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Originally Posted by Dean
I think it is cheaper than water cooling though unless you are just spraying water on the rotors which would be against the rules in most any series I can think of...
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Running a variable pressure, flowing, closed loop brake fluid system is cheaper than just flowing water through the calipers and a heat exchanger?
I can't even imagine what a master cylinder or calipers pistons that allow fluid to flow through them would look like! A secondary system that flows water would be far easier to engineer... just add some water channels to the calipers, some hoses, an electric pump, and a radiator. And if the water cooling system fails, there's no mechanical/hydraulic connection to the actual braking system.
WRC tarmac cars use brakes with 6-pot water cooled AP calipers.
Those crazy European Super Truck beasts use a simpler spray system, note the steam:
