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06-05-2013, 05:54 PM | #1 |
Scooby Guru
Member#: 117767
Join Date: Jun 2006
Chapter/Region:
RMIC
Location: Denver, CO
Vehicle:2014 Audi S4 DP Stage 2 (~420whp) |
Rubbing/scraping noise from rear wheel or brakes.
I cannot seem to find a solid answer for the problem I'm experiencing so I figured I'd post.
When I am slowly accelerating from a stop or coasting at low speeds (5-15mph) there is a rubbing noise coming from what appears to be the rear right side of the car. The noise has gotten noticeably louder over the past 5k miles or so. It also only happens when the brakes are NOT applied. If the rubbing/scraping noise is occurring, gently stepping on the brakes stops the noise. As soon as I let off the brakes the noise comes back. The noise also occurs just the same whether I'm going straight or turning. Initially I thought it was my brake pads. However, I recently (within the last 500 miles) replaced my brake pads with new Hawk HPS pads. Since doing this the noise has remained consistent to how it was before the brake pad change. I'm pretty stumped right now and wanted to post to see if anyone had any insight on the issue. I did a little research and came across a couple threads saying that it might be a bent dust shield rubbing against the rotor. However, this wouldn't explain why the scraping noise goes away as soon as I touch the brakes, would it? Any ideas?
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06-05-2013, 06:28 PM | #2 |
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South East
Location: Charlotte, NC
Vehicle:15 Outback, 15 WRX 6MT CWP |
i came in with the dust shield suggestion, but...
can you put it up on jackstands and stick it in gear? |
06-05-2013, 06:39 PM | #3 |
Scooby Guru
Member#: 117767
Join Date: Jun 2006
Chapter/Region:
RMIC
Location: Denver, CO
Vehicle:2014 Audi S4 DP Stage 2 (~420whp) |
I can do that. What would I be looking for?
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06-05-2013, 07:54 PM | #4 |
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TXIC
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Vehicle:2006 STi Obsidian Black Pearl |
I remember reading this would happen if the pads were installed backwards, seemed to be a common issue with the dealer. Hope this helps.
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06-05-2013, 10:12 PM | #5 |
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Location: Chicago
Vehicle:2007 WRX 2015 SQ5 |
Although you car isn't that old it is very common for the backing plates to rust. The rust pushes the lip of plate for the ebrake assembly into the groove on the rotor. Take off the rotor and look for shiny spot where the inner diameter of the rotor contacts the backing plate.
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06-05-2013, 11:42 PM | #6 | |
Scooby Guru
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Join Date: Jun 2006
Chapter/Region:
RMIC
Location: Denver, CO
Vehicle:2014 Audi S4 DP Stage 2 (~420whp) |
Quote:
This weekend I'll get the car on the lift and start digging around. I'm hoping it's something simply like the dust plate. |
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06-19-2013, 11:46 PM | #7 |
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It wouldn't be hard to find out if its the dust plate. You would be able to see where its rubbing, look for fresh metal on the plate. If there is,they are very easy to bend back or "adjust" to where it wouldn't rub/hit (if that is the problem). Process of elimination one step at a time.
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06-20-2013, 05:36 AM | #8 |
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Sounds like the dust plate but check all the bolts on the brakes/suspension on the suspect area.
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06-20-2013, 09:49 AM | #9 |
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Drive 10 mph and pull on the hand brake. Does the noise go away?
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06-20-2013, 10:47 AM | #10 |
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Vehicle:2003 WRX |
Did you check the sliding pins are not stuck?
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06-21-2013, 11:14 PM | #11 | |
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Quote:
Pull the rotor and look, its easy.. |
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08-27-2018, 05:21 PM | #12 |
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08-28-2018, 08:31 AM | #13 |
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09-10-2018, 09:07 PM | #14 |
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09-22-2018, 12:41 AM | #15 |
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Same here, but noise is only there during cornering. Pads look good so rotors are coming off tomorrow. Ill post what I find. Its gotta be something with my p brake.
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09-22-2018, 09:16 AM | #16 |
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09-22-2018, 03:41 PM | #17 |
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That thought came to mind, but I sorta expect the bearings to be singing if they are that bad off. I'm not getting to it today, but I'll give it a wiggle tomorrow before I look at the P brakes.
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09-23-2018, 09:38 PM | #18 |
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Bearings have no play, so I pulled the rotors off. There was a small spot that showed contact just under the adjuster and the lip on the rotor that fits into the dust shield (I'll have to figure out how to post pics). Just thinking about the geometry there (i.e. The only way that gap can close when loaded in a turn), the only pivot point is the bearing. Turning the hub against the backlash in the rear diff seems easier than with a good "stiff" bearing. I hate throwing parts at a problem to diagnose them, but as much as it goes against my experiences of bad wheel bearings, I can't see this being any thing else...in my case anyway.
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09-23-2018, 11:02 PM | #19 | |
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Just my opinion. |
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10-08-2019, 11:15 AM | #20 |
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10-08-2019, 02:11 PM | #21 |
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Are you rear (main) brakes making noise when you engage the parking brake? I think I'd have to see the scenario. If you hear a noise when you're rolling and engage the parking brake, it sort of depends on the noise. If you hear grinding or metal on metal with the brake engaged, your parking brake shoes are likely just worn.
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10-30-2019, 11:21 AM | #22 | |
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Quote:
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08-29-2021, 04:43 PM | #23 |
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Dealt with this issue. Punished the emergency brake backing plate with the grinder, no more noise!
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08-30-2021, 02:24 AM | #24 |
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Haha. Thats funny I'd forgotten about this thread. I'm finally getting the parts for the H6 upgrade and will be grinding the same spot in the process. Glad to hear that got rid of the noise for you.
Last edited by 998Pilot; 08-30-2021 at 05:42 PM. |
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