Best to think of your brakes as two different individuals. Sometimes all rear is the right thing, sometimes all front is the right thing… most of the time, it will be some combination of the two. Modulation is key. Just remember that the front brake will scrub speed, and the rear brake will only maintain speed (ie- keep you from going faster).
In answer to the question, you should be heavy on the front brake with your leading foot bracing your weight to keep you from otb.