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it can be a weak line that expands when you pump the pedal, if the pedal goes all the way to the floor you can pretty much rule that out though. but if it only happens when hot then you have a leak and something got in the system that reacts to heat more than hydraulic fluid, again, prolly water.
you'll have to bleed the brakes if so, no biggie.
you can *maybe* pump the brakes with the master cylinder cover off to see if any water rises to the top, then it can evaporate.
don't smash the pedal when you do that, you'll blow all the fluid out the top of the master. slowly.....
you can feel each hydraulic line going to each wheel to see if it's a weak link.
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