I did not think I needed larger brakes untill the following:
1) Modify your engine so your making over 400rwhp. (Easy, many on here are there and more.)
2) Drive a few passes inside of a mile each where you go from 0 to 140ish back to 0 again. (mine lasted for 5 miles of this, then NO BRAKES.)
OK, to all the naysayers, drilled rotors, super carbon ceramic pads, new fluid, magic fluid or whatever you think will work, the only upgrade is an increase in overall swept area, and thermal sink/dispersant. (Surface area.) I had Axxes metal master pads, newer fluid and perfect rotors. Actually, they are still fine right now.
So, tooling along at 140mph, coming up to a stop sign, push on the brakes, nothing.. Really nothing at all. Pump them, slight decrease in speed, but not much, downshift to 4th, then 3rd, overrev the motor, don't care, there's another car coming, and he has NO stop sign... Standing on the brakes with both feet, pushing as hard as I can, barely slowing down, downshift to second, not going to make it, going to blow the sign, and get hit, see the eyes on the guy who's got the right of way, his eyes are as big as saucers, and he's hitting the brakes, I notice the nose of his car dive as my car runs the intersection and finally comes to a stop almost through it.... Wheh! That sucked.
Then the burning smoke cloud catches up to the Supra, billows into the open windows, and chokes my Brother and I as we waive to the guy who stopped, and thank him for not T-boning us as he could have...
Get out and check the FIRE in the brakes, then decide to just drive slowly on them to cool them down, smoke stops, and after a while, they start to work again. Never warped them, and the pads still worked fine, but it was only a short time later I bought my BBK for BOTH the front and rear brakes. Never going to allow my need for power and speed overcome the ability of the car's brakes to slow the vehicle down.
Specs.
14x1.38" front rotors on alloy hats. Clamped by Wilwood GNIII 6 piston calipers.
14x1.25" rear rotors on steel hats with custom drums for the stock parking brake clamped by Wilwood Billet Dynalite 4 piston calipers.
Fade is zero. Never have been able to smoke them yet. Multiple stops from 140mph, just stops, and if anything get's better as they heat up.
Bought the brakes from PB, but would not reccomend them to anyone as the service after the sale, and the time needed to get this kit made up was not acceptable. I'm going to have to custom balance the front rotors as they are not true, and also they "pulsed" from the start, and my attempts at cleaning them up have only dented the problem, not fixed it. (Going to turn the rotors, and have them balanced. After installing the brakes, I picked up a vibration at highway speed. So much for CNC control, and balanced rotors. The brake bias front to rear was one of the few things PB got right. It's perfect. Also the hardware is top notch, but the brake lines SUCKED. Sucked is not even what you want to say when you spend over 4500.00 for brakes on your car. Hint Hint PB. Don't make shitty lines for quality brakes or you'll never hear the end of it.