1970 GMC - Disc brake conversion recommendations?

[SCOTI]

Originally Posted by HD2000

Well - CPP kit is on the way - another question...
Any low budget recommendations for master cylinder and prop valve?
Just hit the pick and pull for an 80s 1/2 ton and pull the prop valve and associated bracketry then order a new master for a disc/drum 80s truck?

Local parts store for the master. Most carry their 'house' brand as well as other manufacturers. Whatever gives you the best warranty....

Using the 73-87 prop valve can work but the lines are routed differently vs pre-73. There might be some difference in the two so that's a decision you'll have to make. Lines were def routed differently on the 71-72's vs square-bodies.