I recently purchase a GMC Uplander Van. It came withh 65000KM on it. From time to time we are getting a strange noise when turning a corner or putting the brakes on lightly, although the problem occurs most of the time when turning corners.. When the noise does happen it is extremley loud and can be felt. It can be stopped by pressing the brakes really hard and releasing. From what I can tell the sound seems to be originating from the back of the van. (The van is front wheel drive). It can also be felt through the brake pedal when it is occurnig. The van has been checked by the dealership and of course it would not make the sound for them. They checked brakes and rear wheels and could find nothing. I thought maybe it was a dust cover that came loose but they checked for that to.