RE: Do wheel brakes exist for trainers?
what about these solutions:
1. use a braking plate that uses the spring of the nose gear as a pivot. see attached picture
2. use two nose wheels and two servos tied to two channels. two nose wheels are close together at the front. when you want no brakes, they are parallel to each other, when you want to brake, you toe them in a little. the more toe in, the more braking action.
VOILA!