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Alpine Testing of Silicone Brake Fluids
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English
Abstract
Mountain descents are widely used for brake testing in both the United States and Europe. In order to demonstrate the high temperature capability of silicone-based brake fluids mountain descents, preceded by extensive track testing, were carried out at the Stilfser Joch in northern Italy and the Gross-glockner in south central Austria.
A Volkswagen Rabbit was used as the test vehicle since its size, weight, engine displacement, and brake system configuration are typical of current and future vehicles.
All test requirements were met with ease. The limiting factor was found to be compressibility of the silicone fluid and the ratio of master cylinder displacement to caliper and wheel cylinder volume. The effects of compressibility, although measurable in some braking systems, were found to be significant only at temperatures where a conventional fluid in normal use would vapor lock.
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Authors
Citation
Holbrook, G., "Alpine Testing of Silicone Brake Fluids," SAE Technical Paper 810803, 1981, https://doi.org/10.4271/810803.Also In
References
- Burgess I. “Brake Fluid Temperatures Obtained in Alpine Vehicle Trials.” Sae Publication 740126 February 1974
- Data presented to the SAE Motor Vehicle Brake Fluid Subcommittee Olin Corporiation and Burmah-Castrol, Inc
- Radlinski R. W. Forthofer R. J. Harvey J. L. “Operating Performance of Motor Vehicle Braking Systems as Affected by Fluid Water Content.” SAE Publication 710253 January 1971
- Harvey J. L. Milliken L. T. Forthofer R. J. “Trends In Motor Vehicle Brake Fluids and Their Standards.” SAE Publication 710251 January 1971
- “Safety Systems Laboratory Participation in SAE Research Project R-ll - Field Evaluation of Brake Fluid Moisture Pickup on Vehicles.” DOT HS-800 960. NHTSA Technical Report November 1973
- Conley J. H. “Silicone Brake Fluids: Two Year Field Test.” MERADCOM Report AD 2164, AD/A-026 180 January 1976