disc brakes on a mountain bike?

jeff c · 07-17-2007, 07:06 PM

We bought an haro V2 bike for my girlfriend we just want to use it on the road and maybe some light trail riding but not so much just mainly on pavement and or dirt roads. I took the wheel off today to put it in the car and didn't realize you had to do something to the disc brake itself.. Now there is this thing that they say is activated when the wheel is off from the bike and now the wheel won't go around. I guess its a second retention thing or something. WTF is up with this. Why did bikes have to get all technical. I guess I am just old school and am only used to the regular V brakes. Can somebody help me here?