jack of one or two trades
Join Date: Jun 2005
Location: Suburbia, CT
Bikes: Old-ass gearie hardtail MTB, fix-converted Centurion LeMans commuter, SS hardtail monster MTB
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I don't think that pedaling backwards will help your stopping power any more than pedaling forwards.
If you divide up your pedal stroke into 4 arcs, you are pushing your foot in one of 4 directions (down, back, up, forward) throughout the revolution when biking normally. When you pedal backwards, you're pedaling in those same 4 directions, only in a different order (back, down, forward, up). It might work for developing some muscle memory for have a solid resistance all the way around the pedal stroke, but that's about the only benefit I can see from doing it.
*edit* Even then, when you are resisting the pedal stroke, the order of force is (up, forward, down, back). This is the same as the order for pedaling forwards, only 180 out of phase. I'm going to say that it won't help stopping at all.