If you ride an R1150GS you should check your clutch hose connector where it joins the clutch slave cylinder for corrosion. The hose has a loose rubber sleeve. This sleeve can collect water and will rust the connector to the point where you will end up with a leak. Cut back the sleeve, so the connector is fully exposed. You'll need to do this next time have the rear tyre off, better even with the shock out. A new hose is very expensive!