Going straight, does the noise change or go away if you turn the wheel gently to one or both sides? If it truly sounds like brake sounds that might indicate the wheel bearings are loose, letting the rotor move a little between the pads.
'91 Toyota Pickup
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
"To live is to suffer, to survive is to find some meaning in the suffering." -- Friedrich Nietzsche