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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.

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    Do you have the proper brake line wrench? Applying a little heat from a propane torch can help also.
    – Moab
    Aug 26, 2016 at 23:35
  • Isn't that the flange nut wrench?
    – ShaneBird
    Aug 26, 2016 at 23:35
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    Yes, but Cheap wrenches don't work so well, use a high quality brake line wrench.
    – Moab
    Aug 26, 2016 at 23:37
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    See my answer here.... mechanics.stackexchange.com/a/29475/16882
    – Moab
    Aug 26, 2016 at 23:55

2 Answers 2

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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)

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    penetrate oil will work when applying heat as it will be sucked into the threads.
    – Moab
    Aug 26, 2016 at 23:51
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    +1 for the Vice grips. Ive been there before and vice grips got hold of the nut securely and got it loosened without ruining it! (Ruining it any more than already had been) Aug 27, 2016 at 18:57
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    The bolt is not "fluid tight". It might be a frog butt, but it still will allow penetrating fluid to wick into the threads given enough time, heat, and/or vibration. "The fluid-tightness" comes from either a double flare or ISO bubble flare compression joint. The threads are merely creating the seating/sealing pressure, and are not meant to seal by themselves.
    – SteveRacer
    Aug 27, 2016 at 20:00
  • I've edited the answer. Thank you all for the correction
    – Martin
    Aug 28, 2016 at 6:55
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    Vice-grips are my go-to tool for this scenario. The important thing to remember is to tighten them just enough so they bite into the nut a little, but not enough to flatten or distort the line in the process.
    – barbecue
    Aug 28, 2016 at 14:27
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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.

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