The automotive industry has been looking to develop brake systems to reduce the particulate matter emissions. The braking system is becoming a vehicle component to be regulated for the particle emission as exemplified by the new EU 7 regulation. The solution found should be compliant with the EU 7 for fine dust reduction up to 7 mg/km per vehicle and technical functionality in order to be reliable achieving a service life of 200,000 km or 10 years. Different solutions are being studied to be applied for all the brake industry. Starting from the firction materials, coated rotors and power train electrification. In order to measure the effects of wear it has been historically used a chassis dynamometer system, which allows to simulate a brake system in a controlled environment.. The driving cycle chosen is the recently developed WLTP (Worldwide harmonized Light Vehicles). This new test cycle would represent the real working conditions of a braking system and the wear, particularly in light-duty vehicles. To collect PM and measure PN, the dynamometer system is coupled with a Particle Counter and Impactor system. In this work, will be presented different combinations of gray cast iron and different coated rotors with ECE material. Together with different brake sizes and caliper types. We will show wich is the effect on PM10 measured using the WLTP cycle between those diffent brake systems.

Mr. Agusti Sin, Materials & Process Innovation Director, ITT Friction Technologies