Did you cut the rotors or put new rotors on, did you do all four wheels, also did you use cheap ceramic pads, These are all factors when doing a good brake job. ceramic pads will squeal if the rotors are not true or if they are cheapies one's. I just did mine last week with Bendix Ceramic pads and new rotors, they are perfect now, No noise or rumbling at all..
Good Luck my friend.....