My 2008 Marine Master trailer has the UFP A60 surge braking system. Since last year, I'm getting this loud and very irritating rubbing noise every time I brake and every time I even hit anything but a mild bump. The noise is coming from the A60 brake assembly (or at least that's the location of the noise.) What could be causing this noise? I've completely greased up the areas for potential friction but that didn't change a thing. It doesn't sound like a metal-to-metal sound...it almost sounds more like a hard piece of rubber rubbing on metal. Could that little damper be shot? The spring? I do know my brake does not fully decompress when I detach the trailer. Should it?
I'll replace the entire A60 if necessary but want to diagnose the issue so I can avoid throwing parts at it. The trailer brakes work perfectly fine.