Complete set PCCB for 997S

[Stratocaster]

Anyone performed a swapout and installed PCCB brakes on the 997 GT3? As I understand, the wheel carriers will need to be swaped for the PCCB wheel carriers among other parts..Tried to use a set of PCCB's off of a 997S but the front brakes were different size....

This ad is not displayed to registered and logged-in members. Register your free account today and become a member on 6SpeedOnline!

[cid042]

I'm really surprised the 997 PCCB brakes were different. On the 997 C4S of my associate, we swapped the PCCB discs for 997 GT3 steels ones without any issue (except for the rear 997 GT3 pads that didn't fit, but shouldn't be an issue for you as, I think the GT3 rear PCCB calipers are the same in PCCB and steel - 350mm )

[996toomey]

The 997S PCCB front's are 350mm as are the steel GT3 Fronts. The PCCBs on the GT3 fronts are 380mm.

[cid042]

Originally Posted by 996toomey

The 997S PCCB front's are 350mm as are the steel GT3 Fronts. The PCCBs on the GT3 fronts are 380mm.

Yes, but the rears are 350 mm, aren't they ?

[greygt3]

Yes the rears are 350mm for both brake versions of the 997 Gt3.

[The Turbo]

Man why would you WANT PCCB - for track use they are an overall PITA.

[Stratocaster]

Originally Posted by The Turbo

Man why would you WANT PCCB - for track use they are an overall PITA.

True. I removed the ceramic and installed steel rotors on my 996 GT3. (gen I )Track car.
These will be for a street car though.

[NJ-GT]

PCCB are perfectly fine for track use, as long as the right fluid and brake pads are used.

There are two different PCCB systems: the 997 GT3/GT2/GT3RS/Turbo/CayenneTurboS and the PCCB for the remaining cars (Carrera,Cayman,Boxster). In the first generation there were two as well, but the Turbo was using the Carrera/Cayman/Boxster version, and the CTTS didn't have PCCB.

The rotor offsets on these two systems are not compatible.

997S PCCB can be used in a 996/997GT3 by changing the hats with the 996 GT3 PCCB front rotors and 996/997 PCCB rear rotors. Reuse the stock GT3 calipers and uprights. The hats are not sold by Porsche.

[The Turbo]

Oh boy, here we go AGAIN with the stupid PCCB debate.

Fluid has NOTHING to do with PCCB longevity (or, lack OF it)

[NJ-GT]

Originally Posted by The Turbo

Oh boy, here we go AGAIN with the stupid PCCB debate.

Fluid has NOTHING to do with PCCB longevity (or, lack OF it)

..and your track experience with PCCB is?

[The Turbo]

Evidently a hell of a lot more than yours.

Explain to us the merits of fluid with regards to PCCB longevity.........

[NJ-GT]

Originally Posted by The Turbo

Evidently a hell of a lot more than yours.

Explain to us the merits of fluid with regards to PCCB longevity.........

You mentioned the stupidity to have a conversation about PCCB, but not to a lot of people here may see PCCB as a stupid topic. There are Porsche owners not running PCCB and considering them for their future Porsches. There are concerns about track use, but we have been gaining experience on their features, strengths, weaknesses, running them at the track.

Boiling brake fluid leads to inconsistent piston brake pressure under braking. Once the fluid is boiling, not only the brake pedal becomes soft, this is just a symptom, the brake pads don't release from the rotors as normal, heating up the brake pads more than usual and this is the problem.

The problem is not the brake fluid boiling itself, it is the excessive heat gained by the brake pads once we get on these conditions, and then the brake pads falling apart.

PCCB rotors run at higher temperatures than cast iron rotors, at extremely high temperatures, the brake pads start falling apart, they crack and release chunks of material. On cast iron rotors this is not a problem, you're just carving grooves on the rotors, on PCCB you will wear the coat on the surface eventually releasing chunks of PCCB material. This happened to me with RS19 and stock Yellow or Black P90 stock Porsche pads.

I have been told to use the P50 Green MotorSport pad from Pagid specifically designed for PCCB, I have yet to try it.

My front PCCB rotors are due for replacement, due to these chunks. The second owner ran them at the track without checking brake pads conditions, and eventually wore out the surface coat. The rear ones are fine. The rotors have 5+ years of combined track/autoX/street use and close to 40,000 miles. These are Generation I rotors.

Generation II rotors are stronger, as seen recently on retired Porsche Driving Experience PCCB from 997 and 10,000 track miles from different drivers.

To ensure PCCB longevity:
- change pads if there are chunks or big cracks
- avoid getting on the ABS
- Use a cool down lap
- For 996 cars, install larger brake ducts, and make an opening on the front fender liners
- Replace pads when they're beyond 50% of material left
- Use a race brake fluid. If you don't flush the brakes at every track day, use Castrol SRF as it has the highest wet boiling point

[The Turbo]

P50 IS for PCCB brakes and he does have them at Rennstore.com - they are the Porsche Motorsports brake pad.

[NJ-GT]

I spoke to Craig (rennstore) about these Green pads (P50). They're a very hard compound similar to the Pagid Grey (RS-15).

I decided to pass on them and keep using the RS29, and replace them as usual. The RS29 and RS19 are very similar, but I like the initial grip on the RS29 better. I prefer to use a softer pad and replace it more often, than using a harder pad that will put more wear on the rotors.

When I calculated the proven 10,000 track miles from the PDE PCCB rotors on track days, the number got close to 80 track days. This is in line with PCCB Gen II lasting up to 6 times more than the cast iron rotors. Although running cast iron rotors is cheaper, most of the GT3 street car owners don't get to see 80 track days with this car, so PCCB are more than fine for combined track/autoX/street use.

There is a 3rd generation line of CCB by Brembo that has not yet reached the market for OEM but they're available. Unfortunately, the cost is higher, but they weigh half as much as the current PCCB. The full brake kit can take close to 90 lbs off on unsprung weight compared to the standard GT3 brakes, and close to 50 lbs compared to the PCCB brakes.

[The Turbo]

**He didn't say that - I know it because they are NOT like the RS15 Greys**