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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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