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So wide tires will do nothing to the braking force except if they have a better coefficient of friction. That said, many wider tires have a better coefficient of friction.
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I couldn't have said it any better myself. One of those "unexplained" of auto-dom.
Like dragster rear "slicks." Which my brother explained given the torque, the sidewalls "fold" and allow greater circumferential belt contact with the tarmac.
"Gumming the track" helped too.
https://www.eng-tips.com/viewthread.cfm?qid=14638
The only time I've seen a Model A tire sidewall "fold" was a flat tire. Maybe good for stopping, but terrible on the "going."
Joe K