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Old 12-07-2008, 08:24 AM   #1
Mike Wevrick
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Question grinding noise in right rear when making sharp fast left turns

Like the title says, whenever I make a sharp fast left turn, I get a grinding noise from the right rear of the car. It sounds kind of like a brake pad dragging, and I do need new rear brakes, but it doesn't do it when braking or at any other time. The only other thing I can think of is a wheel bearing starting to go ie the turn is loading enough weight on the right rear wheel to make the bearing grind. Car has 55k on it, rear brakes and bearings are original (never touched) I recently swapped my snow tires onto it but I don't see how that could affect it unless I somehow bent something? Ideas?
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Old 12-07-2008, 10:26 AM   #2
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Top of the tire rubbing against the inside of the fender? But that would be pretty apparent...?
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Old 12-07-2008, 12:40 PM   #3
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^^No sign of rubbing. Plus its only on one side and it never happened in the 1st 2 winters with the same tires.

edit: Plus its a very metallic noise

Last edited by Mike Wevrick; 12-07-2008 at 01:08 PM.
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Old 12-07-2008, 01:26 PM   #4
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bearing
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Old 12-07-2008, 03:30 PM   #5
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^^That's what I'm thinking too. Any way to confirm? (I jacked that corner up and rotated/shook the wheel but it seemed fine.)
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Old 12-07-2008, 09:32 PM   #6
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To me it doesnt seem like a wheel bearing. when i read the OP i instantly thought tire rubbing. i have the same problem. wheel bearing usually are a more constant noise like you should be able to hear it going down the road. no offence but i would double check fro rubbing. try loading down your wagon and take some hard corners and see if it makes the same noise when making a right turn in the left rear. take the wheel and tire off and check to see if maybe your fender liner on one side may have fallen down a bit. look at the tire to for wear marks near like the lettering. and maybe some pics may help too.
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Old 12-07-2008, 11:13 PM   #7
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bad cv joint perhaps?
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Old 12-07-2008, 11:14 PM   #8
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Quote:
Originally Posted by Mike Wevrick View Post
Like the title says, whenever I make a sharp fast left turn, I get a grinding noise from the right rear of the car. It sounds kind of like a brake pad dragging, and I do need new rear brakes, but it doesn't do it when braking or at any other time. The only other thing I can think of is a wheel bearing starting to go ie the turn is loading enough weight on the right rear wheel to make the bearing grind. Car has 55k on it, rear brakes and bearings are original (never touched) I recently swapped my snow tires onto it but I don't see how that could affect it unless I somehow bent something? Ideas?
there ya go
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Old 12-08-2008, 09:38 AM   #9
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I agree with Scotty though his terse ass response leaves a little to be desired. Plus this cold weather doesn't help, hence you just hearing it now.
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Old 12-08-2008, 11:06 PM   #10
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^^Cold weather makes bearings worse? Never heard of that.
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Old 12-08-2008, 11:17 PM   #11
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Quote:
Originally Posted by Mike Wevrick View Post
^^Cold weather makes bearings worse? Never heard of that.
well.....temperature extremes will often make progressive issues accelerate

cold grease is stiffer and can accelerate wear issues
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Old 12-09-2008, 09:54 AM   #12
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Can you physically see if you need a new wheel bearing by jacking up the car and putting force on the rim in different directions to see if there's movement? I've done that on other cars and felt play, knowing it was the bearing, but wondered if it was always like that.
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Old 12-09-2008, 11:17 AM   #13
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Quote:
Originally Posted by Metallrulz View Post
Can you physically see if you need a new wheel bearing by jacking up the car and putting force on the rim in different directions to see if there's movement? I've done that on other cars and felt play, knowing it was the bearing, but wondered if it was always like that.

this is NOT always true....but keeps getting posted

you can NOT always tell if bearings are bad in this manner

sound while driving is usually the first indicator of a bad bearing
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Old 01-05-2009, 04:38 PM   #14
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^^Yup; I think that method worked for older bearings but the newer ones can have no play and still be shot.

Update: I finally took it in and it wasn't a bearing. It was the backing plate rubbing on the rotor, which was badly rusted. It needed new rear brakes soon anyway, so I am having them done. First major work on the car in 55k, so I can't complain.
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Old 01-05-2009, 04:39 PM   #15
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^^Yup; I think that method worked for older bearings but the newer ones can have no play and still be shot.

Update: I finally took it in and it wasn't a bearing. It was the backing plate rubbing on the rotor, which was badly rusted. It needed new rear brakes soon anyway, so I am having them done. First major work on the car in 55k, so I can't complain.
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Old 01-05-2009, 04:50 PM   #16
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A long time ago, a Subaru mechanic told me about the backplate issue. Rather common. So they fix and/or prevent the issue when they do a brake job.

I do my own brake jobs, but I share maintenance experience with the owner of the shop. Plus, I give him business when he can handle work more efficiently than I can.

I didn't respond to this thread since I didn't want to be told it was a wheel bearing, which it might have been. Remote diagnosis is always kind of iffy.
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Old 01-05-2009, 05:25 PM   #17
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Hmm, I have had the same problem with my wrx. I'm glad I saw this post!!
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Old 07-20-2009, 10:35 AM   #18
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I just had the rotors and pads done by a friend on my MY02 WRX and I'm having this problem as well. My rear bearings were replaced less than a month ago by Subaru so I thought it had to be a brake issue... Any ideas on how to fix the plate issue? Does it need to be taken into the dealer or can it be done myself?
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Old 07-20-2009, 12:02 PM   #19
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The Subaru mechanic just grinds the little bit of corrosion off the rotor edge as a trick of the trade when he does a brake job. I do my own brake work, and save his work for the more difficult stuff.
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Old 07-20-2009, 01:30 PM   #20
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Default What solved the problem for me

Take the rear wheel off.
Take the caliper and rotor off.
Now take a good look at the most bottom part of the park break plate. There is a spot on this plate right between the lower ends of park break shoes where it got bent outwards. You should be able to see shinny metal on that spot resulting from grinding.
What I did to fix it was punching the spot a few times with a chisel and a hammer.
No more grind while taking a sharp turn.
Hope it helps
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Old 07-21-2009, 09:35 PM   #21
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on my car, my friend who did my brakes had to grind down the metal plate behind the rear rotor because it was rusted. It started grinding right after i got new brakes and rotors. Started right after he did the job.
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Old 09-20-2009, 09:18 PM   #22
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Default Same problem, and a solution.

I had the same problem which developed gradually, without installing new pads, rotors, or any other changes that I'm aware of. So I used Dremel to remove some of the backing plate around the scraping mark (bottom of backing plate). The backing plate is fairly thick (~4mm - double layer) and I removed less than 1mm. I also filed away a little bit of the rotor extrusion that was scraping the backing plate. Scraping sound is gone now. Thanks to the other posts and my brother-in-law who pointed me to this thread.
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Old 09-24-2009, 03:01 PM   #23
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I posted something about this a couple years back and no one mentioned it being a common issue with Subarus.

Good to know.
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Old 09-28-2009, 02:28 AM   #24
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Thanks a lot : All of you. I started to have the same problem : When I make a sharp left turn , it sounds like brake pads are gone , I took both rear brake pads off and clean them, at 83k they are about 50% left and still OK , but the sound is still there , I know it should not be bearings or cv because if I drive straight nothing happens , only when I make a turn . I never thought about that . This weekend I am going to take the rotors off and see what happen
This is a great forum I learn a lot .
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Old 09-29-2009, 02:51 PM   #25
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I'm having the same issue currently. Now I'm hoping that it's just that backing plate rubbing.

If it is a bad bearing, how hard would that be to fix in my driveway? Possible? Easy, even? I've done swaybars, lateral links, etc. in my driveway. I'm good with a wrench. Anyone that's replaced a bearing, please chime in!

Thanks.

And, yeah, this place is a great resource. Been here awhile now and I still love it.
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