Mudboyzjeep92

So I did bench bleed it and that rear valve has been gone out the jeep since I have owned i andt that’s 6 years ago and rear axel has the disk brake conversion all this started right before Covid my xj was down and we were going on a wheeling trip so I took my MJ went on some trails and ripped the brake line out the axel I fixed it few months later took it out again the jeep did it again fixed that and now this problem the system did have allot of rust in the rear and when the brakes would be used the rear passenger side would lock up but now it doesn’t do that anymore

Hello everyone I’m new to this group I have a 90 MJ and I’m having brake issues my issue started with the pedal just going all the way to the floor. I bled the brakes and worked a little bit and went back to doing the same thing I have recently yesterday changed the brake booster, and the master cylinder played all the air out of the entire system and my brake pedal is still spongy and goes to the floor only thing I haven’t changed is the proportioning valve all this started a few years back when I took it off Road and ripped the rear brake lines out of the axle and it’s been trouble ever since so sadly I haven’t parked and really don’t drive it does anybody know what it maybe