OK, you don't seem to be understanding a very simple physics philosophy, you can have the biggest meanest drilliest venteiest cross sparkled brakes in the world but without a decent set of tires there will be no difference (not to be noticed anyway)...
The new brakes you have will be better from very high speeds, 120+MPH (Don't know what car you have at the moment so I am guessing at speeds) because they will dissipate heat faster and thus make it possible to keep on the brakes for harder, longer.
Look at it this way, the only part of a car that touches the road (unless you roll over) is the tires, upgrade them and you will feel a massive difference in handling, braking and accelerating under hard driving (OK, maybe not a massive difference in accelerating, but noticeable).
On the flipside to that though if you have just racing tires changed on the car, the braking from high speed will be good initially until the brakes overheat...
I will agree to disagree on this one, but in my honest opinion tires and brakes come hand in hand and shouldn't be looked at as seperate entities on a car, rather 2 parts that work together to achieve a common goal.