if you ever come across a problem like this what you should do is get a pair of plyers go to the front of your bmx and you should see a silver wire type of thing and a bolt. what you need to do is loosen the bolt a little bit grab the plyers and pull the silver wire as much as you can but not too much that the wheel cannot turn freely. when you have pulled it really tight you need to keep it pulled and at the same time tighten the little bolt as hard as possible then you need to try your front brake and it should work better. i hope that this helped you.