Stoptech Aerorotor Crack???

What do you guys think. This is a pic of my left rear rotor. Is that a stress crack I see? I have stoptech two piece aerorotors all the way around. I am hoping this is an e-brake pad impression but it sure looks suspect to me. Stoptech engineers are also reviewing this pic and promise to give their thoughts on Monday. The guy who looked at these pics and my rotor wear thinks I am also getting to much heat transfer from the EBC reds and should probably go to the EBC Yellows (EBC's track pad). I guess I am to aggressive for the reds on the street.

Well it is cracked .... made in China
If you knew how much junk comes in from China: Tools, Car parts, precising parts. All break at some point ...

Try the ones from Roe Racing. I have used them very successfully. They tend to resist very well abuse.


You can still call StopTech and request a replacement rotor.
I am sure they will replace it, with Fedex 24 hour express service.

Schulmann said:

Well it is cracked .... made in China
If you knew how much junk comes in from China: Tools, Car parts, precising parts. All break at some point ...

Try the ones from Roe Racing. I have used them very successfully. They tend to resist very well abuse.


You can still call StopTech and request a replacement rotor.
I am sure they will replace it, with Fedex 24 hour express service.

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I am still not convinced it is cracked. It cannot be the e-pad impression as that pad is about 1/8 to 1/2 shorter in width than the length of this line. It could however be the primary pad left a mark after washing last time. I am going to emry cloth it, and see if the line is still there. If it is then it is a crack, if not then its a primary pad impression after washing. As far as china made, not a clue here. But I don't care if they are. I don't think Dodge would be putting these rotors on the 2008 ACR if the engineers at SRT thought they were substandard quality. Jury is still out if it is cracked or not. I'll let folks know if it did, or not......

Dont care what it is, for peace of mind alone I would change the rotor.

Doesnt look cracked to me. I use them on my racecar and that looks like pad residue. Probably after a hard (heat soaked) run and left the brake clamped down too long after stopping.

Schulmann said:

Well it is cracked .... made in China
If you knew how much junk comes in from China: Tools, Car parts, precising parts. All break at some point ..........You can still call StopTech and request a replacement rotor.
I am sure they will replace it, with Fedex 24 hour express service......

Click to expand...

Shame on you. YOU ARE WRONG. MAYBE AN HONEST MISTAKE? Facts please:

Some of the worlds BEST steel comes from the UK and from Italy. Stop-Tech Aero Rotors are made in ITALY and are all edge-stamped with country of origin.

Some Other Brands (SOB) sold under 'private names' instead of the true manufacturer/importer would absolutely surprise you (especially) and ARE China and Mexico made. The low price should be your first clue.

StopTech is examining the data and if you bought em from PartsRack we will be involved, too. {Your Profile is anonymous} If it IS determined to be a metal defect, you WILL LIKLEY get a replacement, as well as its opposite mate at cost....despite the false allegation and sarcasm posted in red.

PS GOOD ON YOU Fast Too , (whoever you are!) for watching your rotors so closely. Even Formula One is having some serious rotor issues at this very moment....even the best metal CAN break! Generally speaking, if any crack does not radiate to the hub, or the outer edge-lip, its not likley to be a catastrophic flaw...... but GOOD FOR NOTICING this blemish, which might not be a crack, but a footprint of the VANE beneath.

I have seen a rotor crack like that when the car was washed when the rotors were hot . A buddy of mine use to hose off his wheels as soon as he got home and cracked a rotor , and it looked close to that. I hope its not ...

Call up Norm (TXWYD), he can tell you what a cracked rotor looks like---he's probably got a pallet full after that magazine test.

Go to a machine shop and ask them about a die that would show you if it's cracked. Good machinists or tool & die makers are the Gods of teh metal world. Ask an expert - I wouldn't even hazard a guess.

Ted

JonB - PartsRack said:

. PS GOOD ON YOU Fast Too , (whoever you are!) for watching your rotors so closely. Even Formula One is having some serious rotor issues at this very moment....even the best metal CAN break! Generally speaking, if any crack does not radiate to the hub, or the outer edge-lip, its not likley to be a catastrophic flaw...... but GOOD FOR NOTICING this blemish, which might not be a crack, but a footprint of the VANE beneath.

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Jon,

Thanks. Yes I did buy these through you. The note on the vane foot print is a good thought, but the vanes point in the opposite direction than the crack does. Anyway rain here today and I plan to pull my wheels to clean the inside barrels and wheel wells. While doing so I will emry cloth that line as stoptech suggested. If it doesn't come off I'll be back on the phone with them Monday. Thus far they have been very helpful. I'll let you know how it turns out.

JonB - PartsRack said:

Shame on you. YOU ARE WRONG. MAYBE AN HONEST MISTAKE? Facts please:

Some of the worlds BEST steel comes from the UK and from Italy. Stop-Tech Aero Rotors are made in ITALY and are all edge-stamped with country of origin.

Click to expand...

I do wish it was an ownest mistake. Unfortunately it wasn't.
Okay maybe I was a little sarcastic. But I had a good reason ...

I have 4 wrapped Brembo rotors in my garage ... They weren't at all abused. Just a little rain and heat. I don't know what they do but since a 2-3 years their quality is going down. I just bought a 20 years old 100% US made AMCO machine to fix my rotors !!! The AMCO is under the patio chairs on the left and my Viper is on the right. I am tired with all these fake steel products .... from tooling to dive cylinders going through car parts.




China is the No1 steel producer. Italy counts only for maybe 0.5% of the world's production. The Italian capacity is just not enough for what they make. It is a major issue in all industry how to identify the country of origin of the parts/products made and we have the cross branding issue. In addition Italia is the only european country importing steel on large scale from China !!! Other countries buy the steel in Russia or Brazil .... I don't know how the maths work in Italie but when you produce 1T of steel and you make for 10T of steel products and you state that all of your 10T steel is Italian made ... there is a problem.


I can't tell you exactly about where StopTech buys the steel (but they don't make it). They have good products. However one of their provider could have sliped a bad batch of steel into their production line. My point was about the china made steel sold uner US or whatever made steel. And I will stick to it.


Maybe the guy has an issue with his pad print. However pad prints usually look a little different. The best thing is to call whoever sold that rotor ... I am sure they have experience with this type of problem.


Yes even the best products can brake. This is why customer service counts.
Jon, you give a first class customer service.
I and all of the VCA guys are 100% satisfied what you do.
I would like to applogize if my thread offended you. It wasn't intended to do so.

Setting the who produces the best steel debate aside here is the rotor after lightly emery clothing with a fine grit. I would say it was pad print.

Oh ya and you can see why I am cleaning my barrels today

FAST TOO - A dye penetrant test is really the only way you can know for sure if there is not crack. A simple method is to use a red ink (ink pad ink or permanent Magic Marker ink) amply spread over the target area. Ink has a low viscosity and surface tension and will wick into a crack, and would be immediately visible.

JB/SRT said:

ink pad ink or permanent Magic Marker ink

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Thanks for the tip, I'm sure your right. Something about the word permanent bothers me though. I'll just keep an eye on it for now and see if that line reappears where I lightly sanded it off. If it does its going back to stoptech to let them do the metalurgy analysis.

LOL...it aint cracked.

JonB - PartsRack said:

Shame on you. YOU ARE WRONG. MAYBE AN HONEST MISTAKE? Facts please:

Some of the worlds BEST steel comes from the UK and from Italy. Stop-Tech Aero Rotors are made in ITALY and are all edge-stamped with country of origin.

Some Other Brands (SOB) sold under 'private names' instead of the true manufacturer/importer would absolutely surprise you (especially) and ARE China and Mexico made. The low price should be your first clue.

StopTech is examining the data and if you bought em from PartsRack we will be involved, too. {Your Profile is anonymous} If it IS determined to be a metal defect, you WILL LIKLEY get a replacement, as well as its opposite mate at cost....despite the false allegation and sarcasm posted in red.

PS GOOD ON YOU Fast Too , (whoever you are!) for watching your rotors so closely. Even Formula One is having some serious rotor issues at this very moment....even the best metal CAN break! Generally speaking, if any crack does not radiate to the hub, or the outer edge-lip, its not likley to be a catastrophic flaw...... but GOOD FOR NOTICING this blemish, which might not be a crack, but a footprint of the VANE beneath.

Click to expand...

Actually Jon, Stoptech does not make any of its rotor rings, as they have no ownership in any foundry. Check batch to batch and model to model, they come from all over. I am not saying there is anything worng with them, they have a great product.

jpas said:

Actually Jon, Stoptech does not make any of its rotor rings, as they have no ownership in any foundry. Check batch to batch and model to model, they come from all over. I am not saying there is anything worng with them, they have a great product.

Click to expand...

Where did that come from?

If you slowly re-read my post (as you quoted) you will see I simply stated that the Stop Tech Aero Rotors are made in ITALY and labeled as such. I did NOT say, or imply, that StopTech owns the foundry there, or any foundry anywhere.