Lesson 1/Learning Event 1
FIGURE 5. BRAKE DRUM CONSTRUCTION.
The brake drums are usually made of pressed steel, cast iron, or a
combination of the two metals. Castiron drums dissipate the heat
produced by friction more rapidly than steel drums and have better
friction surfaces. However, if a castiron drum is made as strong as
it should be, it will be much heavier than a steel drum.