Front disks acting weird.

[GM-power]

I don't know what is with me and brakes lately, but my disk brakes(pretty sure) are making this odd sound kinda like wwwwmmmmmmm wwwwwmmmmm( haha im not crazy). This only happens around 10-18 mph follows by the disk letting a squeak out. Brakes feel normal, stops great. Now this happens when I ease onto the pedal, but if I quickly apply force its doesn't make that sound, but does squeak. Replaced my squeaky worms belts the other night now the brakes are driving me insane. Ideas? Thanks in advance yall.
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