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3 3 >rne dust wed that ompared hat there use as a ther they .ng dynafrom bus instance, lum temic binder rting temc remains ining and tos. The i different per, com>rsterite, a ake drum an amorime about .idence to ot be dis- u Exposure to asbestos during brake maintenance 21 introduction of "flow-line" servicing at Dealers works, in which one individual may be engaged almost entirely on brake servicing, emphasises this point. Our environmental studies have not included maintenance procedures which in volve the filing or grinding of brake lining material, and we would envisage that these would give rise to considerably increased air contamination by chrysotile asbestos, with the attendant need for strict precautions to prevent the inhalation of fibres. REFERENCES Committee on Hygiene Standards, British Occupational Hygiene Society (1968) Hygiene Standards for Chrysotile Asbestos Dust, Pergamon Press, Oxford. Holmes, S. (1967) Private communication. Lynch, J. R. (1968) J. Air Pollut. Control Ass. 18,824. itenance is e personal xposure. cleaning to procedures awards the a m