I wanted to see how much brake rotor glow I'd get on a full effort ~110 to 0 mph stop with my S4. Surprisingly not much! Only a little glow near the hat area and the rotor cooled right off. I'll have to try 150 mph next time. Brakes are Brembo 6 piston Porsche calipers / ECS 352 mm two piece floating rotors.