Hi Jake,
Yes, sticking calipers could cause a vibration at speed. Since the brakes were just replaced, let me suggest something. I don't know your comfort level with brake repair, but this is something basic you might want to try yourself. If the caliper slide pins weren't greased or properly greased that might be the issue. You could redo the brake grease on the pins. Go light with the grease. Just enough so the pads don't stick. To keep it simple, probably best NOT to remove the pads from the caliper. Plenty of instructions on this out there on the WWW. Brake grease available at any Auto parts store.
One more thought. Test those ball joints. Stuck calipers shouldn't cause suspension banging?? This will be easy for you! Jack the front end again and make sure the front wheels are hanging off the ground. This time grab the front wheel at the 12 and 6 o'clock positions. Rock the wheel inwards and then out to feel for any play. There should be minimal movement. If you are comfortable with doing this, you might be able to see the ball joint as it is close to where the wheel mounts. Safety first always! Check if the rubber boot is split or other visible damage.
JW
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Will I buy another Volvo??? We'll see....
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