Based on the OP's description of the repeated symptoms, I'd say it's debris/gunk in the proportioning valve, and/or the brake hose to the rear slave is delaminated and blocking return flow.
Definitely time for a flush and new hoses.
I have never been very good about maintaining brakes properly. I tend to ignore them until they fail in some manor. Stupid, I know, but it still a fact. I am going to make a concerted effort and set up a schedule to flush the brakes periodically and be more proactive.
I thought the brakes on my '83(all original parts) were good until I rebuilt the MCs and installed new hoses, Earl's delink kit. There was a night and day difference in the feel and performance.
Sounds like definitely time change all your fluids do it yourself or taking somewhere to get a complete fluid change
Rear Brakes Locking Up
in Venture and Venture Royale Tech Talk ('83 - '93)
Posted
Sounds like definitely time change all your fluids do it yourself or taking somewhere to get a complete fluid change