Brakes serve as a safety measure for the tractor–as with most moving vehicles. As such, the competition requires that we have working brakes in order to compete.
Making sure the brake lines are not too complex is important for serviceability and manufacturability purposes. So what can be less complex than a straight line? Although, making them too short may cause them to break–no pun intended. They need to have a little bit of slack for flexibility and simple enough for easy maintenance.
The brakes section works closely with the frame, and body & ergonomics sections in order to achieve their goals.