My brake pedal slowly goes down.  Sitting at a stop recently on a slight slope, I noticed that I'd started rolling backwards without consciously letting the brake pedal ease.  I began paying closer attention and I find that when I put moderate pressure on the brake pedal, it stops me, holds fine, but it goes towards the floor slowly.  Give it a pump and it comes back to the top.  Nothing radical, but something isn't exactly right.  Is that a master cylinder problem or perhaps a wheel cylinder?
  I have new friction material all around and one wheel cylinder replaced at the rear about a month ago when I did the shoes and drums.  No leakage that I can see with the wheels on or inside under the column and pedals.
  84 van, standard trans, 5sp
anybody?
  Don Hanson

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