Disc Brake System: Description and Operation

Porsche Ceramic Composite Brake (PCCB)







As with the previous model, the new 911 Turbo can be equipped with the optional Porsche Ceramic Composite Brake (PCCB).

With its proven design dimensions and features, including front brake discs with a diameter of 380 mm, the PCCB offers the following familiar advantages over a brake system with steel brake discs of comparable design and size:

- Faster response on dry road surfaces
- Very high fading stability through constant friction values
- High safety reserves at high loads
- Approx. 50% less unsprung mass than comparable grey cast iron brake discs with the same diameter
- Corrosion resistance of the brake discs







The following features have been modified:

- Screw connection of the ceramic brake discs to the front axle with clip-type springs

On the new 911 Turbo, the PCCB on the front axle features a modified screw connection between the brake disc hubs and the brake discs (friction rings). Clip-type springs are used in addition to the screws and specially shaped threaded sleeves. This design allows limited axial displacement and improves radial compensation between the brake disc hub and brake disc. This improves true running of the brake discs under high thermal load and prevents brake judder even under extreme loading.
The acoustic insulation of the brake discs is also improved as a result and the noise level is reduced. On the rear axle, the familiar and proven screw connection technology is used with several screws and specially shaped threaded sleeves. This technology guarantees a fixed axial connection and at the same time allows radial expansion compensation for the different materials between the brake disc hub and brake disc.