1. Brake frame bolt
4. Expander tube
7. Return spring
5. Brake block
8. Return spring shield
9. Tube shield
Figure 2-30.--Expander tube brake. A. exploded view; B. assembled view; C. cross-sectional view.
Metallic brake linings are made of finely powdered
The frictional qualities of this type of lining are
iron, copper, or graphite, and lesser amounts of
lower because of the smooth surface. However, this
inorganic fillers and friction modifiers. The mixture is
type of lining dissipates heat rapidly and wears longer
put through a molded block process and compressed
than the woven type. As a result, the molded lining is
and baked into the desired form. Metallic brake linings
more suitable for application on the wheel brakes than
are used when extreme braking conditions exist. The
are the woven types. Because of the density of the
frictional characteristics of metallic linings are more
constant that those of organic linings.
molded material, it is less affected by oil and water.