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You'll be way ahead by making it a completely separate system. I presume your goal is to make a system superior to and more reliable than the stock system. If you plumb it into the existing system, you will have actually increased the potential points of failure and one failure will still...

I for one will be glad to see some real world info from them. Please post your results once you get them on and try them out, good bad or indifferent.

We may be working from slightly different baseline assumptions. I'm envisioning coming up in a light that suddenly changed and mashing the brake and having the pedal go to the floor. (And I'm also thinking m35A2) The question at that point is what stops the truck in the least distance. I'm...

Depends. On an M35A2 you don't lose much by killing it - there's no power steering. In your M925A2, absolutely don't kill it - the power steering is must have. But then, your M925A2 has full airbrakes with springbrakes so it's something of a moot point. Edit to add - this reminds me of an...

You got me. I wasn't thinking A3 until the last sentence. That being said, yeah, killing it and downshifting should still be effective as long as the initial speed was high enough where the lockup TC is locked. (A3s have a lockup converter don't they?)

Kill the engine, downshift, pull the parking brake but expect it to melt, pick something nonliving to hit..... I agree pinion brake should be better than nothing, just not enough. I haven't seen a satisfactory solution. Again, your dual circuit A3 brakes are the best answer...

No, and no. Neither pinion brakes nor the park brake are adequate to appreciably slow 14,000lbs from highway speeds. Your A3 has the dual circuit brakes. That's the best solution going. That, and diligent maintenance.

Five times the rpm of the axle is going to give you 5 times the friction. There's not enough mass in the pinion brake to absorb the resulting heat , even at 40mph. It'll melt. Otherwise this would be the solution to the single circuit brake problem ...