Wife just went to Dealer for an oil change. They said the right rear brake is worn down to the rotor. I think they told her the pad might have been caught rubbing. I'm guessing the guide pin is bad or stuck. They wanted $300 for new pads and to turn the rotor. I am just about to order 2 new Centric premium rotors and Akebono ProAct pads from Rockauto for $90. Any have any thoughts?