Join Date: Jul 2006
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Noises like this are difficult to diagnosed without hearing them. At the rear it could be loose or worn suspension fixings, worn shock absorber and/or bushes, or worn bearing. The rear discs might be sticking, or brake pads if you have drum brakes on the rear but they would not usually knock, just squeal. Only way to really find out is to put it on ramps.
You absolutely sure nothing is moving about inside?
Someone with greater knowledge will no doubt come along.
Hope you get it sorted..