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2birdman,
If PB Blaster or Liquid Wrench don't get the job done, you may have to resort to using a torch to heat the fitting up before putting a wrench to it. In some cases you need to be aware of internal parts that would be affected by the heat, such as rubber cups in the master cylinder, but you should be rebuilding the master cylinder with new innards at this stage anyway.
Good Luck, and keep us posted as to how you are making out with the project.
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