I got caught up in some barbed wire around my rear brake line and caliper. I replaced rear brake line, piston and dust seals, and a bent pad clip. I bled the system and nothing. There is no change in the feel of the brake pedal. It feels like there is no resistence at all, the caliper piston doesn't even look like it wants to move. My next step is to tear apart the master cylinder and check the O rings. Beyond that, I'm lost. Maybe replace the piston? The bike is a month old, it's driving me nuts looking at it and not being able to ride it! PLEASE HELP!