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post #1 of 13 (permalink) Old 08-01-2014, 07:56 PM Thread Starter
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New Rotors - Sounds Like Airplane Now

2007 Cobalt LT, 5spd.

My brother (a real mechanic) replaced the pads and front rotors on my son's car today. He used ceramic pads (pro stops from Pep Boys) and "best" rotors from Advanced Auto (we were looking for "coated", but gave up). The rotors are Bendix from China.

Everything went smooth and we drove it around the block and it stops fine. No shudder, no noise, all good.

Get on the road heading home and above 25 MPH, the car begins to sound like you're sitting in the cockpit of an airplane. There is also some resonance.

The car has fresh tires and was very smooth and quiet up until today.

Is it the pads or the rotors that might be causing this?

Thanks!
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post #2 of 13 (permalink) Old 08-01-2014, 08:01 PM
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When you say it sounds like an airplane do you mean it sounds like wind is passing through something?

I had a sound like that once but it was nothing to do with brakes. behind the pedals there was a rubber gromet that had worked its way loose and sounded like a wind tunnel when I would get over 15 MPH.... just a thought.

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post #3 of 13 (permalink) Old 08-01-2014, 08:20 PM Thread Starter
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No, it sounds like you are in a single engine airplane. It is speed related only, put the car in neutral and coast -- the noise continues. It lessens as you slow down and stops below 25 MPH.
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post #4 of 13 (permalink) Old 08-01-2014, 08:29 PM
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Like a single prop airplane????

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post #5 of 13 (permalink) Old 08-01-2014, 08:37 PM
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Did he have to use a ball peen hammer to remove the old rotors? If yes he might have damaged a wheel bearing. Or if you got drilled rotors they can be noisy at first until the ridges are wore off.

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Last edited by Coby7; 08-03-2014 at 08:33 AM.
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post #6 of 13 (permalink) Old 08-02-2014, 05:31 AM Thread Starter
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Did he have to use a ball peen hammer to remove the old rotors? If yes he might have damaged a wheel bearing. Or if you got drilled rotors they can be noisy at first until the ridges are wore off.
Rotors are not drilled or slotted. He did use a hammer, but only tapped the old rotors free. He's done lots of brake jobs, I don't believe he did any damage.

I found a similar thread here and someone mentioned the pads should be "chamfered"? There was no follow up post and am wondering if that might be the fix.

Last edited by Coby7; 08-03-2014 at 08:33 AM.
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post #7 of 13 (permalink) Old 08-02-2014, 05:47 AM
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Get your bro back to correct the issue...otherwise it's time to head to your local brake shop. Either way they have to be re-worked.

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post #8 of 13 (permalink) Old 08-02-2014, 05:55 AM
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Bevelling the pads is usually done to eliminate high pitch squeals. Try steering side to side on a straight road to see if noise changes. If it does it's a wheel bearing, coincidences do happen. Lifting the car and taking the pressure of the bearing that is about to let go and tapping with a hammer then dropping the car can push a wheel bearing to finally fail. I'm not blaming your brother here I'm just saying this happens. Sometimes upper strut bearings will be damaged just by lifting the car off the ground. If it sounds like your sitting in the back of a plane chances are you lost a wheel bearing in the process.

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post #9 of 13 (permalink) Old 08-03-2014, 07:44 AM Thread Starter
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Bevelling the pads is usually done to eliminate high pitch squeals. Try steering side to side on a straight road to see if noise changes. If it does it's a wheel bearing, coincidences do happen. Lifting the car and taking the pressure of the bearing that is about to let go and tapping with a hammer then dropping the car can push a wheel bearing to finally fail. I'm not blaming your brother here I'm just saying this happens. Sometimes upper strut bearings will be damaged just by lifting the car off the ground. If it sounds like your sitting in the back of a plane chances are you lost a wheel bearing in the process.
Took the car back to my brother yesterday. It turns out the passenger side hub assembly needed to be replaced - so you were on the money!

Funny thing is, he only used a hammer on the driver's side.

Put the Moog replacement part on there and it's all back to normal. Thanks for the help and advise.
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post #10 of 13 (permalink) Old 08-03-2014, 08:36 AM
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Like I said sometimes just lifting the wheel off the ground and back down will finish a wheel bearing that is about to fail.

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