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TM 9-2330-326 -14&P
Asbestos and Non-Asbestos Fibers
The following procedures for servicing brakes are
3. Procedures for Servicing Brakes.
recommended to reduce exposure to asbestos ?ber dust,
a. Enclose the brake assembly within a negative pressure enclosure.
a cancer and lung disease hazard. Material Safety Data
The enclosure should be equipped with a HEPA vacuum and
Sheets are available from ArvinMeritor.
worker arm sleeves. With the enclosure in place, use the HEPA
vacuum to loosen and vacuum residue from the brake parts.
Hazard Summary
b. As an alternative procedure, use a catch basin with water and a
Because some brake linings contain asbestos, workers who service
biodegradable, non-phosphate, water-based detergent to wash the
brakes must understand the potential hazards of asbestos and
brake drum or rotor and other brake parts. The solution should be
precautions for reducing risks. Exposure to airborne asbestos dust can
applied with low pressure to prevent dust from becoming airborne.
cause serious and possibly fatal diseases, including asbestosis (a chronic
Allow the solution to ?ow between the brake drum and the brake
lung disease) and cancer, principally lung cancer and mesothelioma (a
support or the brake rotor and caliper. The wheel hub and brake
cancer of the lining of the chest or abdominal cavities). Some studies
assembly components should be thoroughly wetted to suppress
show that the risk of lung cancer among persons who smoke and who are
dust before the brake shoes or brake pads are removed. Wipe the
exposed to asbestos is much greater than the risk for non-smokers.
brake parts clean with a cloth.
Symptoms of these diseases may not become apparent for 15, 20 or
more years after the ?rst exposure to asbestos.
c. If an enclosed vacuum system or brake washing equipment is not
available, employers may adopt their own written procedures for
servicing brakes, provided that the exposure levels associated with
Accordingly, workers must use caution to avoid creating and breathing
the employer's procedures do not e ceed the levels associated
dust when servicing brakes. Speci?c recommended work practices for
with the enclosed vacuum system or brake washing equipment.
reducing exposure to asbestos dust follow. Consult your employer for
Consult OSHA regulations for more details.
more details.
Recommended Work Practices
d. Wear a respirator equipped with a HEPA ?lter approved by NIOSH
or MSHA for use with asbestos when grinding or machining brake
1. Separate Work Areas. Whenever feasible, service brakes in a separate
linings. In addition, do such work in an area with a local exhaust
area away from other operations to reduce risks to unprotected
ventilation system equipped with a HEPA ?lter.
persons. OSHA has set a maximum allowable level of exposure for
asbestos of 0.1 f/cc as an 8-hour time-weighted average and 1.0 f/cc
e. NEVER use compressed air by itself, dry brus hing, or a vacuum
averaged over a 30-minute period. Scientists disagree, however, to
not equipped with a HEPA ?lter when cleaning brake parts or
what extent adherence to the maximum allowable exposure levels will
assemblies. NEVER  use carcinogenic solvents, ?ammable
eliminate the risk of disease that can result from inhaling asbestos
solvents, or solvents that can damage brake components as
dust. OSHA requires that the following sign be posted at the entrance
wetting agents.
to areas where exposures exceed either of the maximum allowable
Cleaning Work Areas. Clean work areas with a vacuum equipped with
a HEPA ?lter or by wet wiping. NEVER use compressed air or dry
sweeping to clean work areas. When you empty vacuum cleaners
and handle used rags, wear a respirator equipped with a HEPA ?lter
approved by NIOSH or MSHA for use with asbestos. When you
replace a HEPA ?lter, wet the ?lter with a ?ne mist of water and
dispose of the used ?lter with care.
Worker Clean-Up. After servicing brakes, wash your hands before
you eat, drink or smoke. Shower after work. Do not wear work clothes
home. Use a vacuum equipped with a HEPA ?lter to vacuum work
clothes after they are worn. Launder them separately. Do not shake
or use compressed air to remove dust from work clothes.
2. Respiratory Protection. Wear a respirator equipped with a high-
Waste Disposal. Dispose of discarded linings, used rags, cloths and
ef?ciency (HEPA) ?lter approved by NIOSH or MSHA for use with
HEPA ?lters with care, such as in sealed plastic bags. Consult
asbestos at all times when servicing brakes, beginning with the
applicable EPA, state and local regulations on waste disposal.
removal of the wheels.
Regulatory Guidance
References to OSHA, NIOSH, MSHA, and EPA, which are regulatory agencies in the United States, are made to
provide further guidance to employers and workers employed within the United States. Employers and workers
employed outside of the United States should consult the regulations that apply to them for further guidance.


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