The reason I asked about the gravel road is because I drive down gravel roads a lot and one time my car started making a terrible grinding sound that appeared to be coming from the rear drivers side brake but only in reverse, it was quite in forward. I took off the tire and I found a quarter sized rock that had become lodged between the brake and some sort of shielding on the inside of the brake. for some reason it only made a sound in reverse.
I just thought I would tell you something that you could check out yourself without spending money on a mechanic first.
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