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I took my car into a reputable shop and had them fix a dragging caliper. They replaced the caliper on the left as well as the rotors and pads on both sides. The brakes sounded great for a day or two but now I get a rotational thumping sound when I brake from about 20 mph until I stop. There is no discernible sound when braking at faster speeds. Also, no sound while braking in reverse that I can tell. I am going to bring it back in sometime next week, but do any of you have any idea what this could be? The braking feels fine except for this noise.

Thankfully it was just something rubbing and they fixed it right away. They generally do really good work so I'm going to just assume this was an anomaly for them.