I think DougB is wrong and KevinC is right. Something else is also wrong. I ripped off a rear break line but still had front brakes. The proportioning valve shut off but still leaked some. Your front breaks or proportioning valve must not be working.
I had forgotten that the Mitsu had only one rear bleeder. I have a Toyota rear with bleeders on both sides. I also had hand breaks until they rusted off. Now I use a line lock.
Bob Shaw

87 Raizer, 4.3V6, Mod TH700R4,231CHD, detroit rear and LSD front, bouncy seats, 2" lift and 32x15 BFG MT tires.