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Don't drill your own rotors. If you want them drilled, just buy them that way.
There are only two advantages to drilled rotors and not all of them have both. One is the vent the hot gas and the other is weight. All that rotating mass takes energy to stop and start. Mass is a double edge sword because less mass equals higher rotor temperatures all else being equal. I don't beleive you will find any help with the water issue here. Try light pressure on the peddle when driving through puddles or perhaps residual pressure valves would provide some releif so long as the pad stays in contact with the rotors. Although I am not sure the latter will have any affect. If you want the gas benefits of drilled rotors you can achieve the same results by slotting the pads or rotors.
Rick
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