"It appears obvious to me that there is some fault in the system even though no fault codes are stored."

It would seem so wouldn't it. I can just imagine what you are thinking about this post Gilly. It is however truthful and completely factual. I wrote it up just as I tried it. The system does in fact function just fine on flat ground. The warning triangle appears and the brakes operate to control wheelspin. When the wheel began to spin on the track there was no warning or intervention. I have heard many stories about this system setting fault codes on the new G's. Wouldn't it make more sense that it would default on the code setting side rather than fail and not set any codes? The truck had just returned from the dealer that day as well. They had it hooked up to a diagnostic computer. Even if I see no codes on the display, wouldn't they show up when the dealer accesses the computer?

What should I do? Take it to the dealer and tell them it works fine until I get it all bent out of shape on an off-road abstacle?

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1995 G320
1984 280GE
1971 Unimog 416