i have this exact problem too, and it usually just squeeks until i get my foot all the way off the brake. i just bought the car nine months ago... got the front brakes changed last week. squeeked before, squeeks now.The pads may be glazed, only a quick squeek, or does it stay?
This happened with mine, and that fixed it. This sound is very high pitched.You need to take off the rear drums and clean everything inside with brake cleaner.
Then lube the hell out of all the contact points, and this fixes the problem.