yea ive never had a air entering issue without fluid eventually coming out...And when i say air gets in the line im not talking about those tiny air bubbles - im talking like blobs of air get in there...only way that much air can get in there is my guess of the master. When i get a chance I'm gonna look up under the dash and see if I see anything...

for being the worlds simplest brake system its kickin my butt!

I know several others have posted in the past to ONLY go with the delco master cyl as even the aftermarket new masters are crap.