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It is a known fact that electric vehicles reduce car exhaust as a source of particulate emissions, there are other sources of pollution like brakes. While an EV does use regenerative braking, the physical brakes are used as well.

In a recent development, those responsible for writing Euro 7 regulations will be setting new limits on 10- and 2.5-micron particulate emissions on all new vehicles—including EVs—starting next year. To help manufacturers achieve this, Brembo has developed a new brake and pad set called Greentell that it says cuts brake dust emissions by 90 percent, improving durability in the process.

"We started 10 years ago to investigate a different solution. The main topic that we had in mind was to develop a disk that is greener than the current production of cast iron," said Fabiano Carminati, VP of disc technical development at Brembo.

"Greentell is the best compromise from a green point of view and [for] performance because the direct pleasure of the end user is a must for us," he said. "So the goal is to find a coupling that mixes the best driving pleasure with the best green product. Green means low emission and green process. It was a really difficult challenge for us. We invested a lot of time; we invested a lot of money."

Carminati said that Brembo investigated a range of solutions before settling on using laser metal deposition. Physical vapour deposition, as used as a durability coating for wristwatches and firearms, was ruled out due to cost.

Along with the reduction in brake dust, there's an 80 percent reduction in surface corrosion compared to conventional brakes. However, they won’t last forever.

"The thickness of the layer that we apply is not so high—we apply just 100–120 microns. That means that the disk is not a lifetime disk," said Carminati. That said, Greentell brakes should need replacing less often.

He also feels Greentell brakes would make their way into performance cars, where there is a lot of heavy brake usage.

Source: Ars Technica

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