Recently purchased an 86 2wd auto TV, 118,000mi. Drove it to AZ state inspection facility to have it smog tested, they put it on the rear wheel spindles and then promptly told me they wouldn’t even test it because the rear brakes do not work. I brought it home, put the rear end on jack stands and sure enough, no rear brakes. I machined a little bracket to force the proportioner valve to be fully open all the time, it only slows down the rear wheels now. Manually adjusted and bled the rear brakes, still nothing. At this point I’ve got the proportioner valve 75% off, but the mounting bolts are just snapping. Has anyone used an aftermarket valve or successfully removed, cleaned, and reinstalled their own?