I have a XT675 engine and it will not shut off. I was looking at the kill switch and it apears it grounds out the coil through the brake pad. I can not see the entire assembly well with our removing it, so I may be wrong. Can some one confirm this. If so can I just replace a worn brake pad? It appears from my limitted research you need to replace the entire assembly. Thanks in advance to anyone adding some clarity to this issue for me.