Originally posted by JohnnyBravo:
All the slots are for are for additional cooling (more air flow & surface area) and will only benefit you in an instance where you're using your brakes a lot.....



Actually, slots are not for cooling, airflow or surface area. Slotted discs are used to clean the pad or "wiping the fire-band" as its called in the industry. The slots sole purpose is to clean the top layer of the pad, and prevent glazing of the friction material surface. By maintaining a clean even surface, friction level or mu can be kept more consistent from stop to stop.

Originally posted by airman1:

Slots are there to help remove the fumes and brake pad vapor occuring after hard braking, thus helping in cooling of the pads not rotors/discs/...



No they are not. Please see above. Fumes are no longer an issue with modern brakes (last 20yrs), as pad out-gassing doesn't occur due to new manufacturing techniques and materials.


Originally posted by airman1:
Will slotted rotors crack easier than non-slotted ones? Maybe...


Yes. Always.

Originally posted by airman1:
Drilled rotors, regarding cracking, are acctually safer that non drilled because crack would stop at the hole and would not spread, while non-drilled rotors if they crack, it's over.



This just isn't correct. There are too many factors at play. I can show you drilled rotors that show crack propagation twice as big as solid rotors. It has to do with rotor design, cheek thickness, venting design, etc. There are too many factors at play to simply say "X rotor is better because its drilled"


Originally posted by airman1:
Rotors are drilled for weight savings and looks alone, there is no heat benefits in drilloing of the rotors.



Wrong. Appearance plays a major factor in rotor cross-drilling, that much is true. However, for automotive use (not motorcycle) weight is never a factor. The weight savings from a drilled rotor is insignificant. Its done for appearance and slight performance gains. If the rotor is thermally sized properly (i.e., it has enough thermal mass), x-drilled holes allow for slightly quicker cooling (at a loss of thermal mass). However, they will crack quicker than an identical solid faced disc. The performance gains are slight, and not one that will be noticed by even the most discriminating street driver.


Originally posted by airman1:
There is one concern with drilled rotors. Moisture, and water dropplets can accumulate in those holes and eventually end up under pads, thus creating a problem.



Actually, testing performed by both Brembo and Porsche has shown that x-driled rotors offer improved perfomrance in wet effectiveness. In simple terms, it gives moisrture and water vapor a place to go, instead of forming a boundary layer under the pad.


Not trying to be a jerk, just trying to "correct the tech".

Very few of life's problems can not be solved with the reasonable application of more horsepower!