I belive it is either--
Before I write up how to do this, check your manual and look for instructions on how to set your linkage up. The prolly have pictures, and can explain it a bit better than I
#1 your linkage
#2 the trim on your transmitter
Option
#1 Your linkage if not set correct, will apply brakes when the trigger is released.
To fix this, turn on your transmiter, turn on the reciver in the truck, but do not start it. Put the throttle tim to center on the controller.
Check to see if their is tension on the linkage (wire rod) that goes to your brake.
If their is tension, keep both the truck and the transmitter in the on position. Loosen up the set screws that are on the brake rod. Relive the tension until their is none left, when your finger is off the throttle.
Be sure not to loosen the brake too much. If you do, when you hit the brakes it will only take up the slack, not activate the break. Also be carefull as this servo is the same one that controlls your throttle.
So while your at it, take the air filter off, look inside. Make sure that when you pull the trigger to the Wide open throttle position, the carbuerator is completely open.
Make sure when you release the throttle to neutral, that the carburator is almost all the way closed. Also be sure that when you hit the brakes, it does not close the carb further.
Option
#2 The throttle servo also controlls the brake. If you have the trim set too far back you will have a problem. You will ot reach full throttle, and when you release, thhe servo will autmatically rest in a position that applys brakes.
