C02 used for a cooling agent?
Water cooling had been used for a long time in some race (road race) applications. again VERY effective at cooling but this is ultimate high end stuff (look at super touring cars of the mid to lates 90's for examples).

Dont forget alot of the heat is absorbed into the hub. This can put added stress on the wheel bearings also.
Chris.
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Race bikes and race cars use water injection to cool their brakes with ambient temp water. Cold water can cause damage and Murphy's Law tells us damage will happen coming out of a long straight into a sharp turn lol.
If you really, really want to spray your brakes though, use distilled water through a window washer pump, then whatever cheap line, to a mister nozzle a couple inches away from your rotor. You want the nozzle that sprays a mist, not a jet. The mist will vaporize immediately on contact and that is what you want. You WANT the water to absorb heat from the rotors/pads and immediately vaporize but not collect and condense back into liquid.







