The squeal is a buildup of resin binder on the surface of the pads. Two solutions. Go to a softer pad, or try a couple of heavy "panic" stops to burn the glaze off. This is most noticeable with new pads, especially MBZ OEM's The Blue paste on the back of the pads is to lubricate the contact surface between the pad and the caliper piston. will eliminate noise associated with the pads "creeping" across the piston face and creating noises until they stop moving. The real troublemaker is on the other side of the pads..

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE