I have the same thing going on. I have looked at every brake line connection. No leaks. I have run a gallon of brake fluid threw it bleeding the calipers. I have those spring loaded bleeder screws so I don't have to involve her. I tried it the old way with her pumping the brakes and me loosening the screws. No bubbles either way. I replaced the master cylinder. The proportioning valve is gutted. No internals and sealed.
They pump up hard. Let it rest for a couple of seconds and the peddle goes to the floor. I'm stumped. HELP !!!
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