My buddy has some Tektro Novela Mechanical discs on his Motobecane outcast 29er. The back brakes arent working anymore, they click, as if the are pulling to far, and then the calipers dont even move. They start working after i mess with them a little, but eventually stop working. Cant figure out how to explain whats happening, hoping someone else has had a similar issue and knows a fix! any questions, ask, just trying to get this bike working again.