I have a 2012 RTL which I bought used with about 8,000 miles and which now has about 18,500 miles. Yesterday I removed the front wheels to check the brake pads, they are about 1/8"-3/16" thick. Qusetion is, is it time to replace? I don't know if they are the orginal pads or not? What is everyone thinking on the min thickness of pads?