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Do not apply paste to caliper pin. They are not meant to be greased and adding ANY lubricant to the guide pins will result in them binding. I know it sounds counter intuitive, but the ONLY time they should be lubed is when applied in a solid guide like a brass guide. Then you need to clean them and lube them regularly.
Race pads squeal even when coasting when they've got a few events on them, when a few mm of material has been worn away and if one side of it is caught on the caliper carrier, causing the leading edge of the outboard pad to drag against the rotor even when the brake pedal is off. Japanese floating calipers usually use an aluminum or stainless steel "spring guide" in the carrier, but BMW carrier do not. One way to alleviate is to put anti-seize on the "ears" on the pad backing plate to prevent it from catching the caliper carrier.
Still, don't expect it to last long, and don't expect it to be completely quiet. Wear it like a badge of honor.
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