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Old 11-21-2014, 11:37 AM   #1
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Just want to double check

Car has a hum or whir from The back seat.


So I Jack the car up.


I shake both wheels no movement, up or down, left or right.


so I spin both wheels, rear driver: quiet

Rear passenger: noisey

What do you think it is?


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Old 11-21-2014, 11:45 AM   #2
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Movin' ya into Brakes, Suspension & Chassis

Wheel bearing is the obvious reply, describe the noise better to be sure.

(brake hdwe. broken & dragging/ drum against backing plate/etc. are other noise possibilities)
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Old 11-21-2014, 01:07 PM   #3
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does the sound change at all at different speeds? if you can hear a pitch difference at speeds, could be a tire. you can swap wheels from side to side and see if the noise moves.


Still leaning towards Sailor's bad wheel bearing though...

This site gives you a lot of info about bad wheel bearings:
http://mooreautoservice.com/auto-ser...heel-bearings/
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Old 11-21-2014, 03:43 PM   #4
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It gets louder with speed. Haven't noticed very much change while turning.



I don't think its tires because when I lifted the rear end off the ground and spun the wheels it made noise. Tires were not touching the ground.

Thanks for the link!
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Old 11-21-2014, 03:47 PM   #5
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Haha after reading I doubt its a tire, it stays the same for all pavement.



Thank you!
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Old 11-21-2014, 04:07 PM   #6
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hum or whir when spinning off the ground sounds like the bearing, squeals- grinds - etc. are more brake related.
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Old 11-21-2014, 04:34 PM   #7
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No squeals... Sounds like sand moving? How do I tell if its a rear brake? Not sure how grinding would sound like
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Old 11-21-2014, 04:52 PM   #8
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Your "louder with speed" pretty much nailed the bearing diagnosis.

Something rubbing doesn't often change volume that way.

"sand moving" can be brake shoes rubbing or drum on backing plate, not necessarily an issue. Usually don't get that when worn in from the shoes, common for new ones.
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Old 11-21-2014, 04:58 PM   #9
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I am pretty sure my drums are gone or close to it. I have not replaced them at all.

However the only thing that's a bit confusing is the lack of wobble.

Is that shh while slow moving mean its brakes? Because as I drive its a definite hum.


1/4 mile post! 1320
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Old 11-21-2014, 05:07 PM   #10
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There's a certain amount of low level brake noise that's normal most of the time when spinning a wheel by hand, nothing that you'd hear when driving.

If a bearing is worn enough to wobble, it's REALLY gone & might not make it far before falling apart. These ball bearings are different than tapered roller bearings that can have free play. Wear on balls/races will cause noise before any wiggle.
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