Bleeding brakes on A6 Quattro

[Richard Hoffman]

Hello!
About 2 weeks ago I did a brake job on my parents 97 A6 Quattro Avant - new
pads, rotors, fluid flush/bleed.  Everything was in order and we bled the
brakes using the usual one-person-person-pumping, one-person-at-the-bleeder
technique.  The pedal felt a hair soft to me at the time.  Now it seems the
pedal is quite soft, seeming to need almost full travel to bring the car to
a halt - pretty consistent with needing to be bled again.
Is there a special technique required to bleed the brakes on the A6 ie:
vaccuum or pressure bleeding?
The next time I am in there, I want to make sure its the last time I'll need
to! (at least until these brakes are worn out)
TIA
Richard
1990 CQ 219k
1970 100LS 2-dr 46k

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