Mark, I am positive the problem is not at the bleeder screw. And, I used a wrench. Since my last post, two other things have come to light. 1) I think that I can test the master cylinder itself by disconnecting the offending brake circuit and attaching a hose to that master cylinder connection. Drawing a slight vacuum on that hose must produce only brake fluid, and not air. 2) It was suggested that hydraulic brake light switches have been known to act as check valves. I swapped these switches from my old master cylinder, so they are not new. I can reverse their positions and see if the problem stays in front, or moves to the back. Thanks for your thoughts, Mike |
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