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Simulation of Automobile Brake Wear Dynamics and Estimation of Emissions
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Abstract
Asbestos emissions from automobile brakes were measured under conditions simulating downtown city driving. Reference data for city driving was obtained by measuring vehicle speed, time of brake application, cool-down time between applications, brake hydraulic-line pressure and pad temperature. Data from 1800 braking applications were then analyzed to provide a statistical distribution of representative braking cycles.
We constructed a computer-controlled brake emission test rig that simulated road braking operation of a front wheel disc brake and collected airborne wear debris. Representative braking cycles were programmed on this system to experimentally estimate brake emissions under a variety of braking conditions.
Realistic braking operations produced particle and asbestos emission rates in close agreement with those measured by Williams and Muhlbaier. Asbestos concentration was not correlated with mechanical work done in braking.
Application of the asbestos emission rates to air quality models confirmed Williams and Muhlbaier's finding that about 1% of asbestos fibers in city core districts originated from disc brake wear.
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Citation
Cha, S., Carter, P., and Bradow, R., "Simulation of Automobile Brake Wear Dynamics and Estimation of Emissions," SAE Technical Paper 831036, 1983, https://doi.org/10.4271/831036.Also In
References
- Suta, B.E. Levine, R.J. 1979 Non-Occupational Asbestos Emissions and Exposures Asbestos; Properties, Applications, and Hazards I Michaels, L. Chissick, S.S. 179 New York John Wiley and Sons
- Jacko, M.G. Ducharme, R.T. Somers, J. 1973 Brake and Clutch Emissions Generated During Vehicle Operation. 730548 New York, NY Society of Automotive Engineers
- Muhlbaier, J.L. Williams, R.L. 1980 Characterization of Asbestos Emissions from Brakes GMR-3435 Warren, MI General Motors Research Laboratories
- Williams, R.L. Muhlbaier, J.L. 1980 Contribution of Brake Lining Wear to Urban Airborne Asbestos GMR-3422 Warren, MI General Motors Research Laboratories
- Society of Automotive Engineers 1978 Brake System Road Test Code-Passenger Car and Light Duty Truck-SAE J843d SAE Handbook, Part II 31.69 31.73 Warrendale, PA Society of Automotive Engineers
- Cha, S. Carter, P. 1982 Estimation of Urban Automobile Brake Emissions through Simulation of Wear Dynamics TR-82-08 Research Triangle Park, NC Northrop Services, Inc.
- Preston, J.D. Forthofer, R.J. 1971 Correlation of Vehicle Dynamometer and Other Laboratory Tests for Brake Friction Materials. 71050 New York, NY Society of Automotive Engineers
- Samudra, A.V. Bock, F.C. Harwood, C.F. Stockham, J.D. 1978 Evaluating and Optimizing Electron Microscope Methods for Characterizing Airborne Asbestos EPA 600/2-78-038 Research Triangle Park, NC U.S. Environmental Protection Agency
- Williams, R.L. Muhlbaier, J.L. 1980 Gas and Particulate Emission Rates from Asbestos Linings GMR-3434 Warren, MI General Motors Research Laboratories
- Williams, R.L. 1980 Design and Construction of a Test Facility to Characterize Brake Wear Emissions GMR-3477 Warren, MI General Motors Research Laboratories
- Preston, J.D. 1973 Inertia Dynamometer Evaluation of Brake Lining Materials. 730192 New York, NY Society of Automotive Engineers
- Jacko, M.G. Ducharme, R.T. 1973 Simulation and Characterization of Used Brake Friction Material and Rotors. 730191 New York, NY Society of Automotive Engineers
- Anderson, A.E. Gealer, R.L. McCune, R.L. Sprys, J.W. 1973 Asbestos Emissions from Brake Dynamometer Tests. 730549 New York, NY Society of Automotive Engineers
- Rowson, D.M. 1978 The Chrysotile Content of the Wear Debris of Brake Linings Wear 47 315 321
- Bradow, R.L. 1980 Diesel Particulate Emissions Bull. N.Y. Acad. Med. 56 797 811