You can check the rotor thickness with a micrometer. For S model the min thickness is 26mm. Or just check the edge- is there a noticeable lip? I generally get 2 sets of pads to a set of rotors and that is for track use. The rotors are tossed due to cracking not thickness. On a 987 pads are super easy to replace- unless you have problems with the dampers (see the recent thread on this). Rotors are not hard to replace just a little more involved. Hardest part for me is always re-installing the brake line bracket. If the sensors have not tripped and if you are careful removing them they can often be re-used. In my experience indies and dealers will always replace them and charge a marked up cost for them.
Cracking is not common with street use, the temps don't get nearly as high. Sorry if my point wasn't clear- I wear out 2 sets of pads and the rotor thickness is still within spec (> 26mm thickness). The first simple check is just look through the wheel spokes and feel the rotor edge- is there a noticeable lip there? Also is there pronounced grooving of the rotors? If there is a sizeable lip or they are badly grooved, it may be worthwhile to replace. If you can, post a pic and we may be able to judge better.
added photo of a worn out rotor. "Lip" is > 1mm, so total thickness is <26mm. Hope that helps
Indeed looks like you have a lip on the edge. The original thickness is 28mm, so if you have just a 1mm lip on the outside you likely have the same on the inside and that would put you at the min spec.
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