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2011 SEL unknown noise please help

222 Views 7 Replies 5 Participants Last post by  R.S.LOGAN
This sound has happened every now and then while driving for longer than an hour. It starts off quiet and gets louder before it goes quiet again and eventually stops. The whole ordeal lasts for about 10 minutes or so. Haven’t noticed any shimmying and it’s difficult to tell where the sound is actually coming from. It will stop only when you press on the brakes but will start up again once you let off and when accelerating. In the audio clip, you can hear when it stops during braking and how it keeps going as soon as you let off the brake. I took the sound recording during the loudest point of the noise and shortly after it stopped. Went on a trip 6 hours recently and it didn’t happen so it’s only happening sometimes. I’ve asked around no one is sure what’s happening. Any advice is helpful.
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The link doesn’t work. However since it goes away with application of brakes I’d check there first.
The link doesn’t work. However since it goes away with application of brakes I’d check there first.
I updated the link, should work now.
Unusual for a brake noise and normally would be there more often and consistently if so . You could strip down , clean out and lubricate the pads if you felt inclined . Could check air box , all hoses and intake , Alternator can make strange noises at odd times also , on all vehicles , likewise power steering or turbos / hoses , Strange it is only occasionally though

I think I would start with checking the brakes, being that stepping on the pedal quiets it.
Pad and rotor condition, along with making sure the caliper sliders are all working freely.

Another good idea would be to check the CV joints and boots as that sound can be consistent with one of them failing.

Another possibility may be a wheel bearing might be starting to go out.
One thing to keep in mind with bearings: just 'cause they have no slop doesn't mean they're not failing.
Often times the feel is different when turning the tire/wheel back and forth by hand, like maybe a light dry metallic feel on one going bad,
vs. a good one that doesn't and will be quiet.
It's also not always easy to tell so you have to play close attention, and the quieter the place you have for checking it, the better.
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When bearing starts to fail the bearing race gets worn and enlarged. Excess movement or play causes noise. When brakes are applied it puts pressure on the bearing holding it tight against the race and noise reduces or goes away until brake is released.
If a wheel bearing it should be there all the time , constant and not now and then . Also sound can change if steering wheel flicked and load transferred to that wheel . Most of the many bearings I've replaced were due to obvious wear on the ball bearings or tapered bearings in the race . Bearing noise usually starts at low speed and builds up to a constant drone
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