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A quick way to check is to see if there is a rotor lip at the top. A 1mm lip on the side you can see probably means 1mm on the back side, that is 2mm of wear which is the wear limit for the 986 rotors.
The first time I checked mine way back they were waaaay past that, I think almost 4mm of wear. They still looked good and I had even done my first track day with them (and I was pretty aggravated at the shop that I paid to do the pre-track inspection for not catching that)
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