Sick6stang......
Like HimotoRacingUSA said,,,,,You MUST have your brakes properly adjusted so that they are FREE to float when you are driving and only actuate when you Apply the Brakes. If they are Rubbing while you are driving,,,you WILL wearout/destroy the brakes very quickly.
Having SAID that.....
There are a couple ways to increase your Braking Power.
Run a Hump Pack battery for more Power to the servo.
The first is to upgrade your Throttle/Brake to a QUALITY sevro, (Spend at least $100).
The second way is to ADD mechanical stopping leverage. (See the picture of MY Truggy)
It Still helps to run a Quality Servo.
I can nearly FLIP my Truggy with MY set up........