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One standard method for measuring brake drums involves utilizing a brake drum measurement chart, which provides specific dimensions and tolerances relevant to different vehicles. Typically, this chart includes measurements such as the inner diameter of the drum, the total thickness, and necessary tolerances for both new and worn drums. By referencing this chart, technicians can determine if the brake drum is still within acceptable limits or if it requires immediate attention.
brake drum measurement chart

Another notable disadvantage is their performance in wet conditions. When exposed to water, drum brakes can diminish in effectiveness until they dry out, leading to concerns around safety. Furthermore, since they are often housed within a drum, maintenance can be more challenging, potentially leading to neglected issues.
drum and disc brake system
