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I'm not an expert on brakes anymore, but I will offer all I know.
Several years ago all brake pads and shoes were made mostly of asbestos. These linings didn't really have a very long life, and then asbestos was found to cause cancer. In an attempt to prolong the life of the linings, and do away with the asbestos, they started using semi-metallic, metallic, and ceramic materials for the linings. The more metal or ceramic the linings have, the more they squeal, especially when they get hot or dirty, and as the rotors and pads wear, they get a glaze on them that compounds the problem. Having the rotors turned, and scuffing the pads with very course emery cloth will stop the squeal for awhile, but in most cases, not indefinately. As I said, I'm no expert, and someone who is may have a better answer and cure for the problem.
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