Much of the information discussed here can be found in the DIY Brake Job Thread
DIY Brake Job
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Before turning them, I'd check the price of new rotors vs. the cost of the machining. Personally, I do nothing until below spec or they become deeply grooved - then I replace.
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I considered machining my front rotors to clean the surfaces (had a very mild vibration during braking) and especially to remove the excess material on the edges. That was until I damaged one trying to get it unstuck from the hub.
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I replaced my front rotors with aftermarket type,cheaper but with a lot of issues
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Since one of my rotors was already toast, I bought some cheaper aftermarket ones as well; Napa premium rotors, ~$45 each at the store. I actually would have gone with their higher end model (ultra-premium, ~$80 each), but the store didn't have them in stock and I was short on time. Both types I believe are made in China. With 5k+ on the Napa rotors and OEM replacement pads, I've had no issues with them.
By the way, the Napa rotors are made by raybestos; I believe the Napa premiums are the same as the raybestos professional grade line and the Napa ultra-premiums are the same as the raybestos advanced technology line. They can be found pretty cheap at amazon.com or rockauto.com, who conicidentally acted as a fulfillment source for amazon on one of my orders. (Don't you just love how branding works nowadays?) Sorry for the thread drift.