Audi A4 B7 Quattro brake help!!!!

[Calasp]

could anybody on here help me
I have recently changed all the callipers on my B7 estate I’ve bled them over 8 times now and still get a soft pedal it’ll brake fine but then when held the pedal just hits the floor very slowly

Does anybody know what this could be

I’ve checked for leaks and even bled the abs under pressure with the pressure blender

I’ve had mechanics look at it and they don’t even know either it’s really annoying me now

Is it something to do with vagcom???

 

[Mazman]

If the pedal steadily sinks under constant pedal pressure I'd suspect the master cylinder seals or the brake servo itself. The master cylinder seals can let by under pressure without there being a visible leak out of the system. I'm 'surprised' your mechanic hasn't thought of these possibilities......