I'm looking for help. The disc brake on my 73 350F is screaching like a banshee. I've replaced the pads, still screaches, I replaced the rotor, no help. I replaced the piston (with a new stainless steel piston) and seal, no solution. I've mixed the old parts with the new in all different combinations and they still screach. I've tried to resurface the old rotor and pads with an abrasive pad. The bike only has around 3300 miles on it. Any ideas?