not so super...
I was looking for pics of my Hope Moto brakes for a thread in the 29'r forum and ran across these, Hope XC4 circa 2k. Hyd disc brakes have come a long way. As the fluid heated up in these you had to turn the knob on top of the reservoir to increase it's size. Once it cooled down you would slide your thumb up to the dial again and close it so the pads actually touched the rotor.