I bought a 3racing F113 combo(with the speed passion reventon R esc and 17.5R motor)and got around to running today. I'm using a spektrum Dx2 radio and set it up per manual. Took it out for a test drive and zero braking. Then tried a few other radio set ups I have and still NO brakes. Did I get a defective unit? Or am I possibly missing something? Any help would be greatly appreciated. Thanks!