The squeaking you’re experiencing will be the pads brushing the rotor at some point, so to cure it you’ll need to find out what’s allowing it to happen. Check your wheel’s fully in the dropout (if using a QR axle), and that the QR is tight so the wheel can’t move(check the rotor’s bolts too).Once that’s sorted, grip the wheel at the rim, and feel for any slight movement in the hub bearings that will allow the rotor to move side to side.Once that’s ok, sight down through the caliper, rotate the wheel, and check the rotor’s true,any side to side movement may cause contact(straighten using an adjustable spanner, or the correct tool), then check that the rotor is central between the pads in all planes, Avid’s CPS system allows for vertical, horizontal, and diagonal alignment(and mis-alignment too, unfortunately).Best method for this, is to loosen one end off, then loosen the other enough that you can barely move the caliper, and “walk” it into place a bit at a time by alternating which bolts are tight/ loose.