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Zoom and Bruce have answered your most important question. Eventually, you may want to remove a rotor so that you can replace it, repack the wheel bearings, or work on a stuck piston. In that case you can unbolt the caliper, tie it to a spring coil, and gently move it out of the way (slightly bending the metal lines as you do so).
The "metallic loop" you mention is a spring clip designed to keep the hose/tube joint stationary relative to the strut, without overstressing it. It comes loose only if you completely unscrew the male metal line fitting from the female rubber hose fitting.
Loosening brake line fittings is something of a black art. You need special tools called "flare nut wrenches." These look like 6-point closed end wrenches with an extra-thick circumference and a small slot that admits the tube when placing the wrench over on the tube. The design maximizes nut contact area and minimizes wrench end deformation, making it less likely than conventional wrenches to round fitting nuts, which are made of very soft metal.
Good luck with those pads.
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'88 244GL, '89 244GL, '90 244DL, '91 244, '92 244
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