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Like I said before, the holes evacuate the dust that would otherwise build up inside the drum. We are all familiar with how dirty drum brakes are when you open them up. I will get some pictures next time I open them up to see how they are doing. I will be checking on the fronts very soon to see how they are doing. I can't see anything without taking them apart because of the shields. I may just remove them.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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