To be honest, I never noticed brakes dragging much, or enough to be noticeable. Except on the LST with it's dual steel brakes that would get grabby as they wore down.
If it's pretty grabby, it could either be the bearings on the bell are dry/seized or the clutch spring is broken/weak letting the shoes drag all the time.
Traxxas uses the same shoes on quite a few trucks:
https://traxxas.com/products/parts/4146X...
The t/b servo on those weren't very good. I just recommended someone else get one of these for their savage for t/b:
https://www.amazon.com/JX-DC5821LV-Waterproof-Mental-Crawler/dp/B079HZL171
Here...