Not to worry
First get a test vacuum gage and check engine vacuum. If the valves are seating nicely, the gage should show about 21 inches. Brake fluid is supposed to be changed at least once in three years. Remove the m-cylinder cap and insert a finger to check for sludge or lumps or water. Water is a hydraulic brake system's worst enemy. Go the each cylinder and remove each bleeder valve. Use a bench motor wire wheel and clean each carefully. Put anti seize compound all over the bleeder and inside bleeder hole at wheel cylinder. If possible use a vacuum type bleeder to remove all the old fluid. If the fluid is clear, all is good. Fill the m-cylinder and allow fluid to slowly leak out at each location. After the is some evidence of fluid at each wheel, tighten the bleeders, and add fluid to to top of the m-cylinder. Now carefully bleed the cylinders using the foot pedal. The effort will be hard to push but the brake action will operate the same with engine running or not. Observe the fluid level constantly. After a good squirt of fluid is in evidence, time now to adjust all the brake shoes. Tighten the adjuster till the wheel drags a bit then reverse the adjuster to free the wheels. OK, now start the engine and notice brake operation..... Frank
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