how thin can you go before replacing?
The thickness that, just before applying the brakes shatters the rotor, killing you in the face, setting you on fire, and making you crash in to poo.
If you are worried about it buy some new ones.
Hmm, I'm not keen on fire, but not fussed by poo. I'll leave it a bit.
Replace it anyway.
Easy to forget that your rotor is getting thiner if the brake feel fine.
@Brookly_Bay started
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The thickness that, just before applying the brakes shatters the rotor, killing you in the face, setting you on fire, and making you crash in to poo.
If you are worried about it buy some new ones.