2012 StreetGlide - When I use the brakes, either front or rear, I get what seams like an Electrical Buzzing Sound when applying either brake. It was happening for a while, a few weeks, then it goes away. It came back again and is louder this time. Harley says my bike is not on the recall list for the rear bike brake switch, but it does it when either brake is applied.

 

What you are hearing are the brake pads going over the holes that are drilled into the rotors on both brakes. It's nothing to worry about as long as the pads are in good shape.