4-111. REAR BRAKE INSPECTION.
This task covers:
TM or Para
Tool kit, general mechanic's: automotive
Brake drum removed.
(1) Inspect wheel cylinder (1) and backing plate
(2) for evidence of leakage. Replace/repair
wheel cylinder or brake lines if required.
Parts of the brake assembly may be coated
with asbestos dust; breathing this dust can
Use a filter mask approved for use
against asbestos dust.
Never use compressed air or dry brush
to clean these assemblies.
Use an industrial type vacuum cleaner
with a high-efficiency filter system to
Use water and a soft bristle brush or
cloth to remove dirt or mud.
Do not allow grease or oil to contact
brake linings. Linings can absorb
grease and oil, causing early glazing
and very poor braking action. Failure
to do so could cause serious injury or
death to personnel.
(2) Inspect brake linings (3) for glazing.
Replace or repair brake shoes if required.
(3) Measure thickness of brake linings (3). If
brake linings are less than 1/8 inch (3 mm)
thick at thinnest point, replace/repair brake