The potential human health hazard of asbestos (1332214) exposure during servicing of brake and clutch assemblies for motor vehicles was discussed. Pertinent references, estimates of the population at risk, the NIOSH interim recommendation for brake and clutch servicing procedures, and a copy of the Department of Labor standard covering exposure to asbestos in the work place were provided. A study had indicated that workers engaged in the maintenance and repair of automobile and truck brake linings may be exposed to potentially hazardous levels of airborne asbestos dust. Activities associated with high levels of airborne asbestos included blow out of automobile drum brake assemblies, grinding of used truck brake linings, and bevelling of new truck brake linings. Personal samples for the three activities showed average peak asbestos air concentrations of 10.5, 3.75, and 37.3 fibers/milliliter, respectively. Most of the asbestos fibers were less than 0.4 microns in length. Although the extent of asbestos related disease in brake servicing personnel had not been studied systematically, a review of the literature revealed four cases of mesothelial tumors in workers involved in automobile brake servicing. Based on census information, it was estimated that 907,871 workers were potentially exposed to asbestos during manufacture and servicing of brake linings and clutches, including 833,535 auto mechanics and 67,679 garage workers.