This review summarizes emission factors for brake emissions from light-duty vehicles, focusing on those following the Global Technical Regulation (GTR 24) methodology. Brake emissions contribute significantly to ambient particulate matter (PM) pollution, especially as exhaust emissions decrease. Non-exhaust emissions, including brake wear, have increased, prompting the European Union to introduce limits under Euro 7. The study reviews emission factors from literature, compares them with roadside measurements and emission inventories, and discusses reduction efficiencies of various brake technologies. Key findings include that brake emissions account for 30–45% of total PM emissions, with NAO pads reducing emissions by at least 60%. Advanced discs and regenerative braking can further reduce emissions. Emission factors vary based on vehicle mass and brake type, with ECE pads emitting around 3 mg/km/brake per 1000 kg of vehicle mass. Roadside measurements show lower emission factors than laboratory estimates. Emission inventories align with the study's findings. The study highlights the importance of accurate emission factors for assessing the environmental impact of brake emissions and developing effective mitigation strategies. The results are based on studies following GTR 24, which standardizes measurement procedures for brake emissions. The study concludes that emission factors are essential for estimating the contribution of brakes to air pollution and for evaluating the effectiveness of new technologies in reducing emissions.This review summarizes emission factors for brake emissions from light-duty vehicles, focusing on those following the Global Technical Regulation (GTR 24) methodology. Brake emissions contribute significantly to ambient particulate matter (PM) pollution, especially as exhaust emissions decrease. Non-exhaust emissions, including brake wear, have increased, prompting the European Union to introduce limits under Euro 7. The study reviews emission factors from literature, compares them with roadside measurements and emission inventories, and discusses reduction efficiencies of various brake technologies. Key findings include that brake emissions account for 30–45% of total PM emissions, with NAO pads reducing emissions by at least 60%. Advanced discs and regenerative braking can further reduce emissions. Emission factors vary based on vehicle mass and brake type, with ECE pads emitting around 3 mg/km/brake per 1000 kg of vehicle mass. Roadside measurements show lower emission factors than laboratory estimates. Emission inventories align with the study's findings. The study highlights the importance of accurate emission factors for assessing the environmental impact of brake emissions and developing effective mitigation strategies. The results are based on studies following GTR 24, which standardizes measurement procedures for brake emissions. The study concludes that emission factors are essential for estimating the contribution of brakes to air pollution and for evaluating the effectiveness of new technologies in reducing emissions.