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We have a 2006 Buick Lacrosse. We just installed new front brakes. 2yr rotors and lifetime performance ceramic pads. We have used these pads in the past on the car and never experience this issue.

We first noticed an issue when making left turns. When turning there was a constant squeal that seemed to be coming from the front driver side wheel. Noise faded away when driving straight or turning left.

Noise does not seem to be directly correlated to braking and occurs when no braking is being performed.

After further investigation I noticed something that further confused me. When driving up and down the driveway I noticed that the front driver wheel made the noise when backing up, and the front passenger when driving forward.

I can best describe the noise as something like nails on a chalkboard. A constant high pitched squeal. Perhaps metal on metal.

Anybody have any ideas?

Pᴀᴜʟsᴛᴇʀ2
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denver
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2 Answers2

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I found what was causing the noise. There is a small metal plate, roughly sized and shaped like a one of those little wooden ice cream spoons that come with a Dixie cup. It is positioned suspending from the bottom of the hub parallel to the back of the rotor. On both sides of the car it was touching the rotor causing the noise.

enter image description here

On the driver side the front portion was touching, and on the passenger the back, which I suppose explains why it seemed to come from one side when backing up and the other when driving forward.

I have bent this plate back a little and the noise is gone.

So the question is what is this little plate for, and why was it suddenly scraping on both sides?

A picture is attached.

denver
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It looks almost like a rotor shield that was partiality form off Late GM models were known to have them intact a customer of mine had a 2009 Pontiac that had the same thing. We bent it back with a hammer and screw driver. Never heard the noise again

Craig
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