Well, I don't know about stopping distance, specifically, or about the effect of struts alone, but I will say that I thought my old tires were completely toast until I replaced my struts and springs. I used to activate the TC all the time on takeoff, but that stopped. I used to get push in corners all the time but that stopped, too. My improvement in traction was significant and noticeable on the street. I can only assume that that would have meant better braking, as well.
