Thirty-six technicians employed in five, medium-sized,
independent vehicle repair facilities and five large dealerships
were observed during one to five randomly selected workdays.
All 10 facilities used aerosol brake cleaning products of various
types. A subset of nine technicians employed at three of
the medium-sized shops participated in quantitative exposure
measurements (Table I). These shops (Shops A, B, and C) were
selected because their workers, owners, and managers agreed
to participate in the assessment and because each shop used
Product #1.