Air in brake lines..

lilfontleroy said

Used/old fluid will retain minute air bubbles that will eventually manifest as a squishy pedal.. if you are still having issues after you tighten up the lines, it's possible a fluid change is in order. Also, gravity bleed may not get all of the air out.. I would go as far as saying it rarely does.

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The fluid is pretty good it doesn't get used very much at all. And I have a tendency to bleed the brakes more often than most so it gets recirculated pretty well. And again I gravity bleed them and the brakes are fine. I use it a couple times and then let it set for a while and the brakes are not fine...