High-Preload Deflection and Compressibility Test Procedures for Friction Materials
This standard specifies a method for testing and measuring the deflection of friction materials assemblies and compressibility of friction materials. This standard applies to disc brake pad assemblies and its coupons or segments, brake shoe lining and its coupons or segments, and brake blocks segments used in road vehicles. This SAE test method is consistent in intent with the ISO 6310 and the JIS 4413.
The compressive response of a brake lining is an important design parameter when evaluating brake fluid volume consumption, brake pedal travel, or the propensity of a brake system to generate roughness (low-frequency vibration) or noise. Brake lining compressibility is also useful for lining characterization and quality control as part of the product specification and as part of regulatory requirements for certain markets. The purpose of this series of test procedures is to evaluate the compressibility of disc and drum brake friction materials and its assemblies.
This revision includes the following changes:
Integration with the SAE J3079 series of recommended practices for deflection and compressibility measurements.
Harmonization of sample types with other international standards.
Improved layout to facilitate the execution of specific methods for different types of friction materials.
The SAE J3079 series of recommended practices include:
Part 1 – Validation of Compressibility Test Systems for Brake Friction Materials
Part 2 – Low-Preload Deflection Measurement for Brake Pads, Noise Shims, and Brake Pad Assemblies
Also known as: SAE J 2468
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