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One of the key benefits of drum brakes is their enhanced heat dissipation capabilities. The enclosed design allows for a larger surface area to dissipate heat generated during braking, making them particularly effective in applications where braking is frequent and intense. This characteristic is especially useful during the landing phase, where an aircraft must rapidly decelerate from high speeds.
aircraft drum brakes

Using the caliper or micrometer, measure the inner diameter of the brake drum. If the drum displays a lip or ridge from wear, ensure your measurement captures the least-worn area. A typical brake drum has a specified maximum permissible diameter, which can be found in the vehicle’s service manual. This measurement is critical; if the drum exceeds its maximum diameter due to wear, it may need to be replaced.
how to measure a drum brake
