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A New Engineering Approach for Converting Vehicle Brake System to Silicone Brake Fluid
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Abstract
Brake Fluid, Silicone (BFS, MIL-B-46176), which was developed by the U.S. Army Belvoir Research, Development and Engineering Center (BRDEC) in conjunction with industry, was approved in 1980 for retrofit of all U.S. Army vehicles. The approved method for conversion was a flush-and-fill procedure. This method, however, will leave residual polyglycol fluid in brake systems due to the following interdependent reasons: (a) The geometry of the wheel cylinders (bleeders at the top), (b) the immiscibility of the two fluids, and (c) the lower density of the silicone.
A project in this Laboratory resulted in the development of a method which is effective in the complete removal of all polyglycol fluid. The method involves the use of an intermediate fluid (2-ethylhexanol, 2-EH) whose properties are such that a reversal of the phases is induced. This method is thus based on the existence of an isopycnic tie line in the phase diagram of the binary phase system. This phase diagram shows a high phase boundary.
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Authors
Citation
Chapin, C., Conley, J., and Jamison, R., "A New Engineering Approach for Converting Vehicle Brake System to Silicone Brake Fluid," SAE Technical Paper 860633, 1986, https://doi.org/10.4271/860633.Also In
References
- Federal Specification VV-B-680 July 20 1972 Military Specification MIL-H-13910 February 3 1967 Military Specification MIL-P-46046 Automotive Brake System and Components August 26 1964
- Conley J.H. Jamison R.G. “Army Experience With Silicone Brake Fluid.” S.A.E. Technical Paper Series No. 780660 1978
- Military Specification MIL-B-46176 March 27 1978
- Conley J.H. Jamison R.G. Jordan C. “Silicone Brake Fluids: Two-Year Field Test.” MERADCOM Report No. 2164 Jan 1976
- “Brake Fluid. Silicone (BFS) Conversion Procedures for Tank-Automotive Equipment.” DA Technical Bulletin May 1981
- “Evaluation of Flush/Fill Procedures for Silicone Brake Fluid Retrofit.” MERADCOM Letter Report, DRDME-GL October 6 1980
- Francis A.W, Ind. Eng. Chem. 45 2789 1953
- Smith A.L. “Analysis of Silicones.” New York Wiley Chemical Analysis Series of Monographs 41 1974
- Francis A.W. “Liquid-Liquid Equilibriums.” New York Interscience Publishers 3 1963