JSMITH85; RCU no-longer supports Cen racing vehicles, I recommend checking out Cen's website, in the mean time, I would take a look at your throttle/brake servo, possibly that you have the alignment slightly off, causing the brakes to be pulled. Could be wheels are too tight, could be brake pads are too tight on the disk, spur gear mesh too tight, plenty of different variations of issues could be addressed. The moderators from the Cen website may know a bit more!