Braking in a bend is usually not a good thing, but sometimes you have no choice. All you can do is apply bad weather tactics, applying the brakes as slowly and gently as possible. Use both brakes because you get more drag from less effort. You can slow safely with both brakes at a rate that would guarantee a skid using one brake. I've found playing in the dirt that it is much easier to recover from a sliding rear tire than a front. But, if there is any chance the rear might lock up, pull in the clutch! Otherwise, a rear lockup kills the engine and that, in turn, can keep the rear sliding.