Assessing brake wear particle emissions and performance characteristic of NAO-ceramic formulation for Euro 7 Compliance

EU7 regulation has focused on non-exhaust emission from brake and tire wear and has set the brake particle emission limits accordingly. The current PM10 limit is set at 7 mg/km for IC vehicles and 3 mg/km for EV (electric/battery vehicles) of M1, N1 category. Hence, the brake particle emissions test should be conducted according to the UN Global Technical Regulation No. 24 (GTR-24) procedure on the brake inertia dynamometer. Due to these new requirements; brake systems need to be homologated with regard to EU7 emissions limits. In this study, NAO-ceramic formulation is developed and tested for performance, wear, noise and brake emission on brake inertia dyno using the global standards such as SAE J2522 (AK-Master Performance), SAE J2707B (Block Wear Test), SAE J2521 (NVH) and, Emission Test (WLTP/GTR-24. The developed NAO-ceramic friction grade not only having better friction, wear and NVH properties, but also reduce the brake emissions substantially and meets the current PM10 limit (<7 mg/km) as per the WLTP/GTR-24 procedure.