which failsafe did u fit?

u do understand how they operate dont u? if the truck makes a run for it then u sometimes have to switch ur transmitter off (i know - it sounds silly) so that the failsafe realises it is not recieving a signal, and then it will apply the brakes - so long as u setup the failsafe correctly...

apols if u know all this, i am unsure as to ur level of knowledge in rc, im not trying to be patronising or anything like that, hope that helps somewhat.

oh and i hope there is no/little damage to ur truck - it sucks when this kind of thing happens.