Hello,
So, there isn't a whole lot of information due to the vehicles age, but it looks like the Metering Valve, which is part of the Combination Valve, must be held open while pressure bleeding this system.
So, the Combination Valve is going to be on the brake line, I believe the front lines run through it, but there are no diagrams for this. It applies to disc brakes so I would think its balancing out the front brakes. It does not say how to open the metering valve, just that it needs to be open to bleed them.
Have you tried bleeding the Master Cylinder? It's possible that the Master is clogged up in a couple of passages. Of maybe the Combination Valve is bad all together. You should be able to find it by just following the brakes lines. This is all the info I could find. If I come across some more ill update it here.
There's also the Height Sensing Valves in the rear, these might have old brake fluid in them and be clogged up as well. Just trying to list possibilities here.
You may want to replace the Master Cylinder too if the fluid had a dark color to it, that's the seals in the Master going bad.
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Tuesday, October 19th, 2021 AT 10:28 AM