Did Porsche reinvent the brake rotor?


Porsche has a new type of brake rotor called the Porsche Surface Coated Brake (PSCB) system.Introduced on the current generation Cayenne Turbo, the PSCB uses tungsten carbide coated rotors designed to offer better performance, as well as certain aesthetic advantages. Everything is detailed in this Engineering explained video.

You can spot a car fitted with PSCB because the rotors have a mirror finish. The tungsten carbide coating also reduces brake dust (by 90%, according to Porsche), which Porsche tried to emphasize with the white calipers of the Cayenne Turbo Coupé seen in this video.

It’s not just a question of looks. The rotors help reduce discoloration of the brakes and their lifespan is about 30% longer than the alternatives, according to Porsche. Unlike conventional cast iron rotors, they will not rust either.

Porsche Cayenne Turbo 2019

PSCB tries to divide the differences between the cast iron rotors and the more expensive but more efficient carbon-ceramic brakes. The rotors start as ordinary castings which are then galvanized and coated with tungsten carbide. The 0.1 millimeter coating is sprayed on the rotors at supersonic speeds.

When this thin coating wears out, the entire rotor must be replaced. But Porsche says the coating is so durable that PSCB rotors will last even longer than conventional rotors. Engineering explained Jason Fenske noted that brake pads tend to wear out faster than rotors anyway.

The PSCB is standard on the Cayenne Turbo and Cayenne Turbo Coupé, and a $ 3,500 option on the base Cayenne models. To put that into perspective, carbon-ceramic brakes are a $ 9,000 option on the Cayenne.

Fenske also obtained quotes on replacement costs (before work) from a Porsche dealer. Standard iron rotors were $ 2,343.15, PSCB rotors were $ 11,095.10 and carbon ceramics were $ 32,206.74. At this price, it might be better to just buy another car.


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