How do you stop this thing?

After yesterdays exploits with the golf clubs we went safe today with something that i know.
This was Camerons first time on a dirt track and to tell you the truth he was good considering he hadnt been on a bike in over a year.
Unfortunately our visit was cut short due to the back brake jamming on , which was preventing him from being able to jump.
On the whole though for £5 he could stay there all day if he wanted proving he had the fuel to last out.