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It's not so much that they don't take kindly to being turned as much as 1) If they have hard spots those will not be machined out and the problem returns in a short time, or 2) if the rotors are machined off the truck they end up with excessive runout and develop thickness variation in short order as well.
Rotors need to be turned on the hubs with a Pro-Cut lathe, and even with that, closely monitored if there are hard spots. If they have hard spots, then they need to be replaced. It will not matter what friction material is on the vehicle.
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Jack
Former Vehicle Test Manager - Friction Products
03 F350SC 4x4 6.0 Auto 5/30/03
Truck Modifications below in Pictorials on Facebook. Search in Google - Facebook TooManyToys
Step Lights;Painted Flanges; Bypass Oil Filter; Heated Mirror Switch; Reverse Lights; 7.3L Fuel Reg Shim; 6 Disc Radio Speed Volume Mod; Coolant Filter, etc.
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