Quote:
Originally Posted by samr350
But personally if the scratches aren't too deep I would just slap new pads on and bed them in hard. And if the scratches are really deep then you're probably past min thickness anyways. Rear rotors are pretty cheap too.
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+1
I ran out of rear pad on one side near the end of my last session at an event last year and new pads almost completely evened out the rotor surface appearance during my next track day although I kept a close eye on it after each session and did some hard stops on an empty road beforehand to make sure it felt ok and didn't crack. I believe I found a maximum allowable scoring spec listed at 1mm for the rotors which was definitely deeper than the grooves caused by the backing plates in my case.
I'm surprised that I couldn't hear the grinding noise while on track driving with the windows down lol!
I think my case was caused by using a different brake pad manufacturer & compound front and rear...not recommended. I managed to use more rear pad thickness than front pad thickness that day when I usually see about 2x more front pad wear than rear pad wear.