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Sounds like you need a new master cylinder. That's what cured this condition for me. The pedal would come back, but the brakes would stay locked and even hold on a hill in neutral for about 2 seconds. This was after new front hoses had been installed.
 

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Super Moderator
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It's easy to disconnect the lines from the master cylinder. Make sure to use a tubing wrench, which looks like a box wrench with one of the 6 sides cut out to slide the wrench over the tubing. It will grip 5 sides of the hex nut instead of only 3 sides like a box wrench does. This will prevent rounding off the nut.

When replacing, a master cylinder MUST be bled of all air before bleeding the air at all 4 wheels.
 
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