Boiling Brake Fluid and Leaking MC Cover?

I had a disc brake vehicle have a wheel brg nut come loose, the discs kept the wheel/disc from coming off, and during long left turns would push the pistons in, and it took a pump to push them, (and the wheel I guess) back into position and get pedal.. That may also force fluid/overflow into M/C.. FWIW

I think you can get a 90* inverted flare fitting to move that tube, or remove securing bolt. and judiciously pry some clearance there, and re-secure.