Cletis -
I guess you could look at it that way. But since the truck is a 20-30 y/o frame off that sat for a while, I'd rather spend the extra $50 or so to replace the older parts to make sure that I know what I have. Not spending the $50 would look pretty foolish if I ran the truck into a tree because the brakes failed.
As far as diagnosing the parts, I do plan on doing that, first to the proportioning valve (as best I can, it's not like you can disassemble it), and second to the MC. However, doing so will call for me to either replace the MC or buy a rebuild kit, which wouldn't make that much sense since you can buy a new one for almost the same cost.
I dislike spending money as much as the next person, but in this case, I don't feel that it's a waste given that the brakes are a vital part of the truck's safety equipment.
If I spend the money and I still have the problem, shame on me...
Chris
