i take it your only talking about light braking??
if so the problem now comes from the matter of having no asbestos in the pads to lubricate them - so under light braking there is a resonance squeal of metal on metal - you could take your pads out and chamfer the edges this would give you a smaller surface area and the "stilletoe" effect would apply more pressure to a smaller surface area and this would help- the reason the noise comes on after a few weeks is because the pads are treated with a repellant to prevent premature wearing "for storage" you can reapply a similar product but it softens the pads and they wear quicker and when the "lube" dries up/is used the sqeal will return
lots of manufacturers are having similar problems these days
hth
regards
Dez
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