**Resolved** Weird intermittent humming noise... - Page 3 - Saturn Outlook Online Community
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post #21 of 40 (permalink) Old 03-17-2011, 11:53 PM Thread Starter
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Re: Weird intermittent humming noise...

Quote:
Originally Posted by AA/78U
bloc

what is the outdoor adventure package as listed in your signature?
Running boards, roof rack cross rails, and a rubber cargo mat. Not a package that I was looking for, but came with the holdover they found for me. I'm glad I have it, though.

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post #22 of 40 (permalink) Old 03-25-2011, 09:40 PM Thread Starter
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**Update** Weird intermittent humming noise...


So, I think I have it narrowed down to the parking brake. I was opening my door when I got home tonight, and when that motion rocked the car, I heard a squeak coming from the left rear well. I got out and pushed on the car to rock it back and forth, and it continued to make the noise. However, it does not make the noise when I have the parking brake set. Even if it's just one click down on the pedal. I can still rock the car with the brake set as I could without it set.

Could something be sticking in there? Could it come and go? Are the parking brakes only on the rear, and are they a separate brake? Want to get some info before I decide to take the tire off.

-SOLD- 2008 Outlook XE AWD<br />Carbon Flash/black cloth<br />Conv Pkg/Pref Pkg/Sunroof<br />Outdoor Adv Pkg/Tow Pkg
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post #23 of 40 (permalink) Old 03-25-2011, 09:53 PM
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Re: **Update** Weird intermittent humming noise...

Parking brakes only in the rear, should not be seperate brake but a cable running to the caliper, it could stick but you won't be able to tell until you pull the wheel. Sounds like a warped rotor, with the brake set the caliper cannot move as much and the squeak goes away.

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post #24 of 40 (permalink) Old 03-26-2011, 12:14 AM
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Re: **Update** Weird intermittent humming noise...

Quote:
Originally Posted by lsuduke
Parking brakes only in the rear, should not be seperate break but a cable running to the caliper, it could stick but you won't be able to tell until you pull the wheel. Sounds like a warped rotor, with the brake set the caliper cannot move as much and the squeak goes away.
Probably not. The parts manual lists parking brake shoes. On some vehicles now they have "shoes" that work inside the back of the rotor to enable the parking brake, kind of like the old drum brake concept.
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post #25 of 40 (permalink) Old 03-26-2011, 10:46 AM
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Re: **Update** Weird intermittent humming noise...

Thanks for the correction, haven't had a look at them , haven't gotten my service manual yet

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post #26 of 40 (permalink) Old 03-26-2011, 12:35 PM
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Re: **Update** Weird intermittent humming noise...

Quote:
Originally Posted by lsuduke
Thanks for the correction, haven't had a look at them , haven't gotten my service manual yet
Yes, parking brake shoes contact the inside of the rear brake disc when engaged via cables. If the cable is hanging up, due to lack of use, the shoes could be dragging on the inside of the drum. Rubbing the brake disc could cause the humming noise.


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post #27 of 40 (permalink) Old 03-27-2011, 11:43 AM Thread Starter
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Re: **Update** Weird intermittent humming noise...

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Originally Posted by XRDreamliner
Yes, parking brake shoes contact the inside of the rear brake disc when engaged via cables. If the cable is hanging up, due to lack of use, the shoes could be dragging on the inside of the drum. Rubbing the brake disc could cause the humming noise.

This makes sense, although when I slightly engaged the parking brake while moving, the humming noise did not go away.

How would I loosen up the cable?

-SOLD- 2008 Outlook XE AWD<br />Carbon Flash/black cloth<br />Conv Pkg/Pref Pkg/Sunroof<br />Outdoor Adv Pkg/Tow Pkg
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post #28 of 40 (permalink) Old 03-27-2011, 04:24 PM
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Re: **Update** Weird intermittent humming noise...

Quote:
Originally Posted by bloc0102
This makes sense, although when I slightly engaged the parking brake while moving, the humming noise did not go away.
Hmmm... then I wouldn't adjust the parking brake if the noise didn't subside... this is one of those problems.

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post #29 of 40 (permalink) Old 04-04-2011, 09:22 AM Thread Starter
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Re: **Update** Weird intermittent humming noise...


Okay, so I finally was able to get it down to my dad's shop so my brother could take a good look at everything. Popped the left rear wheel off and could notice that something was dragging a little bit. Not enough to be overly concerned with, though. Tried taking the heat shield off to get a look in the rotor, but could not get the nuts off even with a 400 ft lb impact... So, we knocked the rotor with a hammer, and holy cow did a lot of rust fall out. Sprayed everything down with brake cleaner and hopefully that'll help solve the problem!

Just to clarify, the parking break is inside the rotor and not part of the brake pad assembly, correct?

When turning the axle back and forth, we could hear the squeak I was talking about in an earlier post, and it sounds like it's coming from the drive axle just forward of the transfer case. Reason to be concerned?

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post #30 of 40 (permalink) Old 04-04-2011, 10:36 PM
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Re: **Update** Weird intermittent humming noise...

Quote:
Originally Posted by bloc0102

Just to clarify, the parking break is inside the rotor and not part of the brake pad assembly, correct?

When turning the axle back and forth, we could hear the squeak I was talking about in an earlier post, and it sounds like it's coming from the drive axle just forward of the transfer case. Reason to be concerned?
Yes, the parking brake shoes are inside the rear brake rotor.

Well. a squeak coming from the drive-line assembly is not a good sign. According to the service manual, the unit contains the AWD clutch assy, including bearings, and the the drive-line assembly is not a serviceable item. If you haven't already, it may be worthwhile to have the rear differential fluid changed, just to see if a fluid change effects anything. Otherwise, I would suggest you take it to the dealer, raise it on the lift, and have them verify the squeak noise. This part should be covered under the 5 yr/100k powertrain warranty.

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