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Old 09-09-2008, 08:57 PM   #51
yohy
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Here we go again. I posted a couple weeks ago with regards to my '97 Legacy experiencing the "new rotor grinding against the backing plate" issue. Well the car that just replaced the '97 is a '03 Impreza RS with 50K on it. I did a complete brake job, pads/rotors/hardware on the '03, the fronts went fine, no problems at all. On to the rears, no problems with the removal or install. Take it out for a test drive and on the first left hand turn I get the dreaded grinding noise, right hand turn, no problem...just the left. Back into the garage, up on jack stands, pull the right side apart and bingo, the shiny spot on the bottom of the backing plate. At least now I know what to do..grab the Rotozip with a grinding wheel on it, a few passes around the "wear" spot. Re-assemble that side, back out on the road...and silence.

So thanks to all that have posted on this thread. The first time I experienced it I freaked out wondering what the heck I did wrong. This time I was prepared and it took about a minute to correct the issue.
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Old 09-10-2008, 08:30 PM   #52
ScoobySnacker
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Well i finally got around to tearing it apart and it seems like this will be my problem. Now on to the pictures:

Backing Plate:



Rotor (notice the glossy ring):



After cutting a little:



I havn't been out to see if this fixed the problem but i bet it will. I will post back once i take it for a drive...
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Old 09-17-2008, 08:41 AM   #53
sunfps
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Well this sounds like the same issue I'm having. Thursday will be nice here and I think I'll be doing some investigating.
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Old 09-23-2008, 02:36 PM   #54
fatgroundhog
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Great thread. Replaced the rotors Sunday, problem showed up today. Just glad it ain't the bearings.
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Old 11-06-2008, 07:57 PM   #55
atenzany62
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bump for this thread and post #36!! been having this problem with stock wheels, stock worn rotors.. got 17" wheels and just installed new powerslot rotors... still hear the grinding sound. hopefully my friend can have the time to check on the rear brakes tomorrow
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Old 11-13-2008, 10:10 PM   #56
atenzany62
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grinded out both sides on the backing plate. polished all the rust off too. NO MORE GRINDING when i turn WOOOT!!!
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Old 02-19-2009, 06:51 PM   #57
mzdrati
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I'm glad I could help with my write up. God knows I owe this community something of value, after all of the great tips and advice I've gotten from this site over the years. Subaru should issue a recall on this issue, but since it takes a few years to show up, I'm guessing the cars that are affected are mostly out of warranty, so the owners have to foot the bill for the (simple) repair.
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Old 02-23-2009, 09:21 PM   #58
CTman
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1st post and total sub noob
After test driving my 2002 rs before the purchase and noticing horrible rear brakes I had the garage replace them before the sale. A few days later after picking up the car(tonight actually) I'm driving home with the wife following just in case and I hear this exact grinding sound. Sounded just like bare rotors on spent pads but ony while turning hard and slow. I was pissed but finished the trip home. Thank you hardily for easing my mind. The dremmel will be whipped out in the near future.
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Old 02-24-2009, 05:15 PM   #59
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I had this happen recently also. I replaced all four knuckle and hub assemblies with new bearings and seal. I got it all back together and on the first right turn, the driver rear wheel made the scraping noise.

I took the wheel off and couldn't see any major markings. I asked a friend who is a mechanic about it and he said to check the backing plate. Sure enough i saw the clean scrape mark.

I took a large flat tipped punch and tapped around the area. Made sure i didn't warp any other parts of the plate and reinstalled everything. No more sound. I wish i saw this thread first cause i would have fixed it the night it happened, not the next weekend.
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Old 03-01-2009, 09:43 PM   #60
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Great thread. Time to break out the die grinder.

Stock rotors didn't make the sound, but the replacement one does (passenger rear). Annoying. I hate brake work as it is.
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Old 03-02-2009, 03:10 PM   #61
REX8
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Quote:
Originally Posted by ciper View Post
Did you not read post number 36?
And actually, post 25 was in well before that even...
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Old 05-16-2009, 08:15 PM   #62
CEGLEX
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Thanks to everyone who has added tips to this thread through the months. I bought an 03 WRX four months ago, and a persistent rubbing noise had gotten worse and worse on the passenger rear side each time I took a hard left turn.

Today, while doing other maintenance, I decided to take the wheel, caliper, and rotor off to check it out. Sure enough, the inner backing plate had a very clear (silver/metal) worn spot at about the six o'clock position, about an inch long. And the back inner edge of the rotor was worn bright silver as well from the contact. I got out my Dremmel, ground the metal down on the backing plate in the zone where it was making contact, and bingo, the problem is gone. Now I know what expect if it surfaces again on any wheel.

For those who want to take this quick fix on, just be sure you have some sturdy grinding wheels on hand for your rotary tool, as the backing plate metal will work them over. I've read of other "fixes" like hammering or bending the backing plate, but I wanted to "sculpt" it a little more.

Once again, thanks NASIOC and Scoobymods!!!!! I've been able to do so much on my own with this car. I haven't had a dealership or repair shop do anything other than mount new tires and do an alignment.
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Old 05-16-2009, 08:51 PM   #63
ranger5oh
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I think this is the problem I am having! Halleluleah! I replaced my rotors today, and blammo.... grinding noise from left rear when I make right turns, and no noise any other time.

Thanks to everyone who has posted on this thread... I think this just saved me a trip to the stealership. Im gonna check it out tomorrow evening.
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Old 05-16-2009, 09:28 PM   #64
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Just replace my pads and rotors today and I have a grinding noise when I turn left but on seems to be at a low speed when i dont press on the break. At a higher speed I dont hear it. If I brake then turn right i dont hear it either. I installed Stop Tech rotors and Endless Vita pads.
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Old 05-16-2009, 09:32 PM   #65
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Quote:
Originally Posted by Sonnyblk View Post
Just replace my pads and rotors today and I have a grinding noise when I turn left but on seems to be at a low speed when i dont press on the break. At a higher speed I dont hear it. If I brake then turn right i dont hear it either. I installed Stop Tech rotors and Endless Vita pads.
Yep - take the rotor off and look closely at the backing plate. If that is the problem, the freshly rubbed metal will be obvious - bright silver. On your new rotors it might be harder to see. The rubbing I had was also at slower to moderate speeds, and when I was NOT braking. Simply a pronounced turn caused the noise. Check it out - I hope this is what you are experiencing because it is a pretty easy fix.
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Old 05-16-2009, 09:37 PM   #66
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^^^ Thanks will do tommaro how much should it be bent back i have dremmel tool but if the chisel and hammer is better i will use that.
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Old 05-16-2009, 09:50 PM   #67
CEGLEX
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Quote:
Originally Posted by Sonnyblk View Post
^^^ Thanks will do tommaro how much should it be bent back i have dremmel tool but if the chisel and hammer is better i will use that.
I didn't bend mine; I just used a few different Dremmel grinding heads to get the job done. I took my time and made everything nice and smooth. Don't rush it if you are grinding or you will destroy the Dremmel. Let us know what you find when you pull the rotor and whether or not this is the fix for you. Good luck!
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Old 05-17-2009, 10:13 AM   #68
sunfps
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I replaced the rotor and pads about 3 weeks ago. I also grinded down the backing plate. The noise is back though, not as persistent as before, but still apparent.

I'm not sure what else to do. Take everything off again and grind more?
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Old 05-17-2009, 10:54 AM   #69
BIGSKYWRX
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see if there is still evidence of rubbing (likely) and if so remove more
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Old 05-17-2009, 03:28 PM   #70
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I've ground mine down a couple times now since I swapped rotors and the noise has decreased quite a bit. Just a bit more to go I suppose...
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Old 05-18-2009, 12:43 PM   #71
discounteggroll
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anyone in the CT/NY area want to assist me with this? I put new rotors in yesterday and get a grinding noise at low-speed right hand turns.

brake work gives me the chills and if someone who can provide a hand and their knowledge would be great.
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Old 05-18-2009, 12:55 PM   #72
yohy
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discounteggroll, if you just did rotors, you can fix this problem. Read through the posts and you will find many ways to attack the problem, most just grind the spot where the "rubbing" occurs. If it happens on a slow right hand turn, I would start with the left side (that side will load up on a right turn). Pull the rotor and I'll bet you will see a shiny rub spot on the backing plate at the 6 o'clock position. File, grind, sand that spot, reassemble and the noise will be gone.

You can do it, really. I had the problem first on my '97, thought somehow I had screwed up a wheel bearing. After pulling the rotors off TWICE, I finally saw the spot that was rubbing. It was only after that I found this thread and realized just how common an issue it was. So when it happened on my '03, I knew exactly what it was and how to fix it.
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Old 05-28-2009, 10:30 AM   #73
SleepyWeasel
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Default i hope this is it!

Wow this looks like this could be the problem I'm having!

Thank you to rexfan and viper74656 for pointing me here.

Gonna check it out right now and see if there is contact/rubbing.
Will update afterward!
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Old 05-28-2009, 01:41 PM   #74
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I had the same problem occur after an Autox even this weekend. I have been looking for every possible thing that it could be besides the wheel bearing and sure enough when I pulled the rotor off I had the same wear issue, time to get the cut off wheels.
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Old 05-28-2009, 11:41 PM   #75
Badmunky
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I'll be pulling mine apart to check them tomarrow as I think I am having this problem. I have been trying to find a growling sound coming from the rear brakes for 2 months.

15K on the car and 2 winters so far.

Ill post back with what I find.
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