Ideally you want a master cyl piston area to cumalative caliper piston areas of 27:1 down to approx 23:1
Any less than this the lever is very hard and you have no feel for modulation, that lack of feel can also give a switch like tendancy to lock up the front.
Liken it to squeezing a rubber ball as against an egg, you can modulate the ball pressure easily but the egg through lack of feel just gives.
I was running a 916 I think master with one disc, yes it stopped but the lever was very hard. I have 4x34mm pistons in the caliper. I did the sums and I was at 13:1 ratio. So I now have a master with a 14mm piston this gives me a ratio of 23.6:1 and the modulation is great, trying it around an industrial estate.
Oulton will be tried in anger.
