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Old 04-26-2004, 07:43 PM   #1
Virginia72SWB4X4
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Join Date: Jan 2004
Location: Fredericksburg, Virginia
Posts: 144
I believe they're there do dissipate and allow the release of gases created from heating of the pad material. If you look at high performance braking systems they have the groves machined across the rotor at an angle. This is to assist the relaese of gas by the rotating assembly.
They also naturally assist in the dissipation of heat because of the addtional surface area.
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