So I have been trying to get the brakes working right on my 97 f150. Found that no matter what I do I get air spewing out of brake line. I even disconnected from the flex line and it spewed air from the hard line.

Funny thing is no air in front drivers side. I am at a loss here cause looks like only 1 hard line from passenger side to drivers side to a diffusing block. I see no leaks and no idea where the air can be coming from

 

LOL Ok was not air getting in, just a collapsed brake hose. Replaced it and like a champ

 

Glad you found the problem!