Your right except that theres more load on the drilled ones....... The brake pad delivers whatever force the piston produces no matter what. With the drilled rotors you have less contact area with the rotor so lets say the Distributed load on the solid one is 50N/mm and the drilled one is 61N/mm multiply that time surface area to get equivelant loading. So lets say the Suface area of the drilled is 984mm^2 and the SA. of the nondrilled rotor is 1200mm^2. When you multiply 50N/mm^2*1200mm^2 you get 60,000N. When you multiply 984mm^2*61mm^2 you still get 60,000N. Conservation of engery. When you calculate friction, you have to use the equivelant loading. So its the same Ffr no matter what. All less SA. is doing is increasing the pressure on the rotors. Does that make sense Mustang5L5?