Editing Brakes (section)
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==Rotors== Slotted and cross drilled rotors help cool the brake system with airflow across them and the calipers. Without sufficient airflow, having slotted or cross drilled brake rotors is hardly more effective than standard ventilated discs. The slotted/drilled rotors do help with brake pad out-gassing; when the pads reach their operating temps or higher they start to give off gas as they wear and the slots and/or holes gives this gas a place to go so it doesn't build up between the pad and rotor, causing a loss of brake effectiveness. {| |[[Image:Disc_vented.jpg|thumb|center|700px|Typical vented rotor]] |[[Image:Slotted_vented.gif|thumb|center|500px|Slotted and vented rotor]] |[[Image:Slotted_x_drilled.jpg|thumb|center|300px|Slotted and drilled rotors]] |} The downside to cross drilled rotors is reduce surface area, a decreased co-efficient of friction and they might be more prone to warping or cracking if not done correctly. The advent of carbon metallic friction materials with their increased temperature stability and friction coefficient characteristics can mean slotted/drilled rotors are needed less than before. Typically, in original equipment passenger car applications these holes are cast then finish machined to provide the best possible conditions to resist cracking in use. But they still may crack eventually under severe circumstances. With a properly designed brake system, drilled ventilated discs can operate cooler than non-drilled non-ventilated discs, due the higher airflow rates through the vents from the supplemental inlets and increased surface area of the holes. The airflow is into the hole and out through the vent to the OD of the disc. If discs are to be drilled, the external edges of the holes must be chamfered or radiused.
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