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Grinding in rear wheel
07-05-2011, 02:47 PM
Post: #1
Grinding in rear wheel
Grinding noise heard only while braking, brakes are good, drums are good, all parts in place properly, no foreign objects. Out of ideas of what it could be.
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07-05-2011, 07:56 PM
Post: #2
RE: Grinding in rear wheel
I would say that every time I have inspected a Brake Noise that I was told everything was in place properly, I have found something out of place. Usually a return spring on backwards or flipped over. The easiest thing to do is to take the drum off and give it a light shot of paint. Put it back on, drive around the block using the brakes a couple of times, and pull it back off. Look for where the paint is scratched off & then look at the area that could do that.

Sorry I can't be of more help without being there to hear it & look at it. Please let us know what you find.

Thanks for using the forum,
Garner

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07-25-2011, 01:21 PM
Post: #3
RE: Grinding in rear wheel
Thank you for your feedback. We first noticed this issue on the left side. We took off the right wheel and found the backing plate was out of place/bent. Carefully pryed it into place, as best as possible, all the way around the drum. Checked to ensure all springs were in place properly, again, checked behind the backing plate, normal wear on the brakes. Nothing else seemed odd. Drove the car and the noise was almost non-existant. After about a week of driving, the noise started to return, soft at first and grew louder by the day. Sad
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07-25-2011, 09:46 PM
Post: #4
RE: Grinding in rear wheel
Seeing as a backing plate does not bend by itself have you given thought to a wheel bearing that might be wearing and rubbing the drum on the backing plate?

Up and down play on a rear wheel bearing should be less than .010".... IOW, if you can feel the play it may be on the way out and gradually causing this problem. Bending the backing plate just bought you a bit of time on the noise but the bearing will continue to wear.
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08-01-2011, 01:23 PM
Post: #5
RE: Grinding in rear wheel
Thank you for your input. The wheel bearings were the first suspect for which was checked.
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08-02-2011, 09:16 AM
Post: #6
RE: Grinding in rear wheel
If you have not found the issue by now then you probably have overlooked something.

Does the noise change if someone rides in the back seat, going around a left or right turn, under braking or acceleration? Your original post said you heard on the left but took the right wheel apart. Maybe it's time to look at the left?
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08-04-2011, 11:46 AM (This post was last modified: 08-04-2011 11:49 AM by Germysquirt.)
Post: #7
RE: Grinding in rear wheel
We have checked both sides, sorry, not use to posting. The left was the first side checked. The noise does not change with passengers. We figure we are overlooking something but not certain what else to check. Rear wheel alignment did not change anything. Noise was heard before and after new brakes, new drums, new springs. Wheel has no play when testing for wheel bearings. We double checked to make certain all springs in right placement, no apparent malfunctioning springs or caliper. Regular wear on the brakes, both pads. Noise does not change with turning. Checked emergency brake. Out of ideas.
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08-04-2011, 08:51 PM
Post: #8
RE: Grinding in rear wheel
One thing I have seen a few times over the years is someone doing the brakes and the drums were not machined for the full width so as the shoe lining wears you get a rubbing / grinding where the drum hits on the very edge of the metal shoe backing. If you look closely at the drum where the friction surface meets the face of the drum, right in the corner, do you see a shiny spot? Perhaps it's more obvious on the shoe edge or maybe only on the drum due to disturbing the dust. The fix is to have someone machine the drums for the full width right to the edge.

Keep us posted on your progress as someone else may learn something.
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11-23-2011, 01:13 PM
Post: #9
RE: Grinding in rear wheel
Is it possible that the anti-lock modules, located on the fire wall, could be malfunctioning?
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11-23-2011, 09:17 PM
Post: #10
RE: Grinding in rear wheel
Anything is "Possible" but the EBCM malfunctioning wouldn't cause a noise in the rear wheels. If the EBCM does malfunction the system usually turns off and the ABS light comes on to let you know that you no longer have ABS.

I would find a secluded area where you could move the vehicle slowly while a helper walks along side listening. Once you determine which wheel is making the noise, try what I originally suggested. Pull that drum off, give it a light shot of spray paint, and reinstall it. Go for a short ride, using the brakes, & making sure you hear the noise. Pull the drum back off & look for where the paint is rubbed off.

Sorry I can't think of anything else.

Thanks for using the forum,
Garner

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