What you have described is a symptom of a brake master cylinder that has
bad internal seals.  The leakage is internal but the MC has to be
rebuilt or replaced.  Replaced is better.

Mike

William Landsman wrote:
> Hello,
>
>
>
> What does it mean when you are stopped, lets say a light and your brake
> pedal starts to slowly lose resistance and starts to move toward the floor
> of the van.  When I take my foot of the break and reapply it the resistance
> is back and then it starts again.
>
>
>
> Thanks in advance for any advice.
>