Rear Brake Problems 5000TQ

[ricematthews]

Erik:
As rear calipers tend to be a weak link in these cars, that would be my bet.
Before replacing them, however, you may want to make sure that you don't
have any blockage in the lines by cracking the bleed nipples open and
pushing on the brakes to see if you get fluid bleeding out.
-Mark

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My rear brakes aren't engaging.  I have taken the
calipers apart and all seems well there.  I have
removed the rear proportioning valve.  I am at a loss,
if anyone has any ideas it would be greatly
appreciated.  When I stomp on the brakes the fronts
lock up right away.
Thanks,
Erik