From the Porsche 997 launch press release:

"Reinforced brakes on 911 Carrera S

The 2005 Porsche 911 Carrera stops with the sort of certain authority that characterizes the dynamics of all Porsche vehicles. The new sports car has 12.51-inch (318 mm) front rotors and 11.77-inch (299 mm) rear rotors, all cross-drilled and inner-vented with black-colored, monoblock, four-piston calipers. This is the same hardware found on the 2004 Porsche 911 Carrera, except that the power of the brake servo has been increased by 17 percent to 4.5:1, reducing the force needed on the pedal and providing more spontaneous braking response.
Brake cooling also improves for 2005, thanks to the new front axle pivot mounts and enhanced under- vehicle airflow.
The 2005 Porsche 911 Carrera S has even larger brakes: reinforced four-piston monoblock red- painted fixed calipers front and rear with 13-inch (330 mm) front and rear discs and larger brake pads."

"Porsche Ceramic Composite Brakes

For the first time, Porsche Ceramic Composite Brakes are available on the 911 Carrera and 911 Carrera S. Previously, they were available only on special models, such as the Porsche 911 Turbo.
Instead of metal, the 13.78-inch (350 mm) brake discs are a ceramic composite material that provides high and consistent levels of friction during application. They also weigh approximately 50 percent less than metal discs and thus reduce unsprung masses by 34.4 pounds (15.6 kg) per vehicle.
Ceramic brakes help reduce brake pad abrasion compared to metal brake discs because of the extremely hard surface of the ceramic discs and because ceramic discs cannot corrode and are not affected by elements such as road salts used in winter months.
For 2005, the Porsche Ceramic Composite Brakes are more rigid, yet include more interior cooling ducts. Fiber reinforcement on the friction surface is increased, significantly enhancing resistance to abrasion under high loads."

From the Porsche 997 turbo launch press release:

"Upgraded braking system

The 2007 911 Turbo features a brake system even more efficient than on the former model. The brake concept on the front wheels has been carried over from the Carrera® GT, with six-piston brake calipers in conjunction with 350mm (13.78") brake discs ensuring impressive stopping power. The new brake configuration also feeds more brake power to the rear wheels, where four-piston brake calipers again interact with brake discs measuring 350mm in diameter. Two other features are pre-loading of the brake system and Brake Assistant, both serving to shorten stopping distances even further when applying the brakes suddenly. The new 911 Turbo is also available as an option with Porsche Ceramic Composite Brakes (PCCB®) for truly outstanding braking qualities ensured by ceramic brake discs, and further developed in even larger dimensions than before."

"For extreme requirements: Porsche Ceramic Composite Brakes (PCCB)

The new 2007 911 Turbo has available as an option Porsche’s well-known Porsche Ceramic Composite Brakes (PCCB). Benefiting from the high-tech ceramic material, the brakes respond even more quickly to the driver’s commands, remain extremely stable even under heavy use with virtually no fading thanks to their consistent frictional coefficient, and are absolutely immune to corrosion.
The new Turbo comes with enhanced brake disc technology using an even stronger material for minimum abrasion, and inner cooling ducts in an ‘Arcus’ design for enhanced cooling and brake stiffness. To increase braking power on the 2007 911 Turbo, PCCB brake disc diameter on the front axle is up to 380mm (14.96”) from (350mm/13.78”) on the previous model, precisely the same diameter as those featured on the Carrera GT together with its six-piston fixed calipers.
At the rear, in turn, four-piston fixed calipers act on brake discs measuring 350mm in diameter. And despite the larger brake discs, PCCB is approximately 17 kg (37 lb.) lighter than the standard brake system with cast iron discs."

Summary:

Standard Carrera brakes (black calipers) feature 4-piston calipers and 318 mm rotors. Carrera S brakes (red calipers) feature 4-piston calipers and 330 mm rotors. Optional PCCB brakes for Carrera and Carrera S models (yellow calipers) feature 4-piston calipers and 350 mm rotors.

Standard turbo brakes (red calipers) feature 6-piston calipers and 350 mm rotors. Optional PCCB brakes for turbos (yellow calipers) feature 6-piston calipers and 380 mm rotors.

 

Some people over think these things...

 

To further complicate the already confusing color scheme that Porsche has chosen for brake calipers among various models, you can order custom painted caliper colors when you order your car.

 

I just love the job that Porsche engineers did with the IMS! I still can not believe that so many of these cars are ticking time bombs ready to go off at any moment.


Hard to imagine that they continued with the same design for so many years?


I am convinced that many German cars are designed to incur significant and costly repair shortly after the warranty expires in order to generate new car sales

 

Well stated!