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Originally Posted by blaznhot_23
the combination of both cross drilled/slotted rotors from a high quality brake manufacturer can help decrease braking distance by providing decreased brake fade along w/ better pedal firm to an extent....
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I knew the outgassing about cross drilled, I had a brain fart about the surface area--the increased surface area does not dissipate heat better, as metal is a better sink than air. I flipped it around.
I disagree about a combo of cross-drilled/slotted rotors being the best. Quite frankly, cross-drilled are completely obsolete as you said, and are only there for aesthetics. If you wanted to get rid of the boundary layer glaze, you could simply get slotted rotors. Sure the manufacturing process improved, but holes still disrupt the structure of the rotor, and cause inconsistent wear on the pads. They're not worth it. Slotted w/o cross drilled seems the best for hard braking. There's good reason why cars on Lemans, JGTC and WRC don't have cross drilled rotors.
Edit: hmm, it seems some kits are designed for front only, like the Stoptech BBK? I guess it doesn't need the rears then. But kits that come in 4s (front left/right and rear left/right) should be upgraded in 4s.