I'm glad in a way to read of others with the same mysterious front end vibration at 80 mph in an W126 SEL. I have had new tires, new shocks, balanced & rotated a dozen times....very frustrating since most of my driving is on the interstate. Have also had new rotors, despite never having the pulsating brake problem. Am getting to the point of selling the car, and swearing off all S-class, as I understand the W140 has the same problem, esp early W140s. The vibration occurs right at the speed you want to travel. :-(

JoeB