New pads and/or rotor? If so, you'll just have to let them bed in. Otherwise, have you checked that the inner pad is adjusted properly? Tighten it by a few clicks and it should eliminate the squeal. As only the outer pad moves when you brake, if the inner pad is too far back, the rotor will bend and meet the inner pad at an angle hence the squeal
New pads and/or rotor? If so, you'll just have to let them bed in. Otherwise, have you checked that the inner pad is adjusted properly? Tighten it by a few clicks and it should eliminate the squeal. As only the outer pad moves when you brake, if the inner pad is too far back, the rotor will bend and meet the inner pad at an angle hence the squeal