SteveTack
Member
The fact you won't notice a brake upgrade unless you're on a racetrack is true of virtually every modern car ever made.
In normal street use brake "upgrades" do literally nothing useful besides make eventual brake jobs more expensive (or more frequently needed for suckers who buy drilled rotors)
Yeah, bigger rotors are mostly about heat dissipation, which is something you don't typically need on the street (especially with Tesla's regen braking).
When I upgraded my front WRX brakes, it was so I could take it on a track that was especially brutal on heating up brakes. The pedal did have a much wider range of motion (better brake modulation), which could arguably be helpful off track in very specific scenarios. Not sure if the previous Model S "P" brakes have any different modulation; I'd assume it'd be similar on Model 3 "P" if so.