well in order for it to come out the back it's the last o-ring or whatever you want to call it.
The only thing in them is cup seals or o-rings and then springs, they call the alum. pieces the cup seals go on pistons, and the springs ride on the end of them. Very simple and easy enough rebuild but for the price you can buy one already rebuilt and just swap them.
I got my info from Curt, (crazy4offroad) he had told me and probably others that if it leaked between there, sure sign it's bad. I recently bought one for my 88, autozone wanted $26 or so for the rebuild kit, just 2 pistons, 2 springs and some seals if that, OR the same price maybe $1 or 2 more for an entire rebuilt MC, the body tank and all, bolt on and go, after bleeding. No question, I went with the entire unit.
LMC has a brake down on the brake options, go over to their site and check it out, pull a drum and measure your rear shoes, that tells you the option, if not and you can read your RPO sheet,(highly doubtful) get it from the sheet. That sheet is usually on the inner fender underhood or in the glovebox, maybe both? Our 86 with a/c had it in glove box, our 84 was on the inner fender.
Another tip, buy some GOOD penetrating oil, kroil deep kreep, pb blaster something and soak them bleeders for a few days, before bleeding the system, also may just want to invest in 4 new bleeder screws to avoid trying to clean out the old ones.
