Rotor Replacement
You have to unbolt it, but don't need to disconnect the lines. Just don't hang the caliper off the line, if I need to have it loose for a while, I usually use a coat hanger or something and tie it up to the suspension.
Make sure you use locktite on the caliper bolts when they go back in. They seem to like to work themselves loose otherwise, and having a caliper bolt fall out while you're driving is no fun.



