Did you install ceramic pads? If so, they can squeak.
I haven't installed pads on my bike, but when I do my car and truck! I use CRC anti squeal between the calipers and pads.
Also, if you got any grease on the rotor, that will cause a squealing noise. If you think that's the problem, clean your rotors with Brake Clean or some type of brake cleaner.
I am assuming your bearings are OK.
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2013 FLTRU, Jackpot 2/1/2 Stainless Ceramic Coated Head Pipes, Fuelmoto Stage 1 Intake, Power Vision, Jackpot Full Size Ceramic Crossover, MADSTAD 16" Windshield, Motolight Running Lights, Nostalgic Rails, Airhawk R, Hayden Primary Tensioner, V&H Roland Sands Slant Slip-Ons