If you have a 109 with the dual cylinders, then chances are it is air. They are noted for being hard to bleed. I finally gave up on my 109 and reworked the piping. Now the pipe goes into the bottom cyclinder, then up to the top cylinder with the bleed screw on the top of the the top. It now bleeds like an 88". The only disadvantage is that you have 2 pipes exposed on the bottom of the axle. I put them so they are running side by side using the idea that if I were to rip one well then the second one being beside it would not matter as I already would have no brakes on that side. (I also keep a ten penny nail to put in the flex line incase this happens to block off that side, just incase I need brakes on the way home) .
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Andrew Barr.
1972 Series III 109.
"the Tin Turtle"
"However, that was his ploy and I caved....totally caved...   LOL!" Jellijo 
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