sorry for my repeated replies but something happens during upload of photos...

 

I will do so in my next opportunity to lift the car...sorry i dont have any inside photos now...you can see low end clearance at close photo...

 

Obviously the color of the caliper has no bearing here. The 996TT can use both the 4 piston and 6 piston calipers with with 146mm spacing. Both are a very simple direct bolt on with the 4 piston using 330mm rotors and 6 piston using 350mm rotors. You can also space out the OEM 4 piston calipers with spacers and longer 85mm bolts if you'd like to use 350mm rotors. As a matter of fact, you can space out the OEM 996TT 4 piston calipers to use 380mm rotors (or any size depending on spacer thickness) but you can't space out the 6 piston calipers. Why? Well, very simple.

The stock 996TT front 4 piston caliper uses a 146mm bolt pattern that is spaced with respect to the center line of the caliper. This caliper can be spaced out to your hearts content because as you add spacers the caliper moves out at a 90 degree angle relative to the brake rotor centerline (same goes for the 225mm 997.2 calipers).

On the 146mm 6 piston caliper the bolt spacing is also 146mm. The major and very important difference, however, is fact that the the bolt pattern is not positioned on the caliper with respect to it's centerline. This fact precludes the caliper from spacing out at a 90 degree angle with respect to the centerline of the rotor as spacers are added. As spacers are added the caliper "moves" away from the center line of the rotor at an angle which causes the rotor/caliper gap between the lower portion of caliper to decrease and the upper portion of the caliper to increase.

This is very hard to explain or visualize unless you actually have the caliper in front of you. When you get a chance, please post a picture of your 146mm 6 pistons with spacers and 380mm rotors, front and back side showing the spacers. I would really love to see how you managed to get this to work.... Thx...

 

I am not in position to be aware of what went wrong when you tried to install 350mm calipers to 380disks...
Facts are facts and an engineering project is judged from its outcome...and guess what...we have two cars here with 350mm calipers running 380mm pccb disks...
upper and lower bolts are positioned in PARALLEL from the factory...so no matter how far or close they are spaced from wheelhub they will always be in parallel...I believe we both agree on that...
It really makes no sense to be able to space out 4piston caliper how far you like and not been able to do the same to 6 piston...SINCE THEY BOTH BOLT AT THE SAME wheelhub...
All i have to say is that when i was installing them i tried 15mm spacers and low end didnt clear out...So i tried 18mm spacers and everything was ok..
One of my photos shows crearly low end clearance from disk to caliper...i will photo inside side for you at first opportunity...
P.S. I mentioned colour so to see that we are talking about OEM red 997TT steel calipers

 

Sooo.... Finally... did the PCCB Discs and rotors will fit a 997.2 tt with red calipers if I just add the 18mm spacers and longer bolts???
Please skandalis 447 confirm me.
Thanks and Happy New Year to All!!

 

Take a long hard look at the mounting arrangement of the 997.1 350mm calipers, 996TT 330mm calipers, and the 997.2 380mm calipers. This should explain what I meant by the 997.1 calipers NOT spacing out radially. They space out at an angle unlike the 996TT or 997.2 calipers which space out radially. As you add spacers, the bottom of the 997.1 caliper will contact the rotor. You can not just add an 18mm spacer and longer bolts because of this. The only way to do it would be to have a custom machined spacer bolted to the upright and then have the 997.1 caliper bolted to that spacer but offset so that it is re-centered relative to the rotor centerline.

Why do you think on the cars with 997 PCCB 380s Porsche used an adapter in conjunction with the 997.2 calipers instead of just using simple 18mm spacers and longer bolts with the 997.1 calipers?

997.1 350mm




996 330mm




997.2 380mm

 

Wow how times change, 10 years ago people were removing their ceramic rotors and install steal because of the replacement costs and the fact very few had cracked.

 

They still are. I run steel 380s and it's pretty rare to see a track guy with ceramics. They usually run them till they get trashed and then swap to steels. Pad selection is very limited with ceramics too.

 

I have them in my car around a year now...porsche has two kinds of six piston calipers and wants to sell both...

 

Are the red 997.2 RS calipers the same as the Yellow PCCB 997.2 calipers? I have a source selling a set of PCCB rotors and pads, but not sure if they're a direct swap or if I need the yellow calipers?

 

They are the same.

 

Actually thats the case...ceramic pads are way too expensive...they really have porsche tag...however I simply cant resist to amazing initial grip and awesome braking power of pccb...one of the best options for 997tt for sure...

 

Thanks pwdrhound. So all one would need to go to pccb on a 997.2 rs is rotors and pads?

 

Yes, that is correct. Turbo specific rotors if you have a TT. GT2/3 have different offsets on the front. Rears are the same.

 

Are the piston sizes the same front and rear? I want my PCCB calipers painted red but if I can simply buy the red GT3RS calipers Ill do that.