Document 3exmg8Z0LQv5kjKDdw3Kdpn26
FILE NAME Brakes BRK DATE 1976 July 8
DOC BRK259
DOCUMENT DESCRIPTION Memo RE Asbestos Exposure Associated With Automotive Brake Systems
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INTERNAL
CORRESPOND
M
PLASS
-, Mr. A. R. Clark
a
. Mr. J. H. Lloyd
Dr. R. J. Sexton Mr. F. Williams
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July 8 1976
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Asbestos Exposure Associated With Automotive Brake Systems
esbestos
Fibers
exposure
rade The spirit of cooperation
while wearing personnel samplers
maintenance
Discussion Discussion of each
as follows
brake
on the
during
of the
Department
Measurements of personnel
repair
job tasks have been
part of Mr. L. M. Hoffman was commendable
three types of job tasks involving brake
job performances together with results results results 15
TIPS The right rear wheel of a pickup truck was removed for inspection 1. was
determined that new brake shoes were required and the mechanic proceeded to vacuum
the
not
0.4
brake drum
apparent Libers per
and replace the shoes He did not
wear a respirator
sampling time Tire involved 24 minutes as TLV il of air with the threshold
limit
valve
Asbestos
being
as a need was fiber count was two fibers
greater than five microacters in length
SECOND
The left rear wheel was removed for inspection and the need for replacement
was apparent At our request the mechanic wore a 3 respirator and used compressed
air to clean the brake drum before changing the brake shoes Significant quantities
of fine dust was generated which dispersed throughout the shop Elapsed time
time
ao nd r ssaarrplpilnging time was
19.5
19.5 miminuntesutes
Asbestos Asbestos
Asbestos
fiber fiber
fiber
count
count
count
of
of
fibers
fibers
greater five
in length was 0.2 per ml of air There was considerable
micrometers on the sample but less fibers possibly due to air dispersion
greater
dust
than collected
front disc brake was removed
minutes
No air or vacuum
inspected
was used
and replaced curing a
The results were 1.9
likely indicates the greatest exposure potertial associated
service to be the removal and replacement of the wheel for
additional work is not required
This factor is time related
opinion that even at the new fiber LV there is generally
excessive exposure to asbestos in the automotive garage
Use of
recently acquired
respirators should be
vacuum capability should continue to be used on any special occasion where dust
required
levels are
The 3M suspect
being excessive
Mr. Hoffman should be informed of the results of these veasurerents and if Chere are questions please call me at 6161
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UCC 008857