It is a very loud noise as if something is rubbing against the rotor. I checked the brake pads and they are fine, nothing metal stuck in them. The noise is present at all speeds and the noise pitch doesnt change when i apply brakes. What could it be ?

did you check the...o dam it i forgot what its called!! the metal dust shield thing behind the rotor. sometimes those get bent and rub against the rotor

Either that or it could be a bad wheel baring.

Don't remember it being close to the rotor, will check tommorow.

i have the same issue but in the back wheels,both of them. ive figured out that it is definitely caused (on my car at least) by the pads rubbing against the built up rust on the rotor. I sanded away the rust, and the sound got less noticable, but its still there, not nearly as bad though

Yeah i had the same issue and it was that the dust sheild that was slightly bent, hopefully thats the case for you, cause it is an easy fix.... good luck