This SAE Standard covers motor vehicle brake fluids of the nonpetroleum type, based upon glycols, glycolethers and appropriate inhibitors, for use in the braking system of any motor vehicle such as a passenger car, truck, bus, or trailer. These fluids are not intended for use under arctic conditions. These fluids are designed for use in braking systems fitted with rubber cups and seals made from styrene-butadiene rubber (SBR), or a terpolymer of ethylene, propylene, and a diene (EPDM).
Document revision was considered necessary to harmonize SAE J1703 and the SAE J1704 specification.
Appendix C is further expanded to include information on the Rubber Test Cups (RM-3a) in Section C.4, for their preparation, handling, and storage, and Figure C1, for their design dimensions for the rubber cups.
Specification requirements are made clearer and easier to find using a tabulated format.
Greater specification detail is given for the referee materials used in the test methods and issued in a separate document to make future document revisions simpler.
The stroking test has been withdrawn as it no longer reflects current technology. However, it is considered important that this draft include archival information on the test and its’ characteristics, should the test be redesigned for modern and future technologies. See Appendix G.