[hcoles]

I submerged mine and started pumping the piston up and down with a big set of channel locks. At first the bleed opening at the top of the piston bubbles out air after compressing the piston...you may have to wait for a few seconds and the pressure of the air should be pretty high. This assumes you have some oil on the piston so that air doesn't just come up the sides. If this doesn't happen my guess is that the check valve at the bottom of the piston is not holding. I would try shooting some brake cleaner in there and see if you can clear out some debris. Where the debris goes is another issue, it may bet back into the check valve. I don't know if this helps....I don't like these things but they are better than no hydraulics at all.