Elantra Rear Thumping Sound When Braking - Hyundai Forums : Hyundai Forum
 
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#1 Old 01-29-2011, 11:43 PM
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dem0nk1d
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My wife's 2000 Elantra is making a strange thumping sound in the rear passenger side of the car when the brakes are applied. I've thought it was something internally in the drum brake assembly but did not find any kind of damage. Any how being that the car is 12 years old and the rear drums have not been replaced, I replaced everything from new pads, to drums. Then I went for a test ride and the sound did not go away. So somewhere on the internet i read that it's possible to be the rear sway bar bushings. The actual bushings look fine, but the swaybar link that goes from the sway-bar to the strut/shock, looks like the ball joints have lost motion. So thinking that this maybe where the sound is coming from i detached the end-link, and drove the car around the block. Now i'm still have a thumping sound. So gents I'm out of ideas...
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#2 Old 01-30-2011, 09:39 AM
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Could be wheel bearings.

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#3 Old 01-30-2011, 09:50 PM
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dem0nk1d
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QUOTE (wymi @ Jan 30 2011, 06:39 AM)
Quote:


Could be wheel bearings.

Sounds possible, is there any test i can preform on the car to pin point if it is the wheel bearing. shouldn't the wire should some kind of play going side to side. You know what I mean... Also is there any write ups on the replacement?

I found this, but sounds like the guy is talking about rear disc brake setups.
http://www.hyundai-forums.com/t38622-re-re...replacement.htm

Also is there a factory service manual for download that I should be aware about.

This is my first rodeo, i'm a honda guy by trade.
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#4 Old 01-30-2011, 09:54 PM
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QUOTE (dem0nk1d @ Jan 30 2011, 08:50 PM)
Quote:
Sounds possible, is there any test i can preform on the car to pin point if it is the wheel bearing. shouldn't the wire should some kind of play going side to side. You know what I mean... Also is there any write ups on the replacement?

I found this, but sounds like the guy is talking about rear disc brake setups.
http://www.hyundai-forums.com/t38622-re-re...replacement.htm

Also is there a factory service manual for download that I should be aware about.

This is my first rodeo, i'm a honda guy by trade.
You should check out www.hmaservice.com it's free to sign up and download information.

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#5 Old 02-01-2011, 04:49 AM
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EdGasket
You could also order a Haynes Elantra manual from somewhere like Amazon; very good !
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#6 Old 12-06-2011, 10:46 AM
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Smile Brake thumping (clickng) soloution for sure:

The problem is caused by the wheel bolts being a little bit too long. The wheel nuts on some models are "closed", meaning that the threaded hole in the nut does not go all the way through. Thus one or more of the nuts will bottom out on the bolt BEFORE the hub is completely secured to the wheel. When this happens, the hub, being a little bit loose, can wobble during braking, which makes the noise. I just discovered this last week on my wife's 2001 Elantra, which has intermittantly had the problem since new. I have placed a call to the dealer to find out if Hyundai has a fix. If not, I plan to grind off a few thousandths from each wheel bolt.

If you want to prove this for your own satisfaction, use a manual torque wrench and slowly tighten each wheel nut. On some of them you will notice a sudden change in the feel of the torque wrench when the nut bottoms out. On a wheel that makes the noise, you may actually be able to feel the "loose" hub and manually reproduce the sound by jacking up the car and applying opposite in/out motion to the top and bottom of the tire with your hands.
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#7 Old 12-06-2011, 12:07 PM
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Updating my own message: In original message, replace the word HUB with BRAKE DRUM. Sorry, I chose the wrong word.

Also, there is one phillips screw that holds the brake drum against the wheel hub. If this screw is present, the thumping sound may not happen even though the drum is not properly seated against the hub. In my case, the driver side screw was missing, probably left out during an inspection procedure. Thus the wheel exhibited the problem. Fun, eh?
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