You need to be able to brake in two separate ways, in case one fails.
So that's either two brake calipers or one brake caliper and back pedalling, which won't work with a freewheel.
I get that, OK, but I didn't even consider this as I never had a brake fail on me? As I said, my commute to work is quite short, less than 2 miles and I rarely go Super Man.
A well as the safety issues, it's a legal requirement! :)
@ChrisDD started
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You need to be able to brake in two separate ways, in case one fails.
So that's either two brake calipers or one brake caliper and back pedalling, which won't work with a freewheel.