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[WhiteGardens]

It's funny that you mentioned all the things in your post, only because of the lot of thinking I do, and trying to take most of those points in consideration.

So, if I'm reading you correctly, even with the adjustable proportioning valve, there is going to be the variables of driver input, and load weight.

I was looking at the Astro-van MC and Hydro boost and noticed that GM had a proportioning valve that (how I would describe) metered the pressure to the rear brakes in relation to the pressure of the front disks. If I've read correctly does this mean that it adjusts properly to compensate for driver input ?? This would probably be the better setup as it would leave less room for error with no manual adjustability.

I used to like my RABS until I had issues with the rear dif, and a couple of panic stops left me white as a gost. The last time I used the truck, I noticed that my RABS light wen out and I don't seem to have the break-fade that I had before.

I understand what you are saying about liability. Something that I didn't take into consideration. I would still think that I would have a little more peice of mind stopping with the porportioning valve knowing how it's going to react rather than a RABS system that has a mind of it's own.

My other thought is, that I want to mount the lever for the valve in the cab so I have adjustability on the fly, loaded or un-loaded. I also chose the lever style with 7 positions as you might loose the position of the knob-style more easily if you tweak it too many times.

I don't know, the way it is now, it's almost scary. I drive it like a dump-truck so my following distance is greater than average and I'm always at or below the speed limit, but once you need to stop in a hurry, I want that reliability.

Regardless, even if I install the manual valve, I'll need to do some thorough testing loaded and un-loaded to achieve the best results, and mark those positions on the valve. My neighbor is a big-rig Mech, so he might have something to measure line pressure after initial setup.

Potentially, I might also up-grade the rear drums to disk. I found a company out there that has designed a kit for the dually, utilizing a Lincoln disk and caliper. (usually only see the kit for the single wheel, so I was surprised to find the kit). If that happens I'll probably have to re-configure the prop-valve again.

Thanks for the post FMTRVT, if you've got any more thoughts or insight into this, by all means feel free to post.

Also, I don't think I have the load sensor/lever on my truck.