If you can easly spin the wheels and you just hear a little friction the shoes are still to far from the drums. I've always adjusted mine to where it takes arm power to turn the wheel...as soon as you stop pushing the wheel it stops turning, no free-wheeling.
After each adjustment and with the wheel still off the ground push on the brake pedal a couple times to "center" the shoes and check that wheel again. Keep doing that until there is no change in the arm power it takes to spin the wheel. It could take a couple adjustments to get it right. As you move to the other wheels you should feel the pedal getting better.
To test the Hydrovac, put moderate pressure on the brake pedal and start the engine...you should feel the pedal fade away a little as the engine developes vacuum.
Also, rubber brake lines will look new on the outside and be trash on the inside, they swell up restricting flow. I'd replace them if they are 20 years old
Mike B
