There was a very in depth article in SCC this month that was focused on busting bad tuner info hype. Basically backed up everything Nose Nuggets is saying about brakes. Upgraded breaks are for resisting brake fade, not for stopping the car. The tires are the sole measure of how fast the car can stop assuming the brakes are not hot.
They even did a full array of tests on a Scion Tc brakes later in the magazine. Now, if you've seen those cars, you'll know that the rear disk brakes and pads especially are some of the smallest you'll EVER see on a car. They upgraded the tires and measured 70-0 stopping distance at 215 feet. Then they upgraded the disks, pads, lines, and fluid. Added roughly 20 pounds of unsprung weight, and tested again and it came out to 217 feet.
Now, of course those brakes would be rather overworked on a track car as they are tiney but clearly for stopping, stock brakes do just fine.