Thanks guys
More stuff to add to the TPS shopping list! I have a pressure bleeder so all good there. I'll report back on how it behaves once its all back together.
I've never seen the additional pump on ABS/ESP systems before either. It seems particularly out of place considering my 2001 A6 also has ESP but everything is contained in the one ABS unit. It leads me to wonder if the A6 unit could be transplanted in to a D2 to simplify the system. Its just sensors and can-bus right...? Maybe I'll try that if it explodes when I do basic settings
