Groaning noise after rear brembo install

[terryscott621]

Ok guys, here's what I did after I got home:

1) Checked parking brake adjustment. I could spin the wheel and I could also hear the rotor dragging against the parking shoes. Pulled the parking brake handle up inside the car and couldn't turn the wheels at all. So I feel that the tech at Pepboys adjusted the parking brake correctly.
2) Torqued all four caliper mounting bolts to 88ft lbs. They were not torqued to spec after Pepboys was done adjusting my parking brake.
3) I had my wife put the car in drive then press and release the brake to simulate coming to a complete stop. I made a video of the driver's side rear. Take a look and listen. That clunking sound is what I believe I'm hearing from inside the car when coming to a complete stop.

Any ideas???

[firefighter]

Is that whole thing moving because there's no load? Meaning it's not on the ground?

I'd start checking suspension bushings and links ect...

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[terryscott621]

That's kind of what I was thinking, that It's moving because there's no wheel on the hub. I'm not sure if it's supposed to love like that or not though.


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[BuildItYourSelf]

I'm gunna say that shouldn't move like that. It seems excessive. Not that it would cause a noise other then a clunking.

[terryscott621]

Ok. Poked around underneath and saw that the rear sway bar mounting bracket is broken on the drivers side (same side as in the video). I think that would account for some of the noise and movement. I guess I need to get in touch with BMR and order a new sway bar bracket.

[firefighter]

Ok. Poked around underneath and saw that the rear sway bar mounting bracket is broken on the drivers side (same side as in the video). I think that would account for some of the noise and movement. I guess I need to get in touch with BMR and order a new sway bar bracket.


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Yup... that'd be the issue. Glad you found something. I hate unidentified gremlins.

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[-Ray-]

Ok. Poked around underneath and saw that the rear sway bar mounting bracket is broken on the drivers side (same side as in the video). I think that would account for some of the noise and movement. I guess I need to get in touch with BMR and order a new sway bar bracket.

I hope to meet up with you when I get moved to San Antonio. I do have a welder but BMR should make that right.

[terryscott621]

Got the new rear sway bar bracket installed today. The bracket is actually a GM part and not from BMR. Luck had it that I had an extra one laying around from the last time one of the brackets broke on the passenger's side. Only problem is that I remembered this after buying two new ones (DOH!). Dealership wanted $28/side, but I was able to find them at gmpartsdirect.co (not .com) for $17 each plus $5 shipping so $40 total. Part #92191934 if anyone ever needs one.

Anyways, after I installed the new bracket the noise has completely gone away. YAY!!! My suspicion was that the sway bar was hitting against the spare tire well when coming to a complete stop and causing the noise I was hearing inside. The clearance is really close between these two items (maybe 1/4") The other groaning noises seemed to have disappeared also. While I was under there I backed off my sway bar stiffness to the medium setting, greased my rear sway bar bushings on both sides, and greased my BMR rear trailing arms.

So thanks for the all the help everyone (high fives all around). I really appreciate it. Lots of good suggestions from folks and I'm glad it only turned out to be a stupid broken bracket.

[donkeyGT]

Glad you got it sorted Terry. And thanks for the info.

[firefighter]

Nice... I like it when a story has a happy ending.

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