Hi,

I have 6pots calipers from a 997 turbo and 350mm discs in my 996TT.

I would like to upgrade the front discs to 380mm (Brembo).

Can I do it with adapters? The 380mm discs are compatible with the normal (not for PCCB) 6 pots calipers?

Thanks,

 

Do not waste your time. You need the calipers that are used on the 997 PCCB TT or GT2/3 PCCB cars. I used to run the 996GT3 six pots with 350f/350r rotors. I have explored the option of going to 380s while spacing out the calipers but it can NOT be done using the 997TT(with steel)/996GT3 6 pot calipers (w/ 146mm bolt spacing) due to their offset mounting design. This caliper will not space out radially. As you try to space it out it will impact the rotor at the calipers bottom edge. It's hard to explain without actually trying it.

I ended up having my 996TT based car converted to 380mm front and 350mm rear steel floating rotors but the only way to do this is to use the 997.2 PCCB calipers (225mm bolt spacing) that are used on the 997TT with PCCB or the 997GT2/3 with PCCB. These are designed for use with 380mm front and 350mm rear rotors. The front 997TT or 997GT3 PCCB calipers are visually the same but the piston area is about 10% smaller on the GT3 calipers which will give you a touch more rear bias and a slightly harder pedal. I have both the GT3 and TT versions but have not compared one to the other yet. When you do this conversion, you will need to upgrade the brake master to the 997GT3 27mm version to firm up the brake pedal as you will be pushing more fluid due to the larger 34mmx2 rear piston calipers. It goes without saying that you will need to upgrade the rear calipers to the larger 997TT/GT3 units with 350 rotors other wise your brake bias would be totally wrong.

I tested this brake set up at the track last weekend and it is phenomenal as far as heat dissipation goes. The greater rear bias from the larger rear calipers works extremely well and with the larger 997GT3 master your brake pedal is rock hard. This system is far superior to the 996 GT3 six pot 350/350 set up that I ran before. It does not necessarily brake any better than the 996GT3 350mm set up, or the stock TT 4 pot 330mm set up for that matter, but it does provide HUGELY better thermal dissipation when you hammer the car at the track for extended periods and it does shift the brake bias to the rear which does help braking performance a bit compared to the 996 system. I do have all the GT3 cup cooling ducts on my car which further helps with cooling. The one thing you will need to be careful of is the selection of wheels if you run the 380mm set up as only a hand full of 18" wheels will clear those brakes. My track 18x9 front wheel will clear the 380 calipers with about 3/16" to spare but they are manufactured to work with the 380 set up. The silver 5 spoke wheels are 19x9/12 and the grey track wheels are 18x9/12 in the pics below. Hope that helps.

 

thanks pwdrhound, im planning nearly the same for my next setup. at the moment im running the 996 turbo system with 997 350 mm rotors.

normaly i Want to upgrade to the complete 997 gt3 system with 6 pot and 380 mm rotors in the front and bigger 4 pot with 350 mm rotors in the back. rotors are slotted and from brembo.

so you think the GT3 brake master is necessary for this setup?


Greets and congratulation to your nice setup

 

you have adapters for the bigger masters from the 997, because of the bigger bolt spaces? Self produced?

 

In my opinion it is absolutely mandatory to upgrade to the larger 997GT3/TT brake master otherwise your brake pedal will have a "softer" feel to it. My brake system feels absolutely identical to my friends 997GT3 PCCB system. Pedal is hard as a rock and modulation is fantastic.

 

There is no adapter to use without requiring further modifications. I've very particular and like any mods to be done to OEM quality so I fabricated new brake line with a 10mm and a 12mm end. You can see this discussed in the following thread. See post #22 for pictures.

https://www.6speedonline.com/forums/...on-27mm-2.html

 

and for the 6 pots and the bolt spaces to fix these you dont need any adapters? because I have the normal 4 pots at the moment, I think these have only 146 mm bolt space and the bigger 6 pot ones from the 997 GT3 have 225 mm? thanks for the replies!

 

Yes, you are correct on the bolt spacing. The 997TT/GT3 380mm brake system is a direct bolt on to all 996TT/GT2/GT3 cars using all factory Porsche parts. However, you must use the adapter bracket that Porsche uses on the 997TT PCCB cars to adapt the 225mm spacing PCCB calipers to the 146mm spacing hubs. It is made by Brembo for Porsche. The part number is 997.351.505.02. The adapter is pictured below. You also need the adapter bolts part number 999.073.313.09 and caliper bolts part number 999.067.054.09. Additionally, you need to change out the hard brakes lines in the front to part number 996.355.587.03 and 996.355.588.03 so you don't have to re bend the stock lines to fit.

 

Thank you very much!! You helped me a lot and now Im also nearly ready for my brake upgrade
The screws for the caliper and the adapter are only 1 piece when you order it with the Porsche number or they came as a set of 4 pieces?
The yellow PCCB and the red calipers for steel rotors have the same dimensions and can be used both for steel or ceramic rotors?

 

The caliper brackets, bolts, etc. are all sold separately. Both the yellow and red 225mm spacing calipers have the same dimensions and are interchangeable. What rotors will you be running?

 

I went with the StopTech Trophy Kit. I tried the race pads and they were Awesome!!!! Amazingly strong, fade free set up. I'm now using the more street oriented pad, and although it is not as strong as the race pad, it is awesome as well.

GO StopTech!

 

Im not 100% sure about the Rotors, maybe I will buy the Brembo slotted rotors or when I find a good offer maybe the PCCB version.
But I think both will be a good decision
Movit is also offering a 396 mm Ceramic version for the front and up to 362 mm for the back, but its not cheap at all....
You are running Iron Brembo slotted rotors, happy with them?

 

I found this in another Forum

So the 996 hard brake lines you are recommend are working fine with the 997 calipers or I should switch to the 997 hard brake lines?

 

Hi,

With the 997TT/GT3 PCCB calipers I should by disc for 997TT or GT2/GT3 (the offsets are different!!)?

Thanks,

 

I run Girodisc rotors 380 front and 350 rear. I'm very happy with them. Because of the narrow annulus design (as are all 380 iron rotors) the 380mm version weighs exactly the same as the 350mm version which is nice so you're not giving up anything in terms of weight when you upsize. The 380 Giros are actually lighter than the OEM 330mm one piece rotors! The Brembos at their price point just did not make sense and I like the fact that replacement rings and hardware is very easy to get for the Giros. The brake pad selection is fairly limited for any of the 380mm narrow annulus rotors so you have to take that into consideration. In other words, you can not run the same pads on the 380 rotors that you use on the 350 rotors.

Yeah, the MOVIT stuff looks great but at over $20K for the rotors....well, no comment there... With the Giros, I can run the hell out of the brakes at the track all year and then just replace the rings and hardware for about $1500 for the whole set. Works for me....