Thanks for the help. This is what the dealer says: "Brake booster pressure switch short test performed - code C1406. Electrical system check/det condition - found brake booster pressure switch intermittantly open." They replaced the booster and a couple of ancilliary parts (not the travel sensor, though). Which brings me back to my question - does this make sense? I am just trying to understand the interface between the ESP and BAS systems and make sure that whatever the problem, it gets fixed right before my extended warranty expires next month. Also, maybe this thread will benefit someone else down the road. I did flog the car after I picked it up and it seems OK. But, the problem was intermittant, so who knows. Incidently, I had checked tire pressures, they were spot on. I checked the battery voltage and it was fine. I did not check the brake lights.