I have been running a full set of 997 turbo 350mm front and rear brakes on my car for almost 2 years with GREAT success. The brakes definitely work better and are a much more fade resistant (the factory brakes were great as is of course). Especioally given the 200HP wheel HP output difference. 530 AWHP is almost exactly 200 more AWHP than a 420 HP turbo puts out.

The only downside has been mushier initial brake pedal due to the increased volume in teh 6 pod and larger 4 pot 997 turbo brake calipers.

Does anyone know if the 997 turbo or GT3 (rs) master cylinder can be retrofitted to the 996?

 

Great question - I'd love to know.

 

What type of brake fliud are you using and how often are you flushing the system?

 

I had the same problem here.

To resvolve it I reinstall the 996TT rear calipers.

 

I have a friend that upgrade only the front calipers (6 pots) and install the 997 GT3 central break pump. He told me that this pump is the same that audi use in one of its models. I will go ask him for the part number.

http://img232.imageshack.us/img232/9...0517161816.jpg


I think this will help you to resolve the problem.

 

I've been saying this for the longest, but the 6piston OMG fanclub doesn't like to hear it. My car has better brake response with 4 piston calipers (for 2-3 laps at least )and this is probably the reason why.

What the 996 TT REALLY needs is better utilization of the rear calipers. It's ridiculous how little those things are even used. Couldn't imagine how fast the car would stop with stronger rear bias and more boost to the fronts with 6 pots.

Makes my mouth water a little thinking about it.

 

Does anyone know if the 997 turbo or GT3 master cylinder parts different? I believe the 997 GT3 has even bigger 380mm front brakes?

 

Anyone??

 

the gt3 rs (or pccb brake cars) use the master cylinder with a 27mm bore size, instead of the 25mm bore. It will fit the 996 fine but you will need a line adapter for the one exit port as BOTH ports on the gt3rs are the larger 12mm instead of one 12mm and 1 10mm on the stock 25mm master. Oh it also uses a pressure seal aganist the booster instead of the oring but fits fine.
I've always used this larger master cylinder and it will improve pedal pressure with the larger brakes.

Suncoast and fvd both sell this part (the fvd site shows the new seal to the booster)

Cayman S & 997 (with standard brakes) – 997.355.910.00 – 23.8 mm bore
Cayman S & 997 S (with PCCB brakes) – 997.355.910.10 – 25.4 mm bore <<<< stock 996tt bore
997 GT3 - 997.355.910.30 – 27.0 mm bore (this is the one I use from suncoast) http://www.suncoastparts.com/product//SKUGT3BMC.html <<< also 996 tt bore WITH pccb brakes btw


or http://www.fvd.de/us/en/Porsche-0/-/...nder-27mm.html

 

what is the 996tt bore? This is some great info, i would really like to do this as well.

 

And any clue as to where we can get the adaptor for the 12/10mm thing?

 

996 tt stock bore is 25mm/25mm,


I got the last adapter at autozone, brass in the brake section..10 to 12 mm adapter. However this one from autozone had slightly to short a depth in the reduced 10mm area, not giving enough thread enguagement. Other adapters seem to be aOK..what I did was machine the brakeline nipple end down (ie turned off the non threaded end) thus allowing it to enguage more.
The other way is to have a custom line made with 1 end 10mmthread and the other 12mm thread. Or for that matter get 1 10mm to 4an, and 1 12mm to 4 an and use braided steel line. Many ways to connect it up. I have not tried it but there probably is a factory line for the larger cylinder as well.


I actually would like a 30mm bore but thats not happening...lol

 

Running endless fluid and flushing annually.

 

link for adapter fitting in steel

http://www.brakequip.com/mfthread.html

 

Would this be the correct 12 to 10mm adapter fitting with a bubble type flare on both the male and female end??

http://www.autozone.com/autozone/acc...er=978150_0_0_