[jhv48]

You mention that you changed both the slave cylinder and master cylinder.

Are they the same sizes as the old ones (I believe they were both 7/8")? Make sure. If the new master is 3/4" and the slave is 7/8", you will experience exactly what you are experiencing. If they are the same size, then one or the other is most likely leaking internally. Put the original M/C and slave back on and see if the problem persists.

Is the foot pressure the same as before?