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Explain What Preemption Means, and Identify Recent Trends in Its

question 43

Essay

Explain what preemption means, and identify recent trends in its use and the issues that have been addressed.


Definitions:

Wheel Cylinder

An output cylinder in a drum brake assembly. The wheel cylinder contains pistons that move the brake shoes against the drum when the brakes are applied.

Drum Micrometer

A precision measuring tool used to accurately measure the inside diameter of brake drums.

Drum Diameter

The inside diameter of a brake drum, which can affect the brake assembly's efficiency and the vehicle's braking performance.

Drum's Friction Surface

The area on a brake drum where the brake shoes make contact, creating friction to slow down or stop the vehicle.

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