leaking fluid question

[baddz]

Hey all, I was crawling under my 2005 470 today and noticed what appears to be leaking brake fluid at the coupler (is that the right word for what's in the pic) sort of behind the drivers side front wheel. Ive noticed zero difference in braking since I first got it. Id like to know if anyone else has this issue, if its truly the brake line, and if its difficult to fix. Thank you for your advice