OK, finally got the problem solved. I ended up finding a new valve on Ebay, and sure enough it works fine. All inlets/outlets on the valve work now. Got the brakes bled and all is well. Only took about 6 pumps and fluid came out of the rear cylinder(s).Just for the record, before I...

OK, well I got a replacement valve (used) from a salvage yard. But, I'm having the exact same problem! Here's the current status:I hooked up the replacement valve to the old lines, and immediately had somebody press on the brakes and fluid came out from both lines from the master cylinder...

My '76 F-250.

OK I went out and took a look at this again. The brake light is NOT coming on at all, when we press the brake or not.I did try clamping the bleeder rod IN just to see, and no luck, no fluid is coming out of the valve to the rear line. Also the pedal hardly travels at all, if that makes any...

Thank you for all of the feedback. Today I took a closer look and it appears that no fluid is coming out of the pressure differential valve (I'm assuming that is the same as the proportioning valve?) that runs to the rear brakes. I made sure that I pulled the bleeder rod out on the pressure...

Hello:I have a 1976 F-250 that had been sitting for a couple years, and I recently got it running again. Immediately I discovered two brake problems. There was a leak with the front driver's side line, and the rear passenger's side brake cylinder was also leaking (fluid coming from within...