hoops25

So, after 4200 miles and 6 track days on my 2014 GT3, service told me that the rotors were cracking to the point where they should be replaced soon. I wanted a second opinion, so I took them to a recommended Porsche service shop and the owner agreed. I want to start tracking my car 8-10 times per year, so the consensus from rennlist threads and service guys is that I should have purchased a car with steel brakes, but more importantly I should switch to steel now, since I want to keep tracking the car.

Please excuse my ignorance, but do I need to downsize the rotor size and swap out the calipers as well? It seems that there should be an aftermarket solution. Can anyone share costs to make the change from PCCB to Steel? Any advice would be appreciated.

Thanks,
Chris

Jpacione

I believe Racing Brake makes replacements. Here is a thread to catch you up on the topic:

https://rennlist.com/forums/991-gt3-...ck-thread.html

KA MOTORSPORT

The only good upgraded disc options are Brembo Racing (what we sell) and AP racing for track use. Both are 380 mm front and rear, being replacement options for a GT3 with iron equipped cars. There are a few other PCCB size direct replacements available from other companies if you want to look into that as well but the good brake brands like Brembo or AP don't make those disc sizes.

991 GT3 OEM Iron red calipers from Porsche - $5000
Brembo Racing 380 mm discs F & R: $3790 MSRP.
RE10 endurance pads: $1200 MSRP. Other pads are cheaper but don't last as long.
You can do the Tarett studs as well since you need to remove the calipers to swap pads.

On the 991 GT3, you can't buy any of standard service parts like pistons or inserts from Porsche like it was for the 997 (For 991, Porsche only sells complete calipers if any parts are worn), so we believe it helps to have a second set of calipers for track use anyway.

We and a few other shops have done this exact conversion as well. We can help you source the parts needed so feel free to PM us for specifics.

SmokinGTS

Girodisc will have direct replacement PCCB rotors to steel shortly. You will be able to use your calipers.

shaytun

Based on another comprehensive thread on here it looks like OP is getting much less mileage out of his PCCBs. OP, can you share your track experience? Mileage? Habits? Etc? May want to add your input to the other thread. I'll have to find the link.

shaytun

https://rennlist.com/forums/991-gt3-...ck-thread.html

orthojoe

6 track days and pccb are done? Lord have mercy!

Fwiw, I've got 26 days now on AP rotors and expect to get another 5-10 days out of them. And I'm not slow. Lol

hughp3

pccb's always looked cracked. The proper check is with a special $7K gauge that detects carbon density. Did your Porsche dealer check with this tool?

Sarum87

i have 4,300 miles on my GT3 and have dome 5 track days with PCCB. My brakes are fine- just had 'em checked. I'm up in the air if I want to replace with aftermarket carbon option or go steel when the time comes.

shaytun

These are carbon ceramics?

GrantG

No, cast iron

hoops25

I appreciate everyone's responses. Based on everything I have heard, I am going to get third and fourth opinions. I have appt's with the senior service tech at my local dealer and a motorsports shop. Everyone seems to think that there is no way the rotors need to be replaced.

If they do, the conversion to Girodisc steel rotors will allow me to keep the calipers with different pads, and looks like a good option. They were very helpful.

I'm on vacation next week so I will report back soon.

Thanks!

bronson7

^^^This

hoops25

They have not yet, but when I am there, i'll insist. Will they need to remove the wheel?

hughp3

OP this is the tool http://www.carboteq.com/