[Bruce Edwards]

If that is the case you must have a rough spot on the brake pad surface. Pull the pads and sand them with some 80 grit to break the glaze on the pad surface. Use a bit of 220 and go over the rotor to give it a bit of roughness. Again you just want to break the glaze not reshape the parts. Check the backing plate on the pads. Look for uneven wear. A dished area on the end of one side of the pads shows uneven pressure on the pad.
All OEM pads now come with a anti-squeal insulator between the pad and the caliper pistons. The OEM part is a thin steal shim with an insulator on both sides.
Remember the pads must move smoothly in the caliper or it will hang and cause the pad to cock of center. Once that happens the caliper pistons will not press the pads evenly and you get a squeal.