VAGCOM is a software tool buy RossTec which allows you to tap in to the ECU and read and make changes to different aspect of the car and read error codes and clear them.
Has for the ESP I have never bleeded a car with it on so cant help much there but I would say doing the nipple may help with things but then you would need to bleed the system and make sure the breaks are OK.
Another option would be to clamp off the brake line and undo the brake line from the caliper and then try again but as stated your tool need to turn the caiper piston it's self as it will not push back but wind back.
__________________
 
OEM RS4 Body| RS4 front Brakes| RS4 shocks & H&R Race springs| RS4 Xenons| 18" BBS RC wheels| Scroll K04 Outlaw|RaceTec FMIC| Southbend StageIII clutch| Autobahn88 Silicon hoses| Baileys DV| Waiting to be fitted: TT MAF| 380 injectors| RS4 Rear brakes & a Remap
|