Is the ABS unit made by Bosch? I found a Bosch ABS "kit" where they offered free software to interface to that kits parts. It has the bleed routines for linked and non linked ABS. If one knew the protocol and commands, they could make a dedicated device to trigger those bleed routines. I can do some microprocessor programming, but I have no idea what the comms are to that ABS unit. I've got to wonder how many out there have air in them, or old fluid trapped in the middle of the system so to speak. I don't see how going out and simply skid-activating the ABS would push any (much) air out, especially if the rest of the system is all buttoned up with clean new fluid. What I gathered from that kits docs is the slave bleed valves were opened to run the routine. Presumably so it can push fresh fluid through the system.