It should be similar to the impact you had.
when you have a front one-way only the rears will be able to brake. if the car is spinning out under braking, you are probably grabbing too much brake.
Remember, that a tire only has so much traction. You can use this traction for accelerating, braking, or turning. If you are doing any those things simultaneously you will probably be overloading the available traction for the tire and that tire will start to slide. For maximum braking effect, brake in a straight section, and not in a turn.
Setting up you car is also critical for getting the most out of your braking ability. Try playing with the rear toe and droop settings. The back of the car gets light under hard braking, but a good set up can minimalize the car sliding out side ways.
some fellas like to set up their cars with drag brakes, where when your finger is off the throttle, the brakes will drag. There will be no coasting/ neutral.
Personally i like to use push brakes, where there is a neutral position and the car will be able to coast. Ive never had luck with drag brakes, i find its easy upset the car in a turn, its hard to fix your line too.