maybe
I had the problem before and I fixed it by putting shrink tubing on the brake rods coming from the servo arm to prevent them from touching the levers that are pulled to apply the brakes. The ones curled around to make a hole. Check over the radio gear, take it all out, inspect the wires and make sure the wires aren't being flattened or damaged. Reinstal the wires and keep it clean and use foam to keep everything happy in the radio box, make sure the plugs in the reciever are ok too. Sometimes it's something little that can cause problems.