Cool website this looks like what I am doing with the stock gear box.
from Tailing web site:
4. DISC BRAKE Kit price $5
Stop every time you want like the real car
A mechanism part in the gearbox
Keep Motor, Gear and Relay longer usage.
So this gave me a idea I just put in the wheel moded stock gear box in to the car with the relay and it's fast and will drive circles around my fast gear . You get the best of both worlds speed and brakes.
Thank you very MTL for showing me this site