SAE J840-2017 PDF

Scope: 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. Purpose The purpose of this test is to quantify the load required to cause a shear failure at the interface of the friction material and backing plate or brake shoe. The test also provides a qualification of the failure mode on the assembly at the different layers or components. Test parts can be of different types and in different conditions: new or used from vehicle or inertia-dynamometer test@ prototype or production@ complete assemblies or segments@ and with or without special treatment like thermal@ environmental or corrosion exposure.

SAE J840-2017 history

2017 SAE J840-2017 Test Procedures for Brake Shoe and Lining Adhesives and Bonds@ Recommended Practice (August 1982)
2007 SAE J840-2007 Test Procedures for Shear Strength of Automotive Brake Pads and Brank Lining Assemblies
1998 SAE J840-1998 Test Procedures for Brake Shoe and Lining Bonds
1982 SAE J840-1982 Test Procedures for Brake Shoe and Lining Adhesives and Bonds@ Recommended Practice (August 1982)
1971 SAE J840C-1971 TEST PROCEDURES FOR BRAKE SHOE AND LINING ADHESIVES AND BONDS
1968 SAE J840B-1968 TEST PROCEDURES FOR BRAKE SHOE AND LINING ADHESIVES AND BONDS
1962 SAE J840-1962 TEST PROCEDURES FOR BRAKE SHOE AND LINING ADHESIVES AND BONDS