Hi my name is Josh and I have a 86 Dodge Diplomat, and my brake pressure will not stay.I can pump it up but after 10 sec or so the pedal goes right to the floor. I have changed the Master Cylinder, Proportioning valve, and the brake lines from front to back.I also have new brake cylinders on the drum brakes. I have done bench bleeding and bleeding the brakes from the bleeders to the master cylinder. I have run out of ideas and would appreciate any help and tips.Thank you.
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