I can say I have never seen a set of MB brakes smoke, but I have personally smoked a set of disks on a Crown Vic. After a VERY spirited run (60ish) up an 18% grade with multiple switchbacks, lasting about 6 miles, then a 5 mile full throttle run once I had straightaway (with hard braking action at each drainage dip commonly found in the desert), upon arriving at my destination I had heavy smoke coming out of all four wheelwells. The car is equipped with 4 wheel disks, upgraded with "The" package. The brakes smoked for a good 15 minutes before cooling enough to stop smoking. They were putting out enough smoke that I thought they might flame. I'm sure if it had been dark the rotors would have been glowing.
And yes, I did have some serious brake fade at the end of that run.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.