1) Cheap pads. Replace with quieter ones.
2) Incorrect pads or rotors, replace with correct ones.
3) You screwed it up and something is in the wrong place.
4) It only makes the noise during the first three or four stops after you start driving. Consider putting semi-metallic pads on in place of NAO/ceramic types.
5) You are talking about rear disc brakes on a car with drum-type parking brakes. One or more of the new rotors has been improperly machined during manufacturing and the drum portion rubs the backing plate. Ask a repair facility or machine shop to remove a bit of metal from the rotor at that location.
6) You had an ID-ten-T error and put one or more pads on backwards with the metal backing in contact with the rotor.
7) You decided to rotate the tires while you had the wheels off. Front and rear wheels are not the same on some vehicles.
8) Something else.
Your pads or discs are worn. The brakes will fail soon if not replaced.
Brakes
A grinding noise when braking can occur when the brake pads are going bad. You are hearing the brake grinding on the metal discs.
97 grand am rubbing/grinding noise from right front that is not wheelbearing or brakes
Check the front brakes. the most common problem for grinding is worn brake pads allowing the metal backer to rub the rotor.
Sure it isn't scale on the discs? retract the pads and give the discs a spin.
What would cause a grinding noise after a tire is replaced and the brakes are not worn?
Diod you check front brake pads
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brake pads could be worn out. would it be safe to drive for now if the front brake pads are ok?
Normally a rusty rotor would not make a grinding noise. A grinding noise from the brakes usually indicated that the pads or shoes are worn down.
No! Something is wrong.