New brake rotor ?

gost · gost's Garage

I purchased new rear rotors for my 85 Carrera which are OEM made by Sebro in Germany and when I got them they had some machined slots on the outer edges of both rotors I have never seen these before on any rotors I've purchased before (many) and am wondering if this is normal or screwed up? Is this some sort of weight balancing technique by the manufacturer? What do you think?

911TE · 06-24-2005, 01:28 AM

Hi gost,

These slots are machined in for balancing the discs.
The older original discs used clamps inside the vented discs for balancing, and some after-market discs are not balanced at all.

So if yours are balanced it is a good sign, I use the same discs on my SC, no complaints!

Sebastian

Bill Verburg · Bill Verburg's Garage

I agree, the cuts are from balancing. Looks like they took a lot of material off

gost · gost's Garage

Thanks Sebastian and Bill. I was hoping that's what it was. I also thought it may have been a wear indicator, when the rotor wears to 22mm thk there's not much metal left along those machined edges and it's time to change them. 25 yrs of turning wrenches and I see/learn something new about simple rotors. Life is interesting!!

Thanks again.

Gordon