russo

The damage to the rotor following last weekend's stud failure. What to you guys think? So far I have been advised to replace the rotor.

roberga

done---- it could just completely blow up with out warning which could not only put your life at risk but anyone near you. Run it past you insurance co. Could happen anywhere.

Macster

My initial response was going to be you should replace the disc.

However, I skimmed through a collection of articles (3 parter) from Total 911 in which PCCB covered in great detail that has in a section of what to look for when buying a car equipped with PCCB brakes. I quote directly from the article, in side bar titled "Points to look for when examining PCCB, perhaps on a potential purchase, pay attention to the following:"

Check around the edge of each disck for damage -- officially two x 10mm (and a maximum of 3 damaged areas per disc) is acceptable although you may think otherwise.

So if the damage fits within the above and there are no other signs the disc is unusable (worn or suffering from too many or too large in size "rough" patches it would appear "officially" the disc is ok.

Sincerely,

Macster.

mikymu

Replace it. I will be selling my complete set of Gen II PCCB shortly

RJFabCab

I would question the integrity of that rotor. We're not talking about 'surface' damage from use. The ceramic rotor was whacked at high speed by a wheel and it chunked. I'd also be concerned about the shear stress on the hat hardware.

Personally, I'd replace it, but for that cost you could just use this as your excuse to swap to a high quality slotted setup.

Your pads sure do look thin back there...

tcsracing1

this is why i was told not to run PCCB rotors when tarmac rallying or on tracks that have common offs.

i love em', but cant afford em....

the damaged rotor looks to be junk......

this would break my heart.

MJSpeed

Not claiming to be a ceramics expert and knowing how expensive they are, still I would replace it.

ADias

I do not see what the problem is. Is that little chunk at the edge? The material is amorphous and I doubt that it would crack from that point.

Edgy01

Go to your Porsche dealer and have their service guy evaluate it. The worst they can say is to replace it. But what's with all the corrosion inside the bearing area? Wow! That salt water in Brownsville must be nasty!

BBTurbo

Obviously safety is your number one concern, so the decision is ultimately up to you, but I think the rotor will work without any issues. It's not glass. The chunk will not propagate. As long as you don't see cracks, I think you are fine. I'd run it. Just make sure it doesn't chew up the pad.

Macster

Not sure how applicable it is but years ago I used to test silicon carbide or aluminum oxide grinding wheels (some 3ft in diameter used on crank grinders and such) for cracks by suspending wheel with something through its hub hole and tapping on side of wheel with wooden handle of hammer.

Wheels should ring. If they don't they're cracked and should not be used.

Could be this rotor could be tested similiarly but you'd have to remove rotor assembly from the hub so the thing could ring without the pads dampening the sound.

Tap easy. Sneak up the right tap force.

Sincerely,

Macster.

NJ-GT

as I posted here that rotor is toast. It is a worn out PCCB rotor, notice the wear marks.

In the original thread picture, the wear mark was visible. In these new pictures you can see two wear marks, plus stress cracks. The rear rotors (both) are due for replacement.