It depends on what you are trying to determine. If you only want to know what size drums are on the vehicle, you should be able to determine that by measuring the drum diameter roughly from outside, across the center, or widest point. I believe, but don't remember for sure, that these vehicles came with either/or 9 or 10 inch drums on them, depending on the brake system installed. However, if you're trying to find out if they are still usuable, i.e. you hear grinding, or think you have damage, you must remove them, then measure the inside diameter with a brake drum micrometer, or any large inside diameter micrometer. The discard, or max diameter spec is stamped on the drum.
If the brake shoes measure less than 4/32nds thickness, if cracking or warping is observed on the brake drums, if the brake shoes and/or drums become coated in oil (as is what happens when a wheel seal goes bad), or if you hear escaping from the brake chambers when the brakes are released, then you know at least one component in the brake system is bad.
I diagnose the brake system starting with inspecting the master cylinder and the level of brake fluid in the reservoir, then if safe to do so, a road test, then I remove all four wheels, calipers, drums, brake pads, measure the rotors/brake drums and do an inspection of each brake assembly on each wheel including the brake lines and brake hoses. Then make a list of parts needed to bring the brakes up to specs.
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