The wrench you need is often known as a "heat wrench". Yes a torch! A good oxy-acetylene torch carefully used will get these fitting a part easily. When heating the hose connections plan to replace them just in case. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Mike Riley
Sent: Wednesday, July 10, 2013 1:04 AM
To: vanagon@GERRY.VANAGON.COM
Subject: 11mm brake line wrench

I guess I need to clarify  things a bit. I have several sets of flare nut wrenches and get no joy from them. The problem is not twisting the lines but  breaking the nut loose without rounding it off. Tried several sets and all the same, they spring open when subjected to the force needed to break the nut loose. The nuts have had a bath in penitrating oil to no avail. Sometimes they warp the nut instead of rounding it off.  I have had sucess with carefully using vice grips but don't like it as it is very easy to mangle the nut. need  some kind of wrench that closes the gap.
mike