I am not saying there isn't a weight transfer to the front on a trike, physics dictates that there is. And the braking power doesn't
move to the rear of a trike, bad choice of words on my part.
What I am wondering is if the 70% holds true for a trike as it does on a 2 wheeler. A bike has a
potential braking force of 50% on each wheel. As the bike stops the weight transfer moves a percentage of that force to the front, up to 100% like the stunters do when performing a stoppie.
Most trikes have 1 wheel in front, 2 in back, giving the front wheel 33.333% and the rears 66.666% of the potential stopping force. As the trike stops the weight shift moves the braking force to the front wheel. But, because there was more braking to begin with on the rear, less of the percentage is transferred to the front as compared to the bike.
Also there is usually about the same amount rubber on the ground front and rear on a bike. On most trikes there is much more of a contact patch on the rear wheels than the front. I would think that that would have some effect on braking, too.
I really would like to know-
Does this hold water or am I blowing smoke?
(How is that for mixing metaphors?)