Why does my rear wheel make a grinding sound while I'm not pressing the brakes? It goes away when I touch breaks and is otherwise a persistent grinding sound.
by 
jason10
ANSWERS: 6
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How long/how many miles has it been since you greased it?
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That was happening on my car, and I thought I had to change the brakes, when I took the wheel off it was the cushing pin that came undone and was rattling/grinding in it. Put it back and it completely stopped.
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Certainly sounds like your brake pads are down to the metal. The grinding sound you hear is the pad rubbing against your rotor.
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it might be that your break pads are worn. if this is so, get them replaced asap.
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Didn't say what kind of car you have or thee year. If you hear grinding while no brake applied if you have drums on rear, could have a piece of the hardware kit loose or lot of brake dust that cant get out until you pull the drum off. If you have rotor on rear then may have a warped rotor. noise goes away when brake applied due to caliper pressure
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Thats your brake pads worn down to the metal get them replaced pronto!
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