sothpaw2

My rotors are finally showing how I like to track the car

How long do these go? I would think it's time for new rotors when the cracks near the outer perimeter. Does anyone have a picture?

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UstaB-GS549

Like these?

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Cracked from hat to outside diameter. It always seems to happen with the car parked. If you feel any vibration under braking when going out for the first lap, it's time to get off and give a good look. Small cracks in rears are sometimes hard to spot.

sothpaw2

So you can let them go until they nearly reach the OD? Some of those look really close.

gkmccready

Here's one a friend sent me of his buddys C6Z rotor:


And here's a set pictures of one of mine:


http://www.petting-zoo.net/corvette/Rotor-2007-02-26/

At $25-$35/corner I swap 'em out much earlier now. You'll also notice that like the dummy I is, I had the rotor on backwards that time... which brings up another point for those guys that say GM using one-sided rotors is "okay" -- you're wrong. If I put the front rotors on the wrong sides, I eat them up, put them on the right sides and they work pretty darn well for quite a while. Please, don't ask.

UstaB-GS549

It's hard to predict how long it takes to go from heat checks in the surface to a full blown fracture. I have had rotors fracture in one day. On the other hand I still have two of my original OEM rotors. I keep using them as my "limp home rotors". Ugly, but they still have not cracked thru. The first OEM rotor to break lasted two track days.

sothpaw2

Wow--can't believe your drove on that!

gkmccready

I dunno about the first one I posted (C6Z), but mine happened in the last session of the day and I didn't have spares with me. Early in my Corvette-life... I nursed it home 160mi trying not to hit the brakes...

Bill Dearborn

A couple of weeks ago I cracked the right front in 3 places and the left front in 1 place. There was a little thumping at the end of the previous session but when headed down pit lane I always do a brake check at speed and I could really feel and hear them. After replacing those two rotors I went out for another session during which the left rear rotor cracked. Three in one day but they all had at least 4 track days on them.

Bill

AU N EGL

If you can put your finger nail into the crack, change the rotor.

986_C6

Are there any marks on the rotors that tell you whether they are RF or LF? Sorry for slightly highjacking the thread OP.

gkmccready

The vanes should sweep towards the back... it's trying to let air escape when the rotor spins, not trying to grab it and pull it in.

986_C6

Thanks for the info!