charlesk777

Hi everyone,

I searched the forum and read as much as I could, but as I’ve only ever had cars with steel brakes I was hoping you guys could help me with your opinion.

Thank you in advance!

WP0

Wear can only reliably be determined by the laser measurer available at dealers.
Otherwise, you can look for cracks between drill holes, chips (I think I see one in the last photo), irregularities on the surface, and feel for roughness (they should be smooth to touch).
Superficially, they look OK to pass a CPO, but I would get the rotor thickness measured by the laser device at a dealer.

CubsFan1

You might consider getting a pre-purchase inspection done. Definitely worth the time and expense on a car of this magnitude. You likely know, pad wear is less of a concern than flaws in the rotors.

Are you planning to purchase as is, or is the seller replacing the pads prior? That is typically the range where pads get replaced.

orthojoe

1300 track miles is only 13 track days at most. The car probably had many more than that, or it was driven on some very brake heavy tracks. Those rotors look like they are delaminating and need to be replaced. It's no secret I'm not a fan of pccb, but they should last longer than 13 days.

The last pic is the worst looking one to me, but maybe it's not clear. Is that a rear or front rotor? If rear, the prior owner was overdriving the car and the psm system overheated the rear rotors

Edit: that is a front rotor. Car had more than 13 track days.

Z06

they look beat up.. unless you're prepared to get steel replacement rotors or the sale
price reflects the PCCB's are done, pass on it.

Petevb

The advice is not to let pccb pads get down to 2mm, especially on a tracked car, as that puts more heat into the brakes and can lead to earlier failure. It looks likely that advice was not followed, which in turn could mean that “1300” track miles might result in disproportionate ware.

The dealer will charge ~25k to replace PCCBs. If you look you might find used rotors for roughly half that in decent condition.

A dealer inspection of the carbon carbon content with the rotors off is the correct way to determine condition and percent of life remaining.

Bxstr

Yeah those look like they are due for replacement.

gp1

That is my car in question. I did a horrible job by cleaning not the rotors before taking those pictures. The dealership recently performed the PCCB measurement it is definitely not due for replacement. Here are some better pictures after some using some wheel cleaner on it.

orthojoe

And that is why you need clear pictures. Second set looks just fine

gp1

Definitely... It’s the biggest concern for buyers it was a major oversight on my part to not present them in the best light.

usctrojanGT3

Just get a car with steel brakes and save yourself both money and worry.

Psup4s

+1 I never understood how used cars with pccb attract buyers more than iron brakes when its so much more expensive to replace.

Porsch

agree

nah. no ceramics, no care.

CAlexio

Because they feel better, allow wheels to stay clean, and they are a significant unsparing weight saving item. They definitely have value over steel if in good condition.

ToasterThief

My guess it's because most who spec them don't hold on to cars long enough/drive them hard enough that they worry about replacement.

I see it kind of like a game of "hot potato" for adults.