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Who has done the disc brake conversion on their 14 bolt

K85 Octane said:
I went through 5 different MC. Disc/Disc, larger bore, smaller bore, residual valves in the lines, hydroboost MC on vacuum, etc etc. I'm running the smaller 1/2ton calipers. Outside of going to hydroboost, I've tried it all and even spent the money to have a couple different "specialty shops" try their luck as well. I'm not diving into hydroboost unless I get part numbers and can return everything if it doesn't work.
Until I hear from the retail stores themselves, which pieces to use, I can't see why anyone would by into this.
There are stories of them working and there are equal stories of them not.
Either way, you have no support from those you buy the kits from.

Best set up I ran, currently installed, is an '85 K30 MC with matched booster. Straight hardlines, no valves.

Always bled the system with the old pedal pump method. The shops used both vacuum and pressure machines to bleed.
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Not sure if this is your trouble, but when I did mine, I had to drop the front of the truck down and raise the back so the brake lines run up hill. When I was bleeding the rear calipers with the tires off and sitting lower than the front on jack stands, the air in the front-to-back line would just rise back up toward the master cylinder and never get pushed out. I couldn’t ever get rid of the squishy pedal until I realized what was happening. Might be worth a try.
 
I realized I didn't put a part number in for my combo valve. found one that had the same thread/sizing for all of the ports, but it's basically empty. No proportioning no residual nothing.
 
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