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Nasty squealing brake noise (possibly)

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EveryGoodNameWasTaken profile image

May 24, 2019, 1:02 PM

Post #1 of 2 (566 views)
  post locked   Nasty squealing brake noise (possibly)  

2002 Pontiac Bonneville SSEi. 3.8L v6 with 150k miles.

So, I've got some terrible noises that I strongly suspect are coming from the brakes. This car has been sitting in my shop for ages getting tons of work done but I just cannot track down this brake noise.

The best way to describe the noise is the sound and old box spring bed frame makes when doing the dirty... The noise does change in frequency (not so much pitch; you can clearly hear the oscilations) as the car's speed changes. The noise is gone with the car stopped. It is quite loud and can easily be heard with all windows up. It seems to only come from the front passenger wheel well now.***

***Update: the noise is now worse and you can no longer hear oscilations except at very low speeds. Its just a constant dissonant whine now. Pitch still does not change with speed, but is not present with the car stopped. There is no noise at all when moving in reverse, only forward.

Just for kicks, I put the front end up on jack stands and put it in drive to see if it still makes the noise while off the ground. It does but its much quieter and no longer a constant whine, but an oscilating squeak again. The sound is present and unchanged with or without pressure applied to the brakes so I cant be certain that its actually that system causing it.

The work I've done so far concerning the problem areas: New pads and rotors and calipers on all 4 wheels. I did grease all my pads (not the rotor side ofc) New lower control arms and ball joints. New tie rod ends and inner tie rod rubber guard things. New front and rear transmission mounts. New sway bar linkages. New rear air shocks.

Another point of note is that the car didnt have these sounds when I bought it about a month ago. It was only after extensive work to the front and rear suspension that the noises started so I have to assume it was something I did that caused it... but I dont know what. I've serviced dozens of brakes in the past with no issues like this.

The noises

Any ideas on how I might track this sucker down or ideas on what the problem may be? I really cant drive the car around like this.. Using a backup car in the interum.

P.S. I posted this question before with less detail but accidentally let the post die as I became very busy over the following days. I've deleted the old post now and am reposting in the proper channel with more details.

(This post was edited by EveryGoodNameWasTaken on May 24, 2019, 1:05 PM)

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 24, 2019, 3:18 PM

Post #2 of 2 (548 views)
  post locked   Re: Nasty squealing brake noise (possibly)  

C'mon sport, one thread for the same problem now worse. Keep up with the old one it's still there with questions to answer. I lock this one you can still view, copy and paste this on the original please, >> <<

(This post was edited by Tom Greenleaf on May 24, 2019, 3:21 PM)

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