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Except for low speed braking on poor surfaces I hardly every use my back brake. Or, as Hogpro stated, in a pucker-type situation that I need every last bit of braking power on tap. When you start to brake you have a significant weight transfer to the front of the bike. Somewhere around 70%. This means that the rear wheel gets lighter and that brake becomes less effective and more likely to lock up. Since the front does most of the work that's what I use.
As for yours not even being able to lock up, before you go and buy new pads try bleeding it and see if that helps.