I had my ABS/Brake warning lights come on while driving my Z8. No problem with the braking functions, including the ABS system could be noticed. I took the car to my BMW dealer to have this checked. Dealer says the problem is a faulty ABS Return Pump. They cleared the code and it stayed off for a while but then the warning lights returned after a short drive. Dealer says pump cannot be repaired and must be replaced. Cost: $4,195.00 and the part must come from Germany. I am wondering if more driving might correct the problem and perhaps I should have the code cleared again. Again, no braking malfunction can be detected while driving. Everything works just fine. Has anyone had this problem? Any other suggestions for correcting this problem.