UFOs about to go in...

[Djdawson2 at aol.com]

Brett's got it right.  You certainly don't have to crack the bleeder screw to
compress the caliper, but crud moving back in the master cylinder becomes a
possible issue.  If you haven't done brake work before, you'll soon see why
you must compress the caliper... to make room for those nice thick(er)
rotors, and new pads.  If you're going to compress the caliper after cracking
the bleeder screw, just try and make sure the bleeder screw is the highest
point... air won't go down into the caliper, but it will go up.  Keep
compression pressure on the caliper... fluid oozing out, and then tighten the
bleeder screw back up while still compressing.  You'll be in good shape and
you can bleed later.  Just double check your brake fluid level when you're
done.
Good luck,
Dave