when using a one-way, i decrease brakes (10% less on the ATV) and try to modulate the brakes to avoid spinning out. this usually happens on the first lap with cold tires. however, during the course of the race, i feel i can brake more without spinning out because the rear tires grip much better. you can use brakes with a one-way, just be careful and try to "feel" if the rear end tries to slip away.