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An evaluation of short-term exposures of brake mechanics to asbestos during automotive and truck brake cleaning and machining activities

Journal of Exposure Science & Environmental Epidemiology volume 19, pages 458–474 (2009)Cite this article

Abstract

Historically, the greatest contributions to airborne asbestos concentrations during brake repair work were likely due to specific, short-duration, dust-generating activities. In this paper, the available short-term asbestos air sampling data for mechanics collected during the cleaning and machining of vehicle brakes are evaluated to determine their impact on both short-term and daily exposures. The high degree of variability and lack of transparency for most of the short-term samples limit their use in reconstructing past asbestos exposures for brake mechanics. However, the data are useful in evaluating how reducing short-term, dust-generating activities reduced long-term exposures, especially for auto brake mechanics. Using the short-term dose data for grinding brake linings from these same studies, in combination with existing time-weighted average (TWA) data collected in decades after grinding was commonplace in rebuilding brake shoes, an average 8-h TWA of approximately 0.10 f/cc was estimated for auto brake mechanics that performed arc grinding of linings during automobile brake repair (in the1960s or earlier). In the 1970s and early 1980s, a decline in machining activities led to a decrease in the 8-h TWA to approximately 0.063 f/cc. Improved cleaning methods in the late 1980s further reduced the 8-h TWA for most brake mechanics to about 0.0021 f/cc. It is noteworthy that when compared with the original OSHA excursion level, only 15 of the more than 300 short-term concentrations for brake mechanics measured during the 1970s and 1980s possibly exceeded the standard. Considering exposure duration, none of the short-term exposures were above the current OSHA excursion level.

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Acknowledgements

The collection of data used in study was supported in part by funding from Daimler Chrysler, Ford Motor Company, and General Motors Corporation, who have been and are involved in litigation related to the exposure of mechanics to brake dust. However, the authors were not compensated for preparation of this manuscript. Two of the authors, Drs. Finley and Paustenbach, have served as expert witnesses in litigation regarding the potential health hazards to mechanics historically involved in brake repair.

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Authors and Affiliations

  1. Exponent, Irvine, California, USA

    Richard O Richter

  2. ChemRisk, Santa Rosa, California, USA

    Brent L Finley

  3. ChemRisk, San Francisco, California, USA

    Dennis J Paustenbach

  4. ChemRisk, Boulder, Colorado, USA

    Pamela R D Williams

  5. Exponent, Oakland, California, USA

    Patrick J Sheehan

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  1. Richard O Richter
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  2. Brent L Finley
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  3. Dennis J Paustenbach
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  4. Pamela R D Williams
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  5. Patrick J Sheehan
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Correspondence to Richard O Richter.

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Richter, R., Finley, B., Paustenbach, D. et al. An evaluation of short-term exposures of brake mechanics to asbestos during automotive and truck brake cleaning and machining activities. J Expo Sci Environ Epidemiol 19, 458–474 (2009). https://doi.org/10.1038/jes.2008.36

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