This procedure describes a method for measuring the fraction of underlayer (also referred to as backing layer) existing at any given height above the a disc brake friction materials shoe plate. Measuring underlayer distraction is useful for computing useable lining thickness and for friction material quality management.
SAE J2724-2016 history
2016SAE J2724-2016 Measurement of Disc Brake Friction Material Underlayer Distribution
2012SAE J2724-2012 Measurement of Disc Brake Friction Material Underlayer Distribution
2006SAE J2724-2006 Measurement of Disc Brake Friction Material Underlayer Distribution