So how much difference in stopping ability does changing the brake rotors actually make? Has anyone ever done any controlled tests with different rotors to see if there is actually a difference beyond brand name and appearance (cross-drilled, slotted, etc)? Inquiring minds want to know. :D

 

There are two different kinds of stopping ability. First time cold stop and repeated stops. Most modern brakes actually do a good job at cold stops. Upgrades like StopTech don't necessarily make your cold stops shorter but they do ensure consistent repeated stops. Street drivers don't need this; it's only when you're on the track that it becomes important.

And of course tires affect stopping distance and can mask brake performance.
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Rolls-royce 20 hp (1905)

 

The biggest difference comes into play with the slotted and cross drilling..this is where you'll see a gain in your repeated stops...the heat is able to be dissipated quicker...another factor is your 4POT and 6POT calipers...when doing an entire brake kit you need to purchase everything with a purpose...what kind of racing will you be doing and how much track time will you be seeing...

and whether your just replacing your rotors or the entire setup...know that cross-drilled and/or slotted rotors will decrease the life of your pads...

pretty much all of them will basically do the same...the components are relatively the same,..you factor in the R&D of each company and their reputation and that's where your price diffs are....Endless for one staggers their pistons in their calipers for even pad contact with the rotor..one reason they cost a bit high..Project Mu...well ghee they're one of the most well repected brake kit manufacturers in the Japan Tuner market...