Wilsons Sandbox

I have not really followed the sticky brake messages but I will only make a humble suggestion. First I will agree that the problem resides in the brake line or the master cylinder. Maybe a bad fluid return into the master cylinder after pumping. If you have not tried, connect a plastic hose to the bleeding valve on the calliper. Connect the free end of hose to a dose syringe or anything you can use to push brake fluid in a "retrograde fashion" up the line. Before doing the "retrograde" syringe thing, open the master cylinder, and empty most of the existing fluid. When you pump the fluid up the line, watch that the master cylinder is filling properly. If not, the problem is confirmed to be in line or master cylinder. Then disconnect brake line from calliper. Try to connect a hose to the end of brake line, do the same trick with the syringe....if no go...absolute confirmation that problem is in line or master cylinder. If you have the stock line, install it, and try again.....if no go....problem is with master cylinder.....if a go....problem is with line. Though, a problem might exist between bleeding valve and brake line, within caliper, but that would be unlikely, that's why doing the syringe thing directly into line seems necessary. My humble ignorant suggestion. Phil