I replaced my brake pads yesterday,
I heard noise while riding it home its hard to explain the noise but it almost sounds like a bug hissing or something...

I hear it rubbing on my rotors while riding but its not constant, almost as if the brake pad is only rubbing a certain part of the rotor as it spins [checked rotors, no warp] then when I apply the brakes i hear the hissing sound but its constant as I hold the brake lever down, this happens at all speeds above 10 mph..Also with the bike off, i rolled it forward and can hear the pads rubbing the rotor a bit. I dont know if its just cause they are new pads but this seems unusual. I cleaned the pistons with contact cleaner before installing the pads and looking at the pads they look pretty snug on my rotor without applying the brake lever, maybe just the thickness of them? Is all of this normal?
Thanks for your time guys