You need to give us a better description to clear up the confusion. Does "the levers dont pull back completely" refer to pulling back towards the handlebars when you're pulling on them or that they don't fully return to their normal rest positions? And is this on the bike with the levers hooked up to the cables and brake calipers or just the levers on a set of bars all by themselves? Your economy of words leaves a lot of guessing for us to do.

Also it's BRAKE lever. A BREAK is something you take at work or what a buddy gives you when he gives you a lift home when your bike broke down.