A shudder while braking indicates warped rotors. And at 2mm I would definitely recommend replacing the pads. As for fluid, don't worry about it. Unless the fluid is discolored, I wouldn't do a thing. Don't trust the screeching wear indicators because after 60k miles, the indicators can actually be bent back or rusted/broken off. If you came into my shop, I'd recommend changing the pads/rotors. Its a fairly inexpensive job.