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Karl, did you use some of that blue disk brake adhesive stuff? I always glue the pad to the piston so that the pad gets puller away from the rotor as you let up on the pedal.
The way I understand it is as you let up on the pedal, the piston seal returns to it's original shape which pulls on the piston ever so slightlyback into the cylinder bore. When the seals get old they lose thier elasticity and don't retract as good. Plus you most likely had to push the pistons back in so now the seal is set on a different spot on the piston.
By the way the missing spring thing could do it also as it helps keep the pad square. The squeal is more of a high frequency vibration.
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