In September 2012, I had all of my brake pads and my front rotors replaced. On at least two occasions since then, I have noticed grinding. I took the car back to be looked at in October and today and in both instances the mechanics couldn’t find a thing wrong with the brakes. On Saturday, I was driving more than usual and they were grinding the majority of the time. I’m not sure why this problem comes and goes and whether it increases with use over the day. I find it easier to replicate when coming to a stop in the street rather than in the driveway at a low speed. Has anyone else experienced grinding inexplicably coming and going like this? Is there something I ought to have the mechanics test out? In each of these cases, they have test driven my car, but at the same time, I don’t want to tell them “Try driving it for an hour”.
I drive a 2007 Toyota RAV4 (about 56000 miles on it) and while I am aware of grinding due to slight rust build-up, that issue usually clears itself up after the first few brakes of the day (I believe that this is a common problem).