The strange thing about this one is that it doesn't act like there's air in the line.

When the brake lever finally strikes the end of the piston it activates the cylinder and the brakes work fine. The problem is that the brake lever doesn't contact the end of the rear master cylinder piston until it is at the bottom of of it's travel. It almost looks as if the master cylinder was mounted too far away from the end of the foot brake lever.

Another thing I find interesting is that there is no adjustment is the rear brake what so ever. There is just a post that protrudes from the master cylinder that the brake lever pushes on.