First off, who rebuilt your wiper motor? And no, if it's leaking
down then you have a vacuum leak, it's not sealing somewhere in
the circuit.
If it was simply taken apart, cleaned and the old power
piston/flapper re-greased, then it's going to leak. This is
what many people call "rebuilt". A proper rebuild installs a
new seal on the power piston/flapper and "new" gaskets. As far
as I know, the only one that still has any of those parts is
The Wiperman and they do not sell any of the parts for you to
rebuild them yourself.
I've tried:
http://www.pbase.com/dennygraham/trico_wiperhttp://www.pbase.com/dennygraham/spare_tyco_vacuum_motor&page=all Denny Graham
Sandwich, IL