Squealing Brakes Help

[thescamper]

SWMBO has an aging Reno Scenic which has had squealing brakes for a while, at the recent MOT it got an advisory that the front discs where thin and that the pads were about 85% gone.

I have,
fitted new mintex pads and discs
copper slipped the back of the pads
copper slipped the shims
cleaned and greased the caliper sliders,
rubber greased the slider seals and caliper piston seals

And the bloody things still squeal, I have run out of ideas of how to stop them has the pistonheads collective got any ideas?

Thanks in anticipation?

[thescamper]

Im convinced its the fronts, however my plan is to change the rears next month anyway.

[thescamper]

TallPaul said:

Chamfer the leading edge of the friction material.

The pads came with this already done.

Still convinced its the fronts!