So, following on from this article on the new best ever brakes(TM) from Brakeforce one:
and the more technical detail here:
"The problem with standard disc brakes is that you have either a fast reaction time, or power, but you can't have both," said Wauhoff.
"This is because of the diameters of the pistons. I thought it should be possible to push the pads to the disc fast with a big piston and then get a small piston to exert a lot of pressure. I built a brake booster to test this theory. It worked."
Anyone have any suggestions how it's actually done - eg how are they getting the variable effective piston size so that they can move lots of fluid early on to get the pads to the rotor and then less once in contact to get more power?