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Brake and Clutch Emissions Generated During Vehicle Operation
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English
Abstract
In order to define the extent of gas and particulate emissions from automotive brakes (and clutches), a combination separation and storage collection system was devised. Unique emissions collectors for both disc and drum brakes and for a clutch were conceived, designed, and built as the main embodiment of this instrumentation. The hardware was installed on a vehicle which was then driven through various test cycles to determine the extent and type of brake emissions generated at low- and high-operating temperatures. Typical driving conditions such as the Detroit Traffic Test as well as more abusive driving conditions such as fade tests were included.
Typical original equipment and aftermarket friction materials for both disc and drum brakes were used in the tests. Brake relines were made to simulate typical consumer-type practices. The brake emissions generated were removed from the various collectors and mass balances were performed. The particulates were processed and analyzed by a combination of optical and electron microscopy to ascertain the asbestos content and the asbestos particle size distribution in the wear debris. Comparisons of emissions from new and used friction materials, from disc and drum brakes, and from original equipment and aftermarket materials were made. Finally, an estimate was made of the total emission of asbestos by all of the vehicles in the country. On the average more than 99.7% of the asbestos is converted. The contribution to the atmosphere is 5060 lb or 3.2% of the total asbestos emission.
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Citation
Jacko, M., DuCharme, R., and Somers, J., "Brake and Clutch Emissions Generated During Vehicle Operation," SAE Technical Paper 730548, 1973, https://doi.org/10.4271/730548.Also In
References
- Hodgson A. A. “Fibrous Silicates.” Lecture Series No. 4 Royal Institute of Chemistry London 1965
- Yada K. “Study of Chrysotile Asbestos by a High Resolution Microscope.” Acta Chrystallegraphica 23 1967 704
- Bayer S. G. Brown T. A. Zumwalde R. D. “Equipment and Procedures for Mounting Millipore Filters and Counting Asbestos Fibers by Phase Contrast Microscopy.” H.E.W. Public Health Service February 1969
- Heffelfinger R. E. Melton C. W. Henry W. M. “Development of a Rapid Survey Method of Sampling and Analysis for Asbestos in Ambient Air.” Interim Report to National Center for Air Pollution Control July 1970
- Nicholson W. J. Rohl A. N. Ferrand E. F. “Air Pollution in New York City.” Presented to Second International Air Pollution Conference Washington, D. C. December 1970
- Murchio J. 1971
- Leineweber J. P. September 1972
- National Highway Traffic Safety and Federal Highway Administration estimates Jan. 18 1973
- Polk R. L. Jan. 12 1973
- January 1973
- January 1973
- Harwood C. F. “Asbestos Air Pollution Resulting From the Wear of Braking Linings.” Illinois Institute of Technology Research Institute April 1972
- May T. C. Lewis R. W. “Mineral Facts and Problems: ‘Asbestos.’” U. S. Bureau of Mines Bulletin 650 1970
- January 1973
- Spiel S. Johns-Manville Research and Engineering 1971
- Lynch J. “Brake Lining Decomposition Products.” J. Air Poll. Control Assoc. 18 1968 12 824