The 4-pad calipers will give you more stopping power. Used on the 998R, they are a significant upgrade to caliper stiffness along with the advantages in using one pad per piston.
The radial master will change the feel of the brakes by changing the hydraulic and mechanical advantage of the lever.
They do not increase stopping power.
Make the choice of either 18 or 20mm radial master carefully. The current after-market 19mm diameter master cylinders offer you the choice of a brake lever fulcrum-to-piston distance of either 18mm or 20mm. The stock Brembo lever has a 16mm dimension.
This different geometry means that the stock lever will need a lower pull force over a longer pull distance than the other two after-market MC’s to yield the SAME stopping power.
The 18mm lever will require 11% less pull force than the 20mm lever, but it also needs to be pulled through an 11% longer lever distance to get the same stopping force at the calipers. Conversely, with the 19X20 MC, you need to apply the highest pull force, but need the least lever movement to get the same amount of braking.
Some riders think that this short-pull trigger action means that they have "better" brakes, but they don't - at least not for street riding conditions.
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