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1. The rotors were not turned i.e smoothed down with a tool, and they are wearing the pads into the shape of the rotor grooves,

or

2. there was no lubricant applied to the pads when installed (to stop noise)

or

3. Nearly worst case - a pad fell out.

4. Something really bad - take it back to see a mech.

Some things to look for - Stop the car, turn all the way left. Turn off the car, get out look under at the pads (they're the things that make contact with the rotor attached to the hub next to the tire) on the passenger side -see that they are still there. Turn all the way right, get out look under at the pads on the drivers side.

Source: Replaced and worked on my brakes for many years as DIY.

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Q: Why are new brake pads grinding?
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