Impossible to answer from such a short description, but probably you need to tighten the cables one way or another.
Try the related links.
name a bike that does not have back brakes ? :S If it didnt you would go flying like superman off that front of the bike everytime you braked from high speed
most bmx bikes dont have front brakes now ans if you pedal backward and it has pedal brakes its not a bmx bike
You would need a screwdriver & a wretch to fix your bike front & back brakes. They are very easy to fix if you know what you are doing. So if you don't know what you are doing find someone that does or watch online videos.
Yes
The Mongoose Rebel Is a 20" Freestyle Bmx Bike
Yes
Well it depends on the year of the bike and what you are looking for. Older Mongoose ( pre-2000) were decent bikes. Now they arent that good so no doubt Hoffman is the better bike.
depends on the bike and the brakes. Go to www.parktool.com or www.sheldonbrown.com for more.
It is a company. There are skates, skateboards, and more. Not a bike type.
Mongoose
well that movie was shot back in 1983 mongoose was one of the top bmx bikes of the time so my best guess would have to be a1983 mongoose supergoose by the way the bike looked in the movie or it was a mongoose motomag they both looked practically alike hope this helped
Disc brakes and drum brakes.