gweedo911

Thanks, I'll go through one more set of OEM pads then I'm changing to P-50. Hopefully the rotors will last. How many miles do you have on your 7 now?

roberga

I got the car in March with 2500 miles I am at 8,000 today. I will bein Alaska fishing for the next 10 days so it will reduced my miles per day. The brakes on the 997 are way better than the 996 and the ABS seems to activate later.

roberga

A freind the built 935's for HH said they look like recycled 935 ducts.

willr

Well I just discovered that my front right PCCB has delaminated, after only 18 months and around 20 trackdays. All the discs were feeling slightly worn on the outside, but the inside face of the front right disc has gone completely.

I knew getting PCCB would be an experiment, but now I'll be switching to steels.

By the way, anyone have any comments about Performance Friction rotors? They are cheaper than Brembo here in UK.

GlennMc

Mine look all OK apart from the 3 delaminated circles around the circumfrence of the disc.

Can't get a straight decision out of my dealer as to what these circles mean

willr

I believe those circles are wear indicators, which start off worn. If you compare the feel on the circle with the feel of the rest of the disc surface, you get some impression how worn the disc is.

The outside of my discs all felt OK - not as smooth as new, not as rough as the 3 circles. It was a different story on the inside...

997gt3north

Not exactly sure what you mean by "delaminated" - can you please explain?

Either the rotors are "solid" not delaminated or by delaminated you somehow mean the ceramic material has completed separated from the carbon material (can't possibly imagine this is true)

The rotors are fine with small cracks in the ceramic material and they are also fine with the "circles" showing

I think they are not fine when you have "significant" cracks / "space" between the ceramic material as this is what disapates the heat / technically stops the car (yes I know tires stop the car)

The reason I use the word significant is that at that point the heat is not being disapated by the ceramic coating but it will then penetrate the rotor and it could crack under the heat


So, for all of us here, who told you the rotors had delaminated?

Can you give us a picture?

Maybe we can save you some money - maybe?

I have done far more than 18 trackdays - think I'm on my 8th set of pads - 5 OE and 3 green

Front rotors look ok (yes some use for sure)
Rear rotors look more used - but still more in them for sure

GlennMc

Here's pic of my rear disc.

My dealer says that from their technical bulletin, that when there is a space of 1cm squared of delamination within these circles, then the disc needs changing.

The rest of the disc surface looks fine though....would appraciate anyones thoughts on this...

997gt3north

- In my opinion (yes only mine) those rotors are perfectly fine
- there was a picture a while back of someone who attended a Porsche school somewhere in the states where you drive different pcars for three days and they had a lot of famous teachers - they showed a set of ceramics that had been taken off to be replaced

- yours look brand new by comparison

- my own rear disks look far more worn in comparison and I think they have another 20 days in them

- i do not look at the "circle" but look at the surface of the rotor and how many micro cracks in the ceramic material i can see (not like a crack in an iron disk that is an actual crack in the metal) but a crack in the very thin ceramic surface that is mated on top of the carbon structure underneath

- in my opinion, those rotors are fine for another 20 days easily likely many more than that)

- just my opinion

GlennMc

Thanks for that, yes, i am of the same opinion, and will run them untill the surface starts to show a lot more wear.

Hopefully these new brake ducts will help their life span too.


G.

willr

Glenn, those discs look fine - but I would recommend checking the inside face, as that is likely to get hotter and wear faster.

My discs look more worn than yours on the outside, but the inside of one now has just a few patches of the thin ceramic skin left and the rest feels like very rough sandpaper. That's what I mean by delaminated.

GlennMc

Good call, i will check the inside of the disc asap.


G.

stevecolletti

I couldn't agree more, though that's what I ended up with - well, minus the telephone module and leather seat belt buckles. But if you weren't on the right list when orders were made, you have to find one that you can live with.

Carrera GT

Threadjackers! Sheesh!

Anyway, if you're retrofitting the ducts, note that the undertray of the 997.2 GT3 has a new intake duct to direct airflow to the scoop on the control arm.

sasportas

I've also installed the new rear brake ducts.

My experience (I don't have ceramic brakes) is that the rear rotor temps are decreased on average 150 degrees F with the newly installed ducts. This has been a good thing for this car. Especially with the slight increase in rear brake bias as compared to the 996. I don't detect as much fade or heat build up in the rear pads at the end of a 30 minute run group. Hopefully this will translate into better pad wear. Who knows?

Unlike Paul and others, I was simply in too much of a rush to install the new ducts and try them, that I did not trim the inferior portion of the tin rotor shield. I did notice that the GT3 comes with a shield that is trimmed at the inferior portion in a linear fashion in stock form. I also had to trim some of the plastic of the rear duct brackets to secure a good fit. I actually broke my first set of duct brackets while installing. I think that some of the lower control arms are slightly different on these cars.