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Thank you for all the good info. We'll give it another crack with all this information and let you know how it progresses

Hello Everyone, I'm posting this for a relative who has an 87' DL Wagon (Carb'd, and runs like a champ). He found this forum and wanted to see if anyone here might know how to help with this problem. The wagon's brake lines rotted and were repaired. The system has been completely bled and when the car is off there is plenty of pedal pressure. However when you start the car, the pedal pressure goes away and is very faint, the drivers side front and passenger side rear brakes seem to not work. The car isn't leaking any fluid. We are stumped. Any ideas on how to troubleshoot this problem? Anyone else hit this issue before? Vacuum booster troubleshooting perhaps? Thanks for your help