I bought a 2010 LS460 and noticed a loud brake squealing noise coming from the front ( possibly driver side). Front rotors and pads were replaced but the noise remains. It only does it the first few times applying the brakes and goes away, and more profound if the car was sitting for longs periods of time. It is also more common in cold weather. I thought it was the left caliper and replaced it to no avail. I was reading that it could be moisture. Am I missing something?

 

Depending on where you live in high humidity like here in NC it happens to my lexus when it is not garaged and my tundra and wifes honda. Like you said the longer it sits the more probability that it will happen.

 

Sounds like that may be the issue then. Thanks

 

If it's been doing this in cold weather, you've had the car since at least March?? If it's really concerning, bring it to a shop for diagnosis. They can tell better in person than we can on a forum. That said, if it's only when you apply brakes, it's probably moisture rust.

 

yes, this march will be 2 years.
I've had the same mechanic shop change the brakes and rotors and now the caliper. I've told them each time of the squel and to see if they can find something..

 

It sounds like there's nothing to worry about after two years of this symptom.

 

true, it's more annoying than anything. But i will leave it alone now.

 

What brand & material pads are you running? I’ve been using Powerstop ceramic pads w/ zero noise & minimal dust for 7+ yrs.

Imperative to bed the pads too.

 

The noise going away when warm is of course exactly what should happen, but in general, brake squeal is usually caused by the pads vibrating in their calipers. I'd take off the brake pads and cover the back of them with the blue anti-squeal compound made for just this purpose (which from the description of things sounds like your mechanic did not apply this stuff). One of these comes in a rattle can and is called "Permatex 80077 Disc brake quiet" and that ought to do the trick.If it still squeals after all that, I think I'd turn or replace the rotors, since the only other factor involved is the rotor surface.

 

I would agree that it is probably moisture. Hose some water on the rotors andjust drive it ahead a little. If it is moisture, the squeal will be at its loudest now.

 

If you don't have them all make sure you install all the springs/clips etc, I use double "M" springs on my car to make sure it remains quiet.

 

Several members have pointed out errors in installation. There's a good chance this is the issue. Lack of lube and or improper clip placement will cause these issues as well. When I bought my 2013 used, the owner had it into the dealer for brake issues, new brakes on rear, and it still had them afterwards. I put new aftermarket rotors and pads on, broke them in carefully and they were then trouble free.

 

I don't remember the name of the pads and rotors, but I know that the pads are ceramic. I will admit that I didn't get the most expensive parts. And I don't think they bed the pads.

 

Update,

It was the brake hardware that was causing the noise.


Thank you all for the info.

 

My 2013 always does this at first then goes away ,Normal!