rear abs brake bleed problem K75

[bernoulli]

1994 K75RT with ABS.
Trying to bleed rear brake. I get no air bubbles from rear caliber, however I get plenty air bubbles from the ABS unit. After 15 minutes of getting bubbles, pedal feel does not improve, and the level in the reservoir does not go down, following the good directions in

. There is not enough pedal to activate the ABS even on loose gravel. 
I'm guessing there must be a air leak somewhere? Thoughts and comments appreciated.

[johnny]

are you bleeding slow... unlike a mash mash mash hold and open like a car... its open + slowly push... close + let up... repeat... also gotts to bleed abs modulator 1st... caliper 2nd...

do you still have the rubber brake line... if so... could be its just containing the pressure like it used to...

j o