Have you bled the master cylinder itself ? Some even have a bleed screw on, but for those which don't, you can still do it by loosening the pipe (obviously put something under it to catch any fluid that escapes.)
On the basis that air floats to the top, it can be hard to get all the air out of a pipe that goes downwards. I spent 3 days trying to bleed the brakes on a Transit once, and similar on a Cavalier. If you can bleed it from near where it is (assuming there is any near the MS), it might make life easier.
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Recreate a visit to the homeopath by simply drinking some tap water and throwing £50 out of the window
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