Generally if you can pump the pedal and it gets stiffer, ie shorter
stroke, then your brakes are out of adjustment. The following is the
procedure I use when adjusting brakes after having the drum open.
1. Jack up both rear wheels, (assuming the front is disk) and place jack
stands underneath.
2. Starting with either wheel back off the adjusters 100%.
3. Start tightening the adjusters. Pick a wheel and do 3-4 clicks on one
adjuster, then 3-4 clicks on the other. This will help keep them even.
4. Continue doing this until the brakes are so tight the drum will not
move.
5. Move to the other wheel and do the same.
6. Now bleed the brakes.
7. After bleeding one side go back to that wheel and see if the drum
will move. IF it does, tighten it up equally on both adjusters.
8. Continue steps 6 and 7 until a) there are no air bubbles in the line
AND b) the drums stay tight.
9. Now, keeping the number of clicks per adjuter per wheel even, back
them off just enough so that the drum will spin.
10. Clean up, put the tires back on, etc and take it for a spin.

My understanding for why this works is that the brake shoes have a
ceartin spot they like to sit in the drum, and until you get them there
they just keep wiggling around looking for it. I came upon this method
while working on my old super beetle  after I spent 2 months, pumped 5
quarts of brake fluid, and even took it to a professional brake shop
trying to fix this problem. An older gentlemen in OK who has a personal
junk yard explained this to me.

YMMV Good luck!
--
Chip Shaner
4 kids and 1 cookin'.......
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