NEIEP Machine Room Maintenance (550) Practice Test

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The large amount of current used to achieve full brake pick is needed to overcome the _______ forces of the brake _______.

mechanical, spring electrical, field thermal, expansion magnetic, core

Correct Answer:

mechanical, spring

Explanation:

In many electric braking systems, the brake is spring-applied and magnetically released. The braking torque is created by mechanical springs that push the brake shoes or pads onto the rotor or drum. To fully release the brake (or “pick” it) you must apply enough current to counteract those spring forces. The more robust the springs, the more current you need to overcome them and achieve full release, i.e., full brake pick. Other potential forces like electrical field, thermal expansion, or core magnetism aren’t what mainly oppose the release in this setup. The essential resisting force that must be overcome to release the brake is the mechanical force from the springs.

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