we allready bleeded the brakes twice, so not sure if "bleed" it again would work...

on another board i got the tip to bleed it with the contact turned on, but not with a running engine.
could that help? that would open the abs valves....?

 

What problem is there? I mean you bled them twice already, everything should be just fine. So is there a problem.

 

I heard from one mechanic, that bleeding the ABS unit is just like regular brakes, except you gotta _have the engine running_.