I got a new Master Cylindar the other day, and I installed it. When I bought the bike, the old one was beyond repair, so I never messed with the front brakes. I took the caliper off and cleaned it up. I pushed the piston in, it was tough, but it moved. It was similar to a car's piston. I put new brake pads on, re-installed the caliper, then bled the brakes. Now, the front wheel will not turn. The caliper does not free up at all when the brake lever is not being depressed. What would be the cause of this?