Vehicle Problem? Please help ASAP

Hey guys, this may not be LUA but I would of thought you guys could help me with this.
I’m implementing go-karts and golf buggys into my RP server, and when testing these vehicles I tried to E-brake and it crashed the server.
These are the settings files:
Go-Kart: http://pastebin.com/sw6NJ1dx
Golf Buggy: http://pastebin.com/TRpXj3FN
Working black car (for reference): http://pastebin.com/5SkGnWDN

If someone could fix this or tell me the problem i’d be very thankful and willing to pay in some form.