you can get anti squeal spray that you spray on the back of the pad (it drys) and that stops squeals sometimes.
if they're comp pads there going to squeal and theres nothing you can do about it but if there squealing with no pedal pressure theres something else touching, to totally eliminate the pads buy some cheap cheap pads and wack them in and see if the noise stops and go from there.
sometimes chamfering the outside edge of the pad can stop squeals too.
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