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I see what you did there.
Story is I'm blown away that MSF teaches 4 finger braking. My mother and sister took the level 1 course in Concord, NH this past weekend and, while talking with both of them, braking came up in discussion. They actually MAKE the students use 4 finger braking. Looks like I'd fail miserably as I just wouldn't ever do that.
Additionally, I'm very surprised how many 4 finger brakers there are here on the forum.
I don't view 4 finger braking as particularly safe or a good habit, IMO. I'm not knocking anyone by that statement....to each their own and I respect that.
It becomes more challenging (for me anyways) to navigate the bike if I only have my thumb on the bar while I'm trying to slow the bike. Seems like it'd be better to have as much contact as possible on the bar during a braking situation because that affords me the ability to use more steering control rather than trying to steer with 4 fingers on the lever to slow the bike down and still manage consistant and smooth braking.
I used 3 finger braking for the longest time until I took the Cornerspeed class at VIR. The single biggest thing I changed with my braking habits after that class is now I use two all the time.