SAE J840 MAR2026 is a stabilized SAE Recommended Practice covering equipment capabilities, sample preparation, fixtures, and destructive shear test procedures for bonded drum brake linings, integrally molded disc brake pads, mechanically retained disc brake pad assemblies, and test coupons.
The document provides ambient, hot, and temperature-degradation shear test procedures; requirements for normal and shear loading; shear failure assessment methods; test report requirements; and appendices for cotton tack, adhesive state-of-cure, and friction material retention analysis. It is intended for product and process development, product verification, and quality control. The practice does not replicate or predict actual vehicle performance or part durability.
Application Scope: Automotive brake pad and brake lining development, manufacturing process control, product verification, quality control, adhesive bonding evaluation, and friction material retention assessment.
