tbh i would make a noise when im depressed lol. Is the noise coming from inside the car ie by the pedal or in engine bay. If its inside chances are you just need some greese on the pivot at the top on the spring.
think your need a second person to go round the car, to see if they can hear the moise coming from a caliper. It maybe just some dirt caught where the pads are mounted. does it do it with the engine off.