I have a 1989 chevrolet S10 Blazer 105,000 with a 4.3 L V6. Two days ago my girlfriend drove it 3 miles up the road with the park brake on and the next morning we noticed kind of a scraping/ wind catching sound, there is a rust hole right at the wheel well and at first I thought it was the wind catching it and I just never noticed it before because I have only had it a week but I noticed it doing it in the McDonalds drive thru, so it coudn't have been the wind... got any advice...