If you are in the habit of 'comfort braking' then the pads & discs will be forever glazing up, de-glazing them will only last a short while, particularly if the discs have become discoloured (i.e. the metal has changed state / hardness). In my experience, most cases of brake noise due to glazed pads and / or discs is down to poor driving habits. The rest is down to contamination or the car being stood for some time - this will show up, particularly on the inner face, as pitting or 'Saturns Rings' of corrosion.
Also have a look at the brake discs, if there is a lip on the outer edge greater than 1.5mm, this can create a 'hot spot' along the edge of the pad, which will squeal when hot - but again, if the brakes are being over-applied, then the heat has nowhere to go....
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