Back in 2010 I purchased a 2008 dealer closeout GL1800. I now have +10,000 miles on it and want to ask about the behavior of the brakes. Here's what' going on. On several occasions when applying the rear brake the bike has shaken as if driving over rumble strips. The shaking stops immediately upon activation of the front brake lever. This has happened at speeds as low as 30 mph and high as 65 mph. This bike does not have ABS. Also, when stopping on any uphill grade or coming to a quick full stop the rear brake pedal feels firmly down but then sinks slightly when the bike settles. I have had two dealers check the brakes and neither detect anything wrong. The bike was also checked for the brake recall (secondary cylinder?) but found not to have the problem associated with the recall. I don't feel like the brakes are unsafe but don't feel like they are "right" either. Anyone have any suggestions.