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theres a lot more that goes into a braking system than just calipers and rotors.
1) You have to take into account how hot your fluid is getting after 15 minutes of hard driving, and what temperatures it is designed to handle.
2) Also wether or not your lines were properly bled, and balance can be be greatly affected on wether or not you bled front and rear correctly and equally.
3) You also won't be able to brake as hard if your master cylinder can't push pistons on pads with enough preassure to make a large difference over stock.
4) Stock rubber lines are flexible, very flexible. If you run hot brake fluid through them, they will expand much easier than when the car is cold early on in the run.
5) And most importantly I'd say are pads. I've seen 10-30 feet cut off of 70-0 distances just with the addition of brake pads designed for higher heat and friction uses.
Get all the proper additions to your brake package and then you can make a fair judgement of it. I'd say with proper pads, lines, and fluid though, you should very rarely, if ever experience any brake fade over 20 or 30 minute track sessions, even on stock calipers and rotors.
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92 coupe, teh sex.
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