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Friction Coefficient Identification and Environmental Marking System for Brake Linings

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J866_201903
  • Current
Published 2019-03-11 by SAE International in United States
This SAE Recommended Practice is intended to provide a uniform means of identification which may be used to classify the friction coefficient of brake linings, based on data obtained from tests conducted in accordance with SAE J661 Brake Lining Quality Test Procedure and SAE J2975 Measurement of Copper and other elements in Brake Friction Materials. NOTE: It is emphasized that this document does not establish friction requirements for brake linings, nor does it designate significant characteristics of brake linings which must be considered in overall brake performance. Due to other factors that include brake system design and operating environment, the friction codes obtained from this document cannot reliably be used to predict brake system performance.
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High-Preload Deflection and Compressibility Test Procedures for Friction Materials

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J2468_201811
  • Current
Published 2018-11-12 by SAE International in United States
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.
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Test Procedures for Shear Strength of Automotive Brake Pads and Brake Lining Assemblies

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J840_201711
  • Current
Published 2017-11-15 by SAE International in United States
This SAE Recommended Practice covers equipment capabilities and the test procedure to quantify and qualify the shear strength between the friction material and backing plate or brake shoe for automotive applications. This SAE Recommended Practice is applicable to: bonded drum brake linings; integrally molded disc brake pads; disc brake pads and backing plate assemblies using mechanical retention systems (MRS); coupons from drum brake shoes or disc brake pad assemblies. The test and its results are also useful for short, semi-quantitative verification of the bonding and molding process. This Recommended Practice is applicable during product and process development, product verification and quality control. This Recommended Practice does not replicate or predict actual vehicle performance or part durability.
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Road Vehicles - Friction Materials - Elastic Properties Measurements

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J2725_201709
  • Current
Published 2017-09-29 by SAE International in United States
This SAE Standard specifies a method for testing and measuring elastic constants in friction materials by precise ultrasonic velocity measurements. Measurement methods are also described for measurement of the out-of-plane modulus as a function of pre-load as well as the measurement of engineering constants as a function of temperature. Finally, methods are formulated to produce all engineering constants as a function of pre-load and temperature.
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Specific Gravity of Friction Material

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J380_201702
  • Current
Published 2017-02-02 by SAE International in United States
Specific gravity is a nondestructive test used as a quality control check of the consistency of formulation and processing of brake lining. The specific gravity and the range of specific gravity are peculiar to each formulation and, therefore, the acceptable values or range must be established for each formulation by the manufacturer. Specific gravity alone shows nothing about a materials in use performance. The specific gravity of sintered metal powder friction materials, particularly those which have steel backing members, is usually determined somewhat differently. Reference ASTM B 376.
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Gogan Hardness of Brake Lining

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J379_201702
  • Current
Published 2017-02-02 by SAE International in United States
Hardness measurements are used as a quality control check of the consistency of formulation and processing of brake linings. Gogan hardness is nondestructive (the penetrator causes shallow surface deformation.). Gogan hardness method alone does not show anything about a lining’s ability to develop friction or to resist fade when used as a friction element in brakes. The hardness and the range of hardness are peculiar to each formulation, thickness, and contour; therefore, the acceptable values and ranges must be established for each formulation and part configuration by the manufacturer.
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Thermal Transport Properties Germane to Friction Materials and Brakes

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J2581_201702
  • Current
Published 2017-02-02 by SAE International in United States
This SAE Information report defines the thermal transport properties important in the assessment of heat management capability of brake lining, shoe, disc and drum materials. The report discusses thermal diffusivity, specific heat capacity, thermal conductivity and thermal expansion. Measurement techniques for the appropriate ASTM standards are identified. The thermal transport properties discussed are material sample properties, not the properties of entire components such as pad assemblies.
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Low-preload Deflection Measurement for Brake Pads, Noise Shims, and Brake Pad Assemblies

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J3079/2_201607
  • Current
Published 2016-07-14 by SAE International in United States
This SAE Standard specifies a method for measuring the deflection of friction materials, noise insulators, and disc brake pad assemblies to be used in road vehicles with a Gross Vehicle Weight Rating below 4336 kg. This part of the SAE J3079 includes the test for deflection and creep at various pressures under ambient temperature conditions. This SAE test method differs from SAE J2468 and ISO 6310 in the preload and maximum load applied to the test sample when deflection is measured. It also introduces additional measurements such as for deflection offset, hysteresis, and creep.
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Measurement of Disc Brake Friction Material Underlayer Distribution

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J2724_201605
  • Current
Published 2016-05-24 by SAE International in United States
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 distribution is useful for computing useable lining thickness and for friction material quality management.
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Hardness of Brake Lining

Brake Linings Standards Committee
  • Ground Vehicle Standard
  • J2654_201508
  • Current
Published 2015-08-27 by SAE International in United States
Hardness measurements are used as a quality control check of the consistency of formulation and processing of brake linings. This hardness method is nondestructive. NOTE—This method is not a measure of friction level. The hardness and the range of hardness are characteristic of each formulation; therefore, the acceptable values and ranges must be established for each formulation and may be affected by processing. NOTE—The hardness of sintered powder metal lining is usually determined with Rockwell superficial hardness equipment. (See ASTM B 347)
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