It has been over 25 years since Porsche introduced the water-cooled engine in its 911 sports car ... a 3.6-liter flat-six engine that pairs with an electric motor in the Porsche Doppelkupplung ...

The Mercedes system replaces calipers with a circular brake pad mounted on the electric motor’s output shaft. The pad presses against a stationary, water-cooled ring within a sealed enclosure.

It has been over 25 years since Porsche introduced the water-cooled engine in its 911 ... a 3.6-liter flat-six engine that pairs with an electric motor in the Porsche Doppelkupplung transmission ...