Some very interesting talking points... Except for the price. Wayne Gerdes – CleanMPG – Nov. 27, 2017 About the size of a dinner plate and thick as your thumb, the brake disc makes driving safer by significantly reducing stopping distances. There is another reason albeit little known reason why brake discs notoriety is coming to the forefront. It Is called “Brake Dust.” Most particulate emissions does not come from the internal combustion process but road, tire, and brake wear! I did not know this until a Bosch release brought it to my attention. According to a German environmental agency, brakes and tires are responsible for 32 percent of driving-related particulate emissions, roughly half of which is brake dust. Significantly reducing brake dust is essential to improving the air we breathe. A Bosch subsidiary, Buderus Guss, has developed the iDisc. Compared to a conventional brake discs, it generates up to 90 percent less brake dust! The unique selling point of the iDisc is a tungsten-carbide coating that is currently only available from Buderus Guss. Every year, the company produces up to 20 million discs. To transform a conventional disc into an iDisc, the friction rings are mechanically, thermally, and galvanically treated before being coated. All this is part of a process developed by Buderus Guss and Bosch researchers. In terms of price, the iDisc is approximately three times more expensive than a normal cast iron brake disc, and three times less expensive than a ceramic brake disc. The price is likely to fall as production volume increases. The iDisc is a simple drop in replacement to the conventional cast iron brake disc and could become the new standard. For cars alone, demand for brake discs are > 330 million worldwide in 2016 alone. Another argument in favor of the iDisc beyond the order of magnitude reduction in brake dust is that the carbide coating also ensures greater safety. The braking performance mimics that of a ceramic brake, especially when it comes to fading, as the reduction in stopping power following repeated braking maneuvers is known. Like a ceramic brake disc, the iDisc is highly stable in this respect and loses little deceleration performance. If you are driving hard enough to need ceramic discs, you do not give a damn about the environment… Wear is also significantly reduced. Depending on the strength of the carbide coating, the iDisc’s service life is twice that of a normal brake disc. Gouging marks on the friction ring? Not a chance. Corrosion is also not an issue – a major advantage, especially in electric cars. Because they recover braking energy, electric cars put less strain on the brakes and often must contend with rust formation on friction rings. The temporary slight decline in responsiveness during braking associated with this does not occur with the iDisc. A lot of puffery in this paragraph so keep that in mind. Another benefit is brake disc’s shiny carbide coating looks good, is wear-resistant, and corrosion-free. The 90 percent reduction in brake dust eliminates the need to regularly clean rims from brake dust residue. The iDisc is currently in production for a yet to be named European manufacturer.