I have a Sora R3000 brake lever that I can't seem to figure out. This is what I've done. The barrel adjuster is screwed all the way in. I've pulled the cable taut and secured it with the pinch bolt. I've cleaned the lever arm on the caliper. I've checked to make sure the cable isn't getting stuck or pinched when running through the housing/frame. After I've done all this when I pull the lever it feels fine at first but then I hear click at the lever like something didn't engage and it becomes loose.