There are a few reasons why you might be hearing strange noises from your brakes. One reason is that the new brake pads need time to seat themselves against the rotors. It's like when you get a new Axe and the blade needs to be sharpened - the brake pads need to wear in a bit.
Another reason for brake noise is warped rotors. This can happen if the rotors were not installed correctly or if they've been damaged in some way. It's like when you try to put a square peg in a round hole - it just doesn't fit right. The brake pads and rotors need to be in perfect harmony for the brakes to work smoothly.
And then there's the matter of brake dust. It's like when you dust your furniture and it makes a mess - brake dust can cause problems too. When the brake pads wear down, they release tiny particles that can cause the brakes to squeal or squeak. It's not a big deal, but it can be annoying.
Brakes Squeaking After New Pads And Rotors | Detroit Chinatown