Rear disc is great.... not sure it's good with big tires.
In reply to:
i read something about having to "center" the proportioning valve when bleeding.
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Sounds like a 4wd.com "Tech Tip"
Somewhere (sorry that I can't find it) I saw a tool exactly for that. It was a small thing that clipped onto the proportioning valve while bleeding. Looked like it depressed a button (detent) on the side.
But then again I have never had one of those and don't think that it's very hard to bleed brakes if you just consider where the air is trapped.