Brakes going soft after raising car?

Tooljunkie said

Raising front end to get air to top may work. Leaving cap off? Rob i disagree. Brake fluid absorbs mousture from the air.

when i bleed brakes, i use a pedal depressor and do it myself. One pump,lock pedal down and open bleeder View attachment 1715635306

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Although air is not "in the system" normally, there is air between the cap and top of the fluid in the master cylinder. There is also a vent in the master cylinder cap. The cap is there only to keep fluid from spilling out, it's not an air tight system. That's not how it works. I do agree brake fluid does absorb moisture. But it's designed to. At least everything but DOT5. Were it not for fluid sloshin all over the place, you could throw the masted cylinder lid in the ditch and go.