Lesson 1/Learning Event 1
EXTERNAL-CONTRACTING AND INTERNAL-EXPANDING BRAKES
FIGURE 4. EXTERNALCONTRACTING AND INTERNALEXPANDING BRAKES.
There are several types of braking systems. All systems require the
use of a rotating (turning) unit and a nonrotating unit. Each of
these units contains braking surfaces that, when rubbed together,
give the braking action. The rotating unit on military wheeled
vehicle brakes consists of a drum secured to the wheel. The
nonrotating unit consists of brake shoes and the linkage needed to
apply the shoes to the drum. Brakes are either the external
contracting or internalexpanding type, depending on how the
nonrotating braking surface is forced against the rotating braking
surface.
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