1984 Ford LTD--Power Brakes NIGHTMARE (TIA)

H E L P!!!
Brakes are fine right after they are bled. Then the pedal becomes spongy and with each successive brake application the pedal travels further to the
floor until there is little hydraulic pressure and the car barely stops and then they have to be bled again. There are no fluid leaks and the lines are full of air. I am at a loss to explain it. I had to replace the rear wheel brake cylinders because the bleed valves were broken. This occurs within 5 to 10 pedal applications. The emergency brake is properly adjusted and fully functional. When you step on the brake pedal you can hear a hiss or vacuum sound from underneath the dashboard too. :-(
You can email me at snipped-for-privacy@cox.net or Post here. I'd be greatful for any help anyone can provide!
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you seem to have a leak in the master cylinder ?.
HJK wrote:

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Seems like the master cylinder is bad, replace it and then try again. Make sure to Bench bleed the thing when you buy it!
or Post here. I'd be greatful for any

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