 degree angle same thing on the right. I had to hit them with a hammer to get them out of the stainless steel guides/track. the after market pads fit perfectly, no more howling, no more heat, problem solved. it was the pads being slightly to long/big to properly move as they are meant too. I happen to be on the mechanically inclined side but this problem was a no brainer for a Ford Tech to diagnose and correct.