I ridden months on a geared racer without a fully functioning rear brake. Whether it is dangerous or not is debatable. However when the front brake cable goes you won't be putting your feet on the floor when rolling (v.slowly) down hills.
I don't see how you can be comfortable hurtling down box hill or the like with only a front brake. If the hill has any type of cornering it will be even worse.
I don't see how you can be comfortable hurtling down box hill or the like with only a front brake. If the hill has any type of cornering it will be even worse.