I'm glad to see responses on this from experienced folk. I just delivered a couple of bikes with brakes that squeal. Brakes stopped the bikes just fine but were noisy. I did just about everything, save changing pads, which the customer would not go for. I explained all this to the customer and he was ok with it. I hate being presented with problems that I can't solve. I've been told in the past by professionals that some brakes are just noisy and there is little or nothing that can be done. So be it..