I just changed a set of Black Diamond discs and mintex 1144 for my Legacy and done about 300miles with them. They are a huge improvement over the standard discs and they only just slightly squeak when applying to them, it goes away if I press harder.
However, I am now getting a squeaking metal on metal noise when just going forward without applying brakes. It is only on the right side and my garage told me that it was due to the layer of wax on the discs (the black colour) not being removed yet. He says it should go away after a while. Anyone know if he is correct? The funny thing is that it only happens on one side, it's definitely not a wheel bearing noise.

 

BB..

Did you apply some copper grease to the metal backing plate of the pads where they come into contact with the Caliper/Piston.

I've found this very useful in curing squeal problems.. I fitted Black Diamond Discs & Mintex 1155 pads a few months back and they took about 500 miles to bed int properly, do a bit of gentle left foot braking whilst acellerating.. Heats the pads up and will hopefully bed them in quicker.

O.M.

 

Do the pads still have the anti squeel shims on the back?

They should have been cleaned and a light smear of copper slip (Anti-seize compound; not actually grease), should have been applied.

Also a slight chamfer on the leading edge of the pad can sometimes help them to bed in easier. (There is no wax on the pads from the factory).