I noticed that a small amount of brake fluid is on the outside of the rear cylinder and collects in the plastic cover that surrounds the cylinder. The cap is on tight and the line is good. It seems to do this on longer rides. I check the fluid each time I ride and it shows it just below the full mark. Wasn't that worried but wanted to see if anyone else has this problem.

 

Hey, Chief! How's the retirement goin'?

While in a perfect world the master cylinder shouldn't weep, it ain't a perfect world. If it's buggin' you, try another cap, but if it's the master cylinder itself, that won't help much. If it is weeping as little as you say, I'd just shine it on.

EMC(SW) Poco