Vibration on braking is the classic signs of warped rotors, and no, you can't tell by looking. Bleeding has nothing to do with this, I'd get new rotors and go from there. The problem is that your car has the stupidest rotor/hub design out there that causes way more work than should be neccessary to change the rotors. Search for some DIY's on this, there are a couple here on the board.