If you don't have a flare wrench, use a box end wrench to break the nut loose. You should be able to break it loose and close it again without hardly any fluid getting out. Then put your bleeder hose on and use an open end wrench.
The chance of stripping it should be lower with a box end, but you might drip a little brake fluid.
*Edit: NM. I thought we were talking about bleeding brakes. This is about removing the brake lines.
Last edited by Cazz; 12-31-2012 at 12:31 AM.