Im about to attempt rebuilding both of my front brake calipers on my 91' R100rt. One disc is partially corroded where, Ive been told, the piston isnt making full contact with the disc. The rotor is a little out of true (0.007" - still within spec per Clymer), and this might be causing the problem, but I would like to rule out cheaper repairs prior to more expensive repairs. I figured I would do both calipers while Im at it, even though the other isnt showing signs of malfunction. The Clymer manual mentions nothing of the cross-over brake line connecting the calipers (the solid one that runs under the fender). Are there any precautions I should be aware of before detaching these lines from the calipers?