Depends on where your Break is. If it is in your arm go to the doctor...if it is in your frame....weld baby weld! Then again if you meant brakes they are pretty easy to do yourself if you are handy. I have swapped mine out and worked on my wife's a few times. If your rotor(s) are warped time to buy some new ones. If you jus tneed to swap pads makes sure that you ahve the rotors turned at a local shop or an Autozone. A lot of places do that and it is usually very cheap...$25 or so.
As for the goo, that is brake dust. Got to love it. I am not sure what pads came on yours but I had ceramic on mine. Maybe it was a fluke

You will still have some dust...even though many companies say theirs are dustless

. I picked up my pads and rotors from Autozone/Checker.
For good rotors, there are a few posts saying that the slotted are good but to not get the drilled. I have some Duralast rotors on mine along with some Raybestos Ceramic Pads. WHen you do swap out your brakes make sure you pick up some lube, one for the clips and back of the pad along with some disc cleaner to clean off the factory oils off the rotors. Total time to swap them out is about...an hour or so depending. Usually takes me about 2 but I screw around a lot when working on my KJ

Plus you there is always time for beer.
