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How did you bleed the system originally? Did you use the brake pedal pumping method? If you did and bleeding the system again doesn't improve things, then its possible that the seals in the master cylinder have failed. This can happen on older master cylinders that have corroded. Under normal use all is well but if you empty the system and refill it with new fluid then the greater pedal travel while bleeding causes rusted parts of the piston/cylinder bore to make contact with seals that normally wouldn't move that far. They get torn and fail sooner or later.
I've read somewhere that you're better off bleeding silicone fluid systems with some sort of brake bleeder that doesn't involve pedal pumping - the pedal pumping action can cause micro-aeration that makes a firm pedal much harder to achieve.
I'd be inclined to think that if you haven't lost any brake fluid then either you've air trapped in the system that's moved (maybe possible with an unbled corner? - I'm not sure) or else the master cylinder seals have failed. You'll know if the master cylinder seals are ok if you can get a firm pedal that lasts.
Aidan
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1967 131, 1969 131, 1973 Triumph GT6
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