Mark - There are a few things that it could be, but my guess would be that there is some room in one or more of your brake calipers for the pads to slide fore and aft. When you back up, the pads slide aft until they "bottom out", and forward when you then go forward. There is typically a small amount of drag between the pads and the rotors that can pull them a little. You can look carefully at each of your brake pad sets to see if one of them has what appears to be an abnormal amount of clearance between the pads and the calipers. This, of course, is a somewhat wild guess ... a close look at drive shafts, suspension bushings, etc. might yield some findings as well. Let us know what you find. Toby Peterson VIN 2248 Winged1 --- In dmcnews@xxxxxxxxxxxxxxx, id <ionicdesign@xxxx> wrote: > Sometimes when i am parked and put the car in reverse it will clunk when i back up, when > i go forward it will clunk again and then stop and not clunk again until i reapeat the > backing up and forward again. What could this be? > > Mark > 6683