MaybeSomeday

I am in the market for a 991.1 GT3 and one I am looking at has roughly 40,000 miles and PCCBs. I was told that the brakes haven't had any work done and they are at 50% wear. I have done some preliminary research and it seems that the only things you really should need to replace are the brake pads which may be a few hundred dollars each and the rotors, which are the big ticket items, should really never need to be replaced. Is this really accurate or would I be walking into a huge risk with a car like this?

blraider97

Not necessarily true. It all depends on how the car was used, which you will never really know, Need to get a Pre purchase inspection by a reputable shop. As part of the PPI there is process that involves testing the rotors to see how much life is left in them. Do a search on the forum and you’ll find tons of information on this. Do not purchase any GT3 without a thorough PPI and never believe the sales person’s story. Oh, and also do some research on the engine issues with the model E and G engines to determine if the one in that car has been replaced or not. If not, there is still some time left on the 10-year engine warranty but I would want to know the full history before diving in. There is absolutely little reason to not purchase a 991.1 but it needs to be vetted just like any high-end car purchase. Best of luck!

itrsteve

If the PCCB’s scare you then you can always take them out and run steel discs

https://www.essexparts.com/brake-dis...on-brake-discs

Bxstr

It's likely the PCCB pads are at 50%. Not rotors. Pads at 50% on a PCCB car is the ideal time to change them. A set of pads is around $500 for the front and $500 for the rear.

Take the car to the dealer and have them measure the rotors with the carboteq tool. This will confirm rotors are good.

Rotors on a PCCB car could need to be replaced if it saw extensive track use. You also want to inspect the outside of the rotor for chips as this can warrant replacement.

BLKMamba

Yep - definitely get it PPI at the Porsch dealer and get the carbon rotors measured. If the dealer didn't show me the carbon rotor measurements on each corner, i would've walked away on the deal before i bought mine. I recently did a DIY pad replacement on mine at 50% thickness. Pads were trashed with hairline cracks after multiple track days but the carbon rotors were still in great condition.

tstafford

OP: You really should get the density readings from a Porsche dealer. The test is done using their special tool and is only really valid if the test is performed with the rotors off the car.

TRZ06

100% THIS !!!!!!!

ipse dixit

You need a Carboteq tool to measure the density of the PCCB rotors.

That's the only way to tell how much life is left in those rotors.

Contact your local Porsche dealers, as the tool (from what I understand) is generally most easy available at Porsche dealer.

Oh, and have them do the measurement with the brakes off of the car to get a proper measurement.

Larry Cable

sound advice - I'd be surprised if the rotors were at 50%

catdog2

What seller is going to let the potential buyer take off the 4 rotors for an inspection, give me a break...

dsteding

I’ll be a counterpoint here. It is best to get the carbon measured for peace of mind. But if the car is still on its first set of pads at 40k miles, those rotors are fine, the 991 PCCBs are pretty robust. I just put a set on my 991.1 GT3 that had 40k ish miles and a half dozen track days and the carbon was 90% plus in back, 85% plus front.

the rotors coming off my car have 23k miles and 60 track days, 3 sets of pads used. We’ll measure those to see how worn down they are.

MaybeSomeday

We were sent the following readings. I assume the tires need replacing, but not clear about the brakes since we weren't provided a % of wearRear tires 7/32

Front tire 5/32

Front brakes 10mm

Rear brakes 10mm

Bxstr

10 or 12mm is new pad thickness. So pads don’t need to be replaced.

tstafford

This doesn't include the data one needs to assess the health of the rotors. What is needed is density readings from various locations on each disk.

Example in this thread: https://rennlist.com/forums/gt4-spyd...surements.html

parkerfe

I would stay away from PCCBs.
They are the biggest rip-off for a production car in automotive history.
They cost too much on a new car and way too much to replace.
The slight braking performance you may get is not worth the cost to replace by a rock chipping the rotor.