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Old 02-10-2019, 08:19 PM   #1 (permalink)
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Default Loud rear brake noise

I have scraping noise coming from the rear wheels when I brake, sometimes it goes away completely, but I'd say it's there 90% of the time. Sounds like the rear shoes are worn out, but they are not. They look to have 80% left on them. No build up or crap in the drums, nice and smooth. I can't understand what is causing the scraping noise. Super annoying. I'd like to figure it out so I can eliminate it.

Car has about 55k miles on it. Are there other parts that could be making this noise that can be replaced?
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Old 02-10-2019, 09:45 PM   #2 (permalink)
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The only thing I can think of is that the shoe might have shifted left/right enought to touch the shoe side on the drum. Take it apart and look for odd signs of polishing on shoe edge or strange places on drum.
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Old 02-10-2019, 10:14 PM   #3 (permalink)
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Change the rear brake cylinder on that side,,it's sticking and not pulling the shoe back.
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Old 02-11-2019, 08:28 PM   #4 (permalink)
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the noise is on both sides... grinding when the brakes are engaged. Press on the brake pedal, get a grinding noise. It's loud. But goes away when you take your foot off the pedal. Brakes are disengaging just fine.

Are the backing plates an issue? Maybe rust build up, and shoes pressing into the backing plate when brakes engaged? They work fine, they're just grinding and loud.
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Old 02-11-2019, 08:45 PM   #5 (permalink)
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Find yourself a big vacant parking lot. Put the car in reverse, speed to at least 15 MPH, slam on the brakes and hold till you stop. Drive forward and test for stopping and noise.
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Old 02-12-2019, 09:11 PM   #6 (permalink)
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What exactly will backing the car up at speed accomplish? Not understanding...
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Old 02-13-2019, 07:23 PM   #7 (permalink)
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Drum brakes tyically have a self adjustment mechanism that takes up the slack from wear, but the adjustment only happens when the brakes are applied while going backward, and may not occur if it isn't fast enough. It doesn't mean you need to go 30 mph, but not at a crawl.
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Old 02-13-2019, 08:00 PM   #8 (permalink)
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Also, I believe the adjusters can only make up for a certain amount of slack with each backwards brake application, so if a lot of slack in needed to be taken up, then several applications might be needed. It doesn't sound to me like this is the nature of your problem though.
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Old 02-13-2019, 08:36 PM   #9 (permalink)
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When did the noise start and did you change the drums or shoes?
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Old 03-05-2019, 08:19 PM   #10 (permalink)
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Quote:
Originally Posted by jime View Post
When did the noise start and did you change the drums or shoes?
hey, looks like I missed this.

The noise started months ago. I've had 2 different shops look at the rear brakes, they both said they're fine. One even said they look to have 90%-95% left on the shoes. I have new shoes, asked the shop to replace them, but they wouldn't . Said it's not the issue. I wish they'd drive the damm car and see how loud the noise is. Something is definitely grinding back there when I use the brakes!
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