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It does sound like you may have a warped rotor possibly due to malfunctioning caliper. (uneven wear).
1/8, 1/4 inch of pad left, replace them, and NO, you cannot replace just one pad or one wheel, well you could in a pinch--but they should be done by axle, do all front, do all back.
NO,no daylight between piston rotor and pad, they touch lightly.
Volvo emergency brakes are inside the rotors and have separate shoes, they don't engage the regular pads.
Just cap, or pinch the brake line once you have removed the caliper, the idea is for air not to get sucked in the line, and don't press the pedal whatever you do--you'll have to bleed the brake line at least on the side of caliper replacement after all is installed. And you can replace the calipers one at the time, same with the rotors...
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