Stopping distances should really be completely unaffected. I can lock 'em up from 70mph with the stock brakes equipped with even just decent pads.
The main benefit isn't stopping power, but the immense heat sinking capability of the bigger pads and rotors.
The extra stopping power and definitely the extra heat capability come into play when you have sigificantly more power than stock and you take your car to the track.
The S14 Silvia K's and S15 Silvia Spec-R came equipped with "300ZX brakes", stock...
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