Regulations by a number of U.S. states limit the amount of asbestos, copper and other constituents used in vehicles’ brake friction materials. States require that an approved third-party lab tests the levels of regulated constituents in friction materials.
Level A: limits levels of asbestos, cadmium, chromium, lead, and mercury.
Level B: Includes all the requirements of Level A and copper levels must be less than 5% by
Level N: Includes all the requirements of Level A and copper levels must be less than 0.5% by weight.
ECE R90 (E-MARK)
ECE Regulation 90 calls for linings to be tested for speed sensitivity, cold performance, and replacement Brake pads and brake shoes are permitted to deviate from the frictional characteristics of their original-equipment counterparts by not more than 15%.
In addition, R90 requires tamper-evident, sealed packaging for replacement brake linings. Type-approval to R90 is required for all replacement brake linings throughout the European Union and in non-European countries that have adopted ECE Regulations.
AMECA-accredited under SAE J661 and approved quality. The AMECA certification is a requirement for companies wanting to import any friction material into the USA.