ORIGINAL: rcflip
You do realize that you need voltage to operate a servo to activate your servo to apply brakes.
...Reading fail. You conveniently missed where I spelled out the mechanical failsafe I have in case I lose all electrical power. But here, lemme quote it for you, since you can't seem to be bothered to find it for yourself.
I run three failsafes on my cars. I have an electronic one that jams the brakes on should it lose signal or the reciever batts get too low, and in case the batteries come physically disconnected, I also have a rubber band that will pull the throttle shut and apply a little brakes as well. Lastly I have a return spring on the carb itself should the linkage become disconnected.