Squeaky wheel

[Bipotey]

Both front wheels squeak when in a central position. This stops when you touch the brake. I have tried copper slip on the back of the pads and this did nothing. Im really stumped as to what this could be. Can anyone shed any light on this?
thanks

 

[danward]

Seized calipers? Or maybe not a brake issue - wheel bearings?

 

[Bipotey]

Thanks for replying. The brakes work fine so i don't think there is a problem with them. And doesn't sound like a wheel bearing. The outside of the disc has some corrosion on, could this be a cause?