How to remove brake line nut without stripping?

Question

I started to remove one of the brake line nuts from the master cylinder with a box wrench and it began to strip on me.

I didn't let it strip much so I went and got some flange nut wrenches and it still started to strip on me.

What can I do to get it out?

Might I have to replace the brake line and the master cylinder?

I'm going to try repeatedly spraying penetrating oil on it and then cleaning it with brake cleaner once it gets moving so I don't contaminate the lines. Is that a good idea? If that method even ends up working at all.

Martin · Answer

For some real difficult line bolt I would suggest you either a plier wrench (http://www.knipex.com/index.php?id=1216&L=1&page=group_detail&parentID=1586&groupID=1500) or as a last-ditch effort use some vice grip pliers (ruining the bolt thereby).
Perhaps you want to use some gently applied heat (electric heat-gun)

Younas Chaudhry · Answer

For such scenarios, best is to hammer on nut but parllal to line using blunt piece of metal. I use a cut piece of
L-key. This being the most effective. If you use grip plier, probably the line will have to be cut, put a new nut and then get flared the end by some professional.

How to remove brake line nut without stripping?

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