PDWA leak

[John Mitchell <jmitch@snet.net>]

Hi everyone, I just finished rebuilding front and rear brakes and 
replaced all hoses.  After bleeding, I'm getting a leak up though the 
brake switch on the PDWA.  It feels as though the piston is centered and 
the fluid is only coming from the rear brake(smaller) portion of the 
master cylinder.  Im soo glad I switched to silicone fluid!  Would this 
be an "O" ring problem or something else?    It didn't leak before the 
rebuild, but at that time the cylinder wasn't centered either.  Any 
ideas would be greatly appreciated.            TIA                   
John Mitchell    76TR6