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Old 03-09-2014, 09:33 PM Thread Starter
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Steering Wheel Judder and Loud Knocking

Hi all.

Just picked up a cobalt today. Have been searching the forum for answers to my issue but nothing ive found really answers my query.
I have a horrid steering wheel shake and loud knocking from the drivers side wheel well when the brakes are applied. I know a warped brake disc can make the steering shake under braking but the fact it makes a loud noise has me concerned.
Actually feels like the caliper is gonna fly off!
I have checked to make sure caliper is actually ok but what else can I check?
Sorry if this is a usual boring q.
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Old 03-09-2014, 10:06 PM
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My guess would be the rotors, but I'm not 100%

I'm just curious, you just bought this today? Did you test drive it? Did you know it had this issue before you bought it? Did you buy it from a dealer?

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Old 03-10-2014, 11:32 AM Thread Starter
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I went and seen it on Saturday, drove it around car park. Then picked it up on sunday from private seller. Was told it had a wobble when braking at speed. It didn't cost me much so prepared for some maintenance. I just needed transport asap! Really like the car.
I might buy a cheap dial gauge to check for run out.
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Old 03-10-2014, 12:30 PM
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You will need to replace your rotors, turning them is pretty much useless cost wise.

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Old 03-10-2014, 01:48 PM
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Hey Craig,


Sorry to hear you are having this concern with your recent purchase. I see you are going to tackle this repair on your own. If you would like, I can check your VIN to verify you do not have a special coverage or recall. Please do not hesitate to reach out via private message.

Erica Tiffany
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Have you checked into Chevrolet Owner Center? You can maintain service history, check on warranty or recall information, and more. Visit my.chevrolet.com!
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Old 03-10-2014, 02:10 PM
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Welcome. I would agree to start with the rotors.


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Old 03-10-2014, 05:22 PM Thread Starter
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Hi. So its defo the rotors, and with further driving I have located the noise, its the steering column joint above the foot well. I can reach the joint and can feel play in the coupling, unless there's another joint beyond the bulk head, or maybe its the rack....
So changing rotors is quite easy, changing the column or whatever it is not so much I would think?
I will pm you ccs.

Last edited by cobaltcraig; 03-10-2014 at 06:59 PM.
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Old 03-10-2014, 10:02 PM Thread Starter
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i found this part whilst looking online

http://www.amazon.com/Genuine-GM-15800140-Steering-Shaft/dp/B00F66SES8
it has matching part number to the cobalt intermediate shaft, seems cheap enough.

also found 2 x disc and pad kit too at a very reasonable price.

Even if i do end up replacing non defective parts it'll be cheaper than a garage bill, and, i like getting my hands dirty...
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Old 03-13-2014, 06:59 AM
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For your steering problem is known as brake judder, basically your rotors are warped and/or glazed. If you really wanted to check on it, you would need to perform a lateral run out and it should not be .002" or greater on difference on sides. I would replace the rotors and pads to start off with and ensure when you get them to run a quick sandpaper down to prevent the shipping glaze that's on it.
For the right side sound by the wheel it can be wheel bearings giving out or missing a few. Could also be the pads are skipping the rotor as well. Hope this helps.

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Old 03-13-2014, 11:29 AM
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I did a pretty thorough write- up click here to view! on changing the rotors, pads, and caliper hardware . Including the part number for the rotor/pad combo I got from Rockauto for a low price. The intermediate shaft is a common problem with these cars since they are not serviceable, but you can tell for sure if you turn the steering wheel all the way to one side and apply the accelerator and the wheel doesnt straighten itself out.

Also, get the wheels balanced - if they are bent, they will make a lot of noise at speed, esp in combination with bad rotors. If you do, try to get the tech to use sticky weights or clip-ons on the outside of the rim. Some joker balanced mine with clip-on weights on the inner side and when the steering wheel is turned there is a loud BANG when the weight hits the lower strut mount.

Good luck, and welcome to "Throw parts at the Cobalt until the noise is gone!"

Last edited by alexxxx89; 03-13-2014 at 11:36 AM.
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