SAE J2707_202106

This SAE Recommended Practice (RP) specifies a dynamometer test procedure to characterize wear rates of automotive service brake linings (brake shoes) and disc brake pads. This revision of the wear test procedure includes several changes to: (a) harmonize with other SAE Recommeded Practices (RPs), (b) modernize and expand the test sequences, and (c) address typographical and editorial corrections from previous versions. Some specific updates include the following: Harmonization with SAE J2789 for inertia calculation and with SAE J2986 for wear measurements. Expansion of the wear versus temperature (Method A) includes temperatures below 100 °C for friction materials with ferrous metals and decelerations below 0.3 g. These updates reflect normal customer usage and field measurements using the worldwide harmonized light vehicle test procedure (WLTP) adapted for a brake duty cycle. Extension of the block wear test (Method B) with separate temperatures for front and rear brakes and lower energy levels. Common burnish schedule for all test methods to ensure consistent conditioning in preparation for the actual wear test. The new burnish method harmonizes with the FMVSS 135 burnish, common in other inertia dynamometer tests.