Jeff, I encountered the same problem on my n2012 Roadster. The tube I believe you're referring to is actually a two wire sensor wiring harness that is encapsulated in plastic tubing and is attached to the front break fluid tube with plastic clips. I found the pinched section actually pinched and cut the wires inside. So I had to splice each wire to its mate (white to white, blue to blue) using but splices, and I relocated the wires to the lower side of the plastic side cover so they wouldn't contact the pinch point anymore. No more abs light. Hope this helps.