Does anyone know if these are a different part number?

I'm running 997 Turbo Brakes all around and the rear calipers require more fluid resulting in a bit more initial pedal travel than I'd like. Otherwise, these brakes are great! Much more fade resistant (very similar to 9996 GT3 front setup with even bigger 4 post rears). Anyone know if any of the 997 master cylinders can be retrofitted to the 996? Even a small change in piston size will make a big difference in pedal feel.

 

Are you sure that there is no air in the system and that the fluid is topped off? Reason I am asking is I upgraded to the 996GT3 brake system, front and rear. After installation I had long pedal travel. My tech re-bled the brakes and the pedal travel was the same as before the upgrade. You may be right that the 997TT brakes need more fluid, I don't have the knowledge to tell you that. Just thought I'd give you something else to consider.

 

The 996 GT3 has a 6piston fronts and 4 piston rears. The 997 Turbo uses almost identical 6 pot calipers up front but had larger 4 pot pistons acting on 350mm rotors. The REAR brakes (for the 997TT) in my setup require more fluid compared to any factory 996 setup.

I will however have my tech bleed the system.

 

You could call Suncoast and ask them if all the master cylinders are the same for all the cars.

 

bumping this thread, did you find a solution, i am about to install the rear 997tt?

 

I have the same problem!!!

Any solution?

 

I have GT3 6-piston brakes up front. It would be great to have some type of master cylinder upgrade w/o extensive modifications.

 

It's very easy. Swap to the 997 GT3 master..

 

... and your custom brake line with adapter.