Watch the Brush Dynamics online guitar lesson by Danny Gottlieb from Master Class Drum Lessons
The Morello method, using different stick heights works with brushes as well as sticks. By developing the reflexes you find that you can make controlled movements even when there is no rebound. As shown in the video clip, by starting each stroke at a different level, you can change the dynamics without tension. You can use the full stroke, half stroke, down and up strokes with brushes.