Horrible screaching noise from brake lines

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Alright, next Monday I finally get my new brakes and all that, but there's still one problem. When I press the brake pedal, it sounds like someone is scratching the absolute crap out of a chalkboard. Do I need to bleed my brakes perhaps?

It's not grinding the rotors or anything, but it seems like something in the lines. I can hear myself braking when I press the pedal, it sucks.

Thanks for all your help!