For manufacturing this automotive product, a mixture of different raw materials was used to assure the integrity of its abrasive parts. In order to provide the resistance needed to sustain the heat produced by the friction process, asbestos was used heavily for this type of product.
By being subjected to heat over and over, the asbestos would become friable and be released during the cleaning stage of the disc brakes replacement. Most of the people that were subjected to the exposure used compressed air in order to remove the dust, making the environment quickly contaminated, instead of minimizing the risk of inhalation by using liquid brake cleaner. You could have been exposed if: