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Firstly, this is for the future. Do you sit at traffic lights with your foot on the brake? If so then this can easily lead to a localised hotspot that will lead to warped discs over time. As for machining or replacing is entirely dependant on the cost of the discs (being as they're grooved) and the quality of them.
Parts are much cheaper in USA but in saying that who knows what quality those parts are and how long they'd last. Price up the best discs n pads you can afford and then price up what the grooved ones are worth and the cost of machining. If the grooved aren't a quality brand then just fit quality new stuff.
 
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