I have the Mini-Hobbies MHBrake electronic brake valve. It has two receiver leads. One connects to the Brake channel and one connects to the Retract channel so that when the Retracts are Up, the brakes won't come on while using Down Elevator in flight and use up air. I put in a separate air tank for the Brakes, so that is not an issue in my plane. I chose Ch7 as the Brake channel.