I would say you have a broken brake shoe return spring inside or a leaky seal allowing the brake shoes and drum to become coated with gear oil which can cause this also. The parts become sticky once soaked in oil and become heated. Most drum brakes are self energizing once they are applied. Meaning that once the shoe touches the drum it is drawn into the drum just by the drum's rotation. That's why the cars/trucks with drum brakes had better braking power in forward direction than in reverse. On cars & trucks one shoe has longer lining on it than the other which causes this self energization. They have to be put in the right location though so make sure to look at and measure the shoes before you remove them so you can put them back they way they came off.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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