Pista front disk brake

Jacksons are right disk brakes are pointless if you are using 700c tyres.
it's a solution to a problem that doesn't exist.

is it purely for vanity or is there a particular reason you want to fit one? like you weigh 20stone and live at the bottom of a big hill or something?

Anyway, as is demonstrated here time and time again, when it comes to bikes all is vanity.