I got a new master cylinder in the attempt to fix my brake issue, but I can't figure out how to get the brake lines off the damn thing. I don't have line wrenches and was trying with just a regular wrench, but those things are on there. I used some penetrating lubricant, but haven't had any luck. What size line wrench I would need? I've already rounded one nut, I can't do it again. I also don't have a bench vise, so I'm trying to get them off with the master cylinder still in the car. Thanks for the help guys.

Benji