[Vwdiesel] brakes

[cass]

hi all.

so.. symptom ...
 brakes are not strong.
will stop car..but hard pressure on pedal 
only gives gentle braking
cant lock up brakes.
~~
new master.
new rear slaves & shoes/drums
new front discs & shoes.
(calipers looked and moved fine..pins where clean)
evrything is nice and clean..no oil.
~~
system has been bled several times.
no bubbles.
i have vacuum(now)
pedal dose not change with pumping.
pedal is firm and holds position if i step on it
(doesn't sink)
its not loosing any fluid anywhere.
pulling the e-brake locks rears.

i do not know what this cars /chassis problems where 
when i got it as i never drove it.
could this be  the symptoms of the rear pressure regulator thing?
maybe the rear is turned up to high?
but then the rear should at least lock up???
or could i still have vacuum issues?
(even though when i pull the hose off the brake servo..i have vac there and the hose sucks
my finger well :o)

any thoughts?
thanks.
cassie