We are having problems just like you. On our '49 Chevrolet convertible, we used Dot5 fluid. We have all new brakes front to back. Just sitting having never been used the fluid is weeping out the master cylinder. We thought it might have been overfilled but it continued to leak. Even after removing some fluid it still weeps. Granted I'm not talking much but it kinda makes me mad when we have gone to all the trouble making sure everything is perfect. The only thing we can think of is it's the Dot5. 
Bruce yes, very strange huh ? i hate leaks, and since everything is new it should not be leaking.
i just checked, and i am running the new prestone synthetic DOT 3 fluid.
does that sound correct ?
thanks guys...
leonard
