It sounds like you are concerned about the health effects of brake pad dust. While this is a topic of ongoing research, there is evidence that brake pad dust can contain harmful particles that may pose health risks, particularly to workers in the automotive industry and potentially to the general public in areas with high traffic.
Brake pads can release fine particulate matter (PM) as they wear down. This dust can contain a mixture of metals, including copper, asbestos (in older brake pads), and other materials that can be harmful when inhaled. Prolonged exposure to fine particulate matter has been associated with respiratory issues, cardiovascular diseases, and other health problems.
To minimize exposure, it's essential to follow safety guidelines, especially for those who work in automotive repair and maintenance. Additionally, using brake pads that are certified to be lower in harmful substances can also help reduce risks.
If you have any specific concerns or would like to discuss this topic further, please let me know!