I'd think that the rear brake would be more than adequate as it's operated by your foot, which means lots of pressure. If you can lock the tire, it's more than good enough. Is it adjusted and set up properly?
I was talking about the rear drum arm also...I've never heard of anyone extending that one. I guess if you have a small lever for your foot, it might be and option, but the force of your leg and foot on the brake lever should have been enough. Perhaps a longer brake pedal would be and easier fix??
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