2 inch hydraulic cylinder seal


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

Another advantage of aircraft drum brakes is their ability to maintain a consistent performance in varying environmental conditions. They are less susceptible to the effects of debris and water compared to disc brakes, which can lead to reduced performance due to slippage. This robustness makes drum brakes preferable for certain types of aircraft, particularly older models and smaller general aviation planes.