josbmw

Searched the forum, but couldn't immediately find an answer for the 718.

Does anybody know how much clearance there is between the brake caliper and the rim with the carbon ceramic brakes?
There seem to be issues with stones getting catched between the caliper and the rim, which results in scratches on the caliper and the rim, especially with 911's.

I also wonder how easy it is to clean the inside of the rims with PCCB's without moving the car.
I'm in a wheelchair, and moving the car everytime to clean a part of the rim is annoying, since I have to get out of my wheelchair and sit on the ground to clean the wheels.
This is not a problem with my current 981 GTS and steel brakes, I can easily clean the complete inside of the rim without moving the car.

The only reason I would buy PCCB's is brake dust, which is a PITA with the steel brakes on my current car.
But rims also get dirty from the road, so cleaning remains necessary.

VVG

It is tight. I have twice had issues with rim scoring by small rocks (presumably). There was no visible damage whatsoever to the caliper surfaces so I am not exactly sure where the rocks got stuck. It has not been of any real practical concern for me. The lines are not really visible unless you really get down and look for it, nor are the cuts deep enough to cause a structural issue.

There are several advantages to PCCB, IMO. You already mentioned the brake dust issue. You can basically wipe off the miniscule amount of dust with a dry microfiber towel. Unless you are regularly tracking, you will never have to replace the discs, and possibly not even the pads, for the life of the car. Finally, the significantly reduced unsprung weight helps a lot with ride quality. I have ceramics on my Spyder and my daily driver Audi RS5, and love the initial bite. Gives you a lot of confidence.

slm9555

You can’t get carbons on the gts, only steel. In the past you could get carbons; but not sure when this changed.

josbmw

Not correct. I just ordered a Boxster with production March 2024 and the PCCB's will be available again for my production date according to my dealer.

TXshaggy

I’m sure more would want to understand this availability.

Did you receive a Porsche Build Code with them included? Please share if that’s the case.

Or is it a case of “will be” meaning some future availability? If so what build week do they become available?

Congrats on the allocation!

Keith4.0

I believe the OP is in Europe. I jumped over to the Belgium configurator and PCCB is available. Maybe they will be offered here in the US later. Only the first build for North America was available with PCCBs. These cars were delivered in Nov/Dec 2020. I'll check the clearances on my car but no guarantee the new ones are the same P/N and size. The PCCBs on the GTS 4.0 were smaller than the GT4/Spyder.

Keith4.0

Internation Configurator

Looks like I was seeing this on the international configurator. Not sure this represents something you can actually buy. I don't see PCCB available on any region specific configurators.

josbmw

I ordered my car in Germany. PRDE6Y26
Site is in German of course.
The dealer configurator showed it as available, but I don't rememer the exact date. Production is planned March 2024, and dealer confirmed PCCB would be available by then.

037

The configurator says, “350 mm vorn und hinten, 6-Kolben-Bremssättel an der Vorderachse und 4-Kolben-Bremssättel an der Hinterachse,” so you’re getting the same PCCB calipers and discs for all of the 718 non-GT cars.

The 718 (non-GT) PCCB front calipers are identical to the GTS 4.0 iron caliper aside from color. The rear are also identical but have ~10mm taller mounting posts to accommodate the 350mm discs.

The photo in the configurator is incorrect in showing what appears to be 410/390mm rather than 350/350mm per the information provided. This happens often with the configurator.

Since the larger GT4 size calipers and discs aren’t directly compatible with the standard 718 knuckles, 350mm front and rear is correct.

Wheel to caliper clearance therefore won’t be an issue.

HTH

Joe250

I believe the 718 GTS brake calipers are the same as the ones that come standard on the GT4. However, they mount closer to the axle on the GTS and therefore run smaller diameter rotors than the GT4.

037

Both calipers can accept the same pad profile but the castings are very different.

GTS 4.0 calipers are on 142mm bolt spacing and have 30/32/34mm stainless steel pistons. They can accept a 350mm rotor but can't be spaced out to 380mm due to the angle of how the bolt holes are drilled into the casting. 991.1 and 991.2 Turbo calipers share the same body but have taller posts to accept 380mm rotors natively. They can accept up to a 34mm wide disc.

GT4 calipers are on 225mm bolt spacing and have 30/30/30mm stainless pistons with ceramic caps to minimize heat transfer into the fluid by way of the pads. They can accept between 380 and 410mm rotors depending on spacing (which varies by part number). They can accept up to a 36mm wide disc depending on the length of the pad retention bolts (which also varies by part number).

GTS 4.0 caliper left (9P1-615-123-T) vs GT4 caliper right (991-351-428-86):

Joe250

I stand corrected. Excellent info!

Keith4.0

GTS 4.0 front PCCB
Cleaning is not a problem and the clearance is too large to trap stones.

josbmw

Thanks, that was the info I needed. The picture makes it very clear there are no issues.
Dealer had no 4.0 GTS with PCCB. Hard to find anyway at a dealership over here...

josbmw

Final configuration went in yesterday.
I ended up with this (I ordered the car in Germany, so no English) https://configurator.porsche.com/porsche-code/PRH4EDN7