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I am having the same problem. Just rebuilt the calipers with new seals to cure sticking pistons when not used for a while. Brakes worked OK, but thought I would refresh the seals. Reading some threads on bleeding I have not had the piece of wood under the pedal so may have damaged the master cylinder seals. But I'm getting air bubbles coming out of the bleed nipples after best part of 2 litres of fluid. Also after shutting off the bleed nipples I can get some resistance by pumping the pedal. If I keep my foot on the pedal it stays solid but as soon as I release the next application it drops to the floor. I'm thinking that there is air in the system but can't understand why I'm not clearing it. Beginning to suspect that it is being sucked in somewhere.
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1959 Bristol 406 (bought in 1972; sold in 1977)
1966 Porsche 2.0 coupe (bought in 1977; sold 1981)
1978 Porsche SC coupe (bought in 1993)
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