question on crawler jerking when on, and braking
 

I was wondering if someone can help, when my crawler is on once in a awile it will start jerking like it is getting radio interference. I have the super duty novak speed controller and i have seperated the wires the best i can. any help on this would be nice.

Next is there a way to have the cralwer brake downhill?

are you using a fm or am radio and is the antenna touching anything metal

its an airtronics mx-3 fm 3 channel and the antenna is not touching any metal

I'm running the same esc and had the same thing happen when I first put it together. My esc and rx were next to each other so I moved them away from each other and also you might check where your power capacitor is sitting. Try to move it away from any signal wires and the rx. This cured the glitching on mine. Hope this helps yours. I think the brakes pretty much stink on the super duty. Going downhill they rarely are strong enough to stop me.