Just air in the system or a bad master cylinder?

[boston813roc at gmail.com (brad boston)]

The saga continues...

thus far in our story the shade tree mechanic (me) and his trusty side kick
(a friends that brings cold beer) have had no luck in getting the brake
system to work on my (now garage queen) '88 16v.

the Things that have changed or had done to it are as follows

Replaced the rear calipers with some sweet looking red powder coated ones
(thanks Peter)
  This got the E-Brake working and was the initial cause of this adventure

Replaced the front calipers with nice red ones so everything would match
(they look great on the car)
  Tried to bleed down the system but the pedal went right to the floor after
bleeding all four calipers :(

Though it was the master cylinder so I ordered a new one and some stainless
Steel lines just because I already had the system apart.

Tried to rebleed the system but again no luck

Asked for help and found that the master cylinder needed to be primed before
it is installed
  used a short piece of brake line and some tubing to bleed each outlet of
the master cylinder (This got a lot of air out)... But still the pedal goes
right to the floor

Tried to rebleed the system at all the calipers but still nothing

I am starting to think that I may not have gotten a good master cylinder or
that there is some air in the system that I was not able to get out even
with repeated bleedings

OK, so what do you all think?  Should I try rebleeding the master cylinder?
Try replacing the master cylinder with a known good one? (any one have one I
can borrow?)  Any other ideas or suggestions would be appreciated.

Tune in next week to find out if the shade tree mechanic will be ready to
take the scirocco out for the winter season of auto x.....

Brad