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'77 F150 4wd 351M V8. Started bleeding my brakes at the right rear, and nothing comes out. Same left rear. A buddy said to try the front ones once or twice and then move back to the rear. Front ones bleed just fine, rear still won't. The person pumping the pedal for me says it feels like a rock when we try to bleed the rear ones.
I'm goin to check to see if I have pressure where the line meets the rubber hose before the rear brakes...thinking the rubber hose may have collapsed. The fitting is being soaked w/ WD40 now. Any other ideas?
I think it very possible that you have a collapsed hose. As for the proportioning valve, my diagram shows that it's (or should be) located inside the left (drivers) side frame rail just about below where your feet rest.
You might have to sacrifice the steel line. It's very probable that the flare nut, besides being frozen to the threads, is also frozen solid to the line itself so even if you get the nut to break loose from the threads, the line will just twist with the fitting and break off.
The line really isn't too hard to replace. There is a union in that line about half way up the frame and the lines are relatively cheap.
Alright guys, I guess I'll start simple and work from there. I did find the proportioning valve. I'll try critterf1's suggestion first, and in the meantime I'll look for that union in the brake line. I haven't been looking for it up to now, but I haven't seen one, which with my luck probably means it's behind the gas tank. But I guess we'll find out.
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