Got a Mk3 cabriolet, with a S2 lump in, and after quite a few situations of touching cloth ive decided to upgrade the brakes

sounded like a good idea, but i'm getting to my wits end now. The upgrade consists of a complete 2wd cossie set up, 4 pots on the front, and disc conversion on the rear. all fitted, all piped up, and connected to a 90spec 23mm master cylinder, all should of been well.

started the manual bleeding method, 25 minutes of pushing the pedal on the FIRST caliper and only an inch of fluid in the jar, i opted for an easy bleed kit, half an hour later they're all bled, used a litre of fluid, engine on, push the pedal, pedal hits the floor Driven it very briefly, and brakes do begin to come on at the bottom of the travel. feels like air....but ive bled them!

definately no leaks or anything as the pressure bleeder would have made them evident.

decided it must be the master cylinder, changed it, wasted another litre of fluid getting the exact same result.

a mate pointed out apparently its a common problem with rear disc conversions on RST's, and suggested dropping the calipers off to bleed them as they are too high. sounds feasable, just wondering if anyone else has had similar problems, or has got any sensible ideas?

Much appreciated if u can help, golden star to the best suggestion lol