Figure 6-2.-Drum wear patterns.
Figure 6-3.-Using a drum micrometer to measure the drum.
CESO Maintenance Bulletin No. 75 directs
the Naval Construction Force to use silicone
brake fluid. Silicone brake fluid will not mix
with glycol brake fluid and no adverse effects
will occur to brake parts if it is combined
accidently in small quantities. Some of the
advantages of silicone brake fluid are that it will
not damage painted surfaces, it has excellent
dielectric properties, it will not deteriorate
during long periods of system storage or
climatic exposure, and it will not absorb or
To comply with requirements for testing brakes, you
must see that at least one of the wheels is removed to
check the brake lining and drum/rotor. Some
Figure 6-4.-Examples of specifications cast into brake drums.